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Observ.

thebeachcomber

Fecha

Marzo 24, 2024 a las 09:00 MAÑANA AEDT

Fotos / Sonidos

Qué

Algas Verdes Primitivas (Clase Prasinophyceae)

Observ.

kenk

Fecha

Marzo 21, 2024 a las 04:16 TARDE PDT

Fotos / Sonidos

Observ.

nathanmayflower

Fecha

Marzo 25, 2024 a las 03:39 TARDE CDT

Fotos / Sonidos

Observ.

chandlerdavis

Fecha

Marzo 23, 2024 a las 01:06 TARDE CDT

Descripción

Bioblitz at Benbrook Lake

Fotos / Sonidos

Fecha

Marzo 26, 2024 a las 03:26 TARDE CET

Fotos / Sonidos

Observ.

someplant

Fecha

Marzo 26, 2024 a las 09:38 TARDE EDT

Descripción

Magnification of photos: 40×, 100×, 100×, 200×, 200×, 200×, 200×, 200×, 200×
Habitat: muddy water collected at the edge of The Lake in Central Park.
Photo taken with a Celestron PentaView Digital Microscope. According to their website, the FOV (i.e. the diagonal width) at 40× is 1.5 mm.

Fotos / Sonidos

Observ.

someplant

Fecha

Marzo 26, 2024 a las 09:43 TARDE EDT

Descripción

Magnification of photos: 200×, 200×, 400×, 400×, 600×, 600×, 600×
Habitat: muddy water collected at the edge of The Lake in Central Park.
Photo taken with a Celestron PentaView Digital Microscope. According to their website, the FOV (i.e. the diagonal width) at 200× is 300 µm.

Fotos / Sonidos

Observ.

someplant

Fecha

Marzo 26, 2024 a las 09:51 TARDE EDT

Descripción

Magnification of all photos: 600×
Habitat: muddy water collected at the edge of The Lake in Central Park.
Photo taken with a Celestron PentaView Digital Microscope. According to their website, the FOV (i.e. the diagonal width) at 600× is 100 µm.
Video available: https://youtu.be/wqjLlLdnVJ0

Fotos / Sonidos

Observ.

peptolab

Fecha

Febrero 11, 2024 a las 10:10 MAÑANA EST

Descripción

A marine cryptomonad, posssibly Pyrenomonas sp (the most accepted name, but some authors continue to use Rhodomonas), from a malodorous biofilm that formed on a sample of the superficial intertidal benthos of a new sampling site, a small beach near the boat basin at Moneybogue Bay in Westhampton Beach on the south shore of Long Island. Imaged in Nomarski DIC using Olympus BH2S under SPlan 100x oil objective with oiled condenser plus variable phone cropping on Samsung Galaxy S9+.
The cells measure 14 um in length. Two flagella emerge from a wide vestibulum. There is a furrow and a row of ejectosomes. There are numerous refractile bodies (? two Maupas bodies plus ?starch granules). I cannot discern the chloroplasts (1 or 2?) or the pyrenoid(s).

Fotos / Sonidos

Observ.

jimw3

Fecha

Marzo 27, 2024 a las 12:31 TARDE EDT

Fotos / Sonidos

Observ.

jimw3

Fecha

Marzo 27, 2024 a las 01:41 TARDE EDT

Fotos / Sonidos

Qué

Plantas con Flores (Subfilo Angiospermae)

Observ.

igorpyshnyi

Fecha

Marzo 27, 2024 a las 12:32 TARDE EET

Fotos / Sonidos

Observ.

ming110

Fecha

Enero 17, 2024 a las 10:09 MAÑANA CST

Fotos / Sonidos

Qué

Euglenas (Filo Euglenozoa)

Observ.

paul_dennehy

Fecha

Marzo 24, 2024 a las 10:20 MAÑANA EDT

Fotos / Sonidos

Qué

Ciliados (Filo Ciliophora)

Observ.

paul_dennehy

Fecha

Marzo 24, 2024 a las 10:20 MAÑANA EDT

Fotos / Sonidos

Observ.

miguel1958

Fecha

Marzo 25, 2024 a las 11:34 MAÑANA MST

Fotos / Sonidos

Qué

Algas Rojas (Filo Rhodophyta)

Observ.

sbushes

Fecha

Marzo 25, 2024 a las 03:54 TARDE GMT

Fotos / Sonidos

Qué

Algas Verdes (Filo Chlorophyta)

Observ.

gwark

Fecha

Marzo 21, 2024 a las 01:39 TARDE AKDT

Fotos / Sonidos

Observ.

andru_berrios

Fecha

Marzo 26, 2024 a las 11:07 MAÑANA -03

Fotos / Sonidos

Fecha

Marzo 9, 2024 a las 03:37 TARDE PST

Fotos / Sonidos

Observ.

cynodon

Fecha

Marzo 23, 2024 a las 04:07 TARDE CDT

Fotos / Sonidos

Observ.

plantoine

Fecha

Marzo 2024

Fotos / Sonidos

Observ.

wleurs

Fecha

Marzo 25, 2024 a las 11:48 MAÑANA CET

Fotos / Sonidos

Observ.

wleurs

Fecha

Marzo 25, 2024 a las 01:58 TARDE CET

Fotos / Sonidos

Observ.

marcriera

Fecha

Septiembre 26, 2020 a las 12:41 TARDE CEST

Fotos / Sonidos

Qué

Algas Verdes (Filo Chlorophyta)

Observ.

free2fish

Fecha

Marzo 26, 2024 a las 12:47 TARDE CDT

Descripción

31 um long

Fotos / Sonidos

Observ.

corndog

Fecha

Marzo 26, 2024 a las 01:04 TARDE PDT

Descripción

Seepy rock wall

Fotos / Sonidos

Qué

Cianobacterias (Filo Cyanobacteria)

Observ.

vireyajacquard

Fecha

Marzo 27, 2024 a las 09:53 MAÑANA AEDT

Descripción

Growing on the concrete floor of a greenhouse

Fotos / Sonidos

Observ.

algaholic

Fecha

Marzo 17, 2024 a las 12:13 TARDE +07

Fotos / Sonidos

Observ.

wleurs

Fecha

Marzo 25, 2024 a las 03:46 TARDE CET

Fotos / Sonidos

Observ.

kzoebel

Fecha

Marzo 25, 2024 a las 10:30 MAÑANA CDT
Plants

Fotos / Sonidos

Qué

Plantas (Reino Plantae)

Observ.

emptybucket

Fecha

Marzo 23, 2024 a las 12:46 TARDE AKDT

Fotos / Sonidos

Qué

Euglenas (Filo Euglenozoa)

Observ.

paul_dennehy

Fecha

Marzo 22, 2024 a las 03:41 TARDE EDT

Descripción

Peranema?

Fotos / Sonidos

Observ.

paul_dennehy

Fecha

Marzo 22, 2024 a las 03:41 TARDE EDT

Descripción

Maybe? Reddish eyespot, leaf-shaped cell, single flagellum

Fotos / Sonidos

Observ.

georgsh

Fecha

Julio 5, 2020 a las 04:32 TARDE CEST

Fotos / Sonidos

Observ.

dnorthouse211

Fecha

Marzo 26, 2024 a las 03:24 TARDE PDT

Fotos / Sonidos

Observ.

vriesea

Fecha

Marzo 24, 2024 a las 01:04 TARDE CDT

Fotos / Sonidos

Observ.

wleurs

Fecha

Marzo 25, 2024 a las 12:11 TARDE CET

Fotos / Sonidos

Observ.

gardatxanae

Fecha

Enero 28, 2024 a las 11:18 MAÑANA CET

Fotos / Sonidos

Fecha

Marzo 23, 2024 a las 02:02 TARDE WET

Descripción

syn. Isoetes velatum velatum

Fotos / Sonidos

Fecha

Septiembre 18, 2023 a las 01:23 TARDE PDT

Descripción

Strange aquatic plant that looks like a type of lichen , grows in a large, cold , slow stream .

Fotos / Sonidos

Observ.

golfopolikayakl

Fecha

Marzo 17, 2024 a las 06:11 TARDE CET

Descripción

intertidal

Fotos / Sonidos

Observ.

sylb

Fecha

Julio 6, 2023 a las 03:41 TARDE CEST

Fotos / Sonidos

Fecha

Julio 18, 2023 a las 03:54 TARDE MSK

Descripción

Video: https://youtu.be/FDWBotsaOSE
Sampling location: A water sample was collected from Istok Lake near the shore, where snags and aquatic vegetation were present.
Date and time of collection: 16 Jul 2023 at 3 PM
Date and time of observation: 18 Jul 2023 at 4 PM
The sample was stored at room temperature in a plastic container.

Single specimen.
The alga used a submerged piece of tree bark as a substrate.

Fotos / Sonidos

Observ.

sollar

Fecha

Marzo 24, 2024 a las 06:20 TARDE EET

Descripción

640x

Fotos / Sonidos

Observ.

lamawebber

Fecha

Julio 20, 2005 a las 04:08 TARDE PDT

Descripción

Species identified: Hobaniella longicrucris P.A.Sims & D.M.Williams, 2018 (previous name is O. longicrucris) (a monospecific genus)

Genus: Hobaniella P.A.Sims & D.M.Williams, 2018

Taxonomic notes on the genera: Hobaniella

Phylum: Bacillariophyta
Class: Bacillariophyta classisincertae sedis
Order: Bacillariophyta ordoincertae sedis
Family: Bacillariophyta familiaincertae sedis
Genus: Hobaniella (Guiry and Guiry 2024)

Type species, synonym(s), etc.: Holotype species: Hobaniella longicrucris (Greville) P.A.Sims & D.M.Williams

Genus summary:

Similar-looking diatoms of the Eupodiscaceae (e.g. Hobanellia, Odontella, Trieres, Zygoceros) and Biddulphiaceae (e.g. Biddulphia) can be approximately divided, morphologically and genetically, into two broad classifications: 1) ocellate and pseudocellate diatoms, respectively. The ocellus-bearing taxa (Eupodiscaceae) are monophyletic, and thus the ocellus is a useful morphological character in establishing the order Eupodiscaceae. However, the Biddulphiaceae are polyphyletic and dispersed across various lineages of multipolar non-pennate diatoms with a taxonomically confused history (Hoban 1983, Round et al. 1990, Ashworth et al. 2013). Previously, Biddulphioid diatoms included most of the Odontella species (Cupp 1943, Shim 1976, Tynni, R. 1986, Waters et al. 1992), including the taxa found in the Salish Sea; there still exists confusion regarding the naming of these two genera, partly because of the morphological variability of species such as O. aurita (Cupp 1943: 616-163). However, in the last twenty years, with molecular and SEM investigations, the taxonomy of ocelli- and pseudocelli-bearing diatoms and the taxonomy of Hobanellia and Odontella have become less ambiguous (Lavigne et al. 2015; Sims et al. 2018; Ashworth et al. 2013; Guiry and Guiry 2024).

Species:

Hobaniella longicrucris P.A.Sims & D.M.Williams, 2018 (basionym: Biddulphia longicruris Greville 1859: 163, pl. VIII [8]: fig. 10; previous name is O. longicrucris)
Description:
Valves broad elliptical-lanceolate. Length of apical axis 15–110μ. The valve face is convex with a prominent domed valve centre positioned between vertical long, narrow elevations with ocellus on each tip. Valve mantle steep, and at the base merging into an expanded hyaline valve margin. External rimoportulae tubular processes 1-3, situated at the apex of the domed valve center, usually long and slender, with rounded fork-like ends and slightly inflated at the base. Valve areolae radiating from a small hyaline central area, forming concentric ellipses on each half of the valve, in nearly parallel rows near base of valve mantle. Areolae on valve 12–17 in 10μ. Areolae occluded by a simple velum. Girdle zone with straight sides, with fine, parallel, vertical rows of pores 18–21 in 10μ. Girdle bands sometimes present, finely poroid 15–18 in 10μ, in vertical rows. Chloroplasts small, numerous, near the wall. Nucleus central. Cells joined into chains by ends of ocellus on valve elevations (Greville 1859: 163; Cupp 1943; Hasle and Syvertsen 1996; Sims et al. 2018. Guiry and Guiry 2024)

Salish Sea specimens: Hobaniella longicrucris-SHW-I-1036-2-July 20-2005_4.tif; Hobaniella longicrucris-SHW-I-1039-2-400x Dialux-July 20-2005_3.tif; Hobaniella longicrucris-SHW-I-s4700-July 14-2005_m007_3.tif; Hobaniella longicrucris-SHW-I-s4700-July 14-2005_m010_4.tif; Hobaniella longicrucris-SHW-Nov 10-2010_0014_4 copy.tif; Hobaniella longicrucris-SHW-Nov 10-2010_0003_4b.tif; Hobaniella longicrucris-SHW-I-s4700-July 14-2005_m004_4.tif.
Morphological data:
Valves broad elliptical-lanceolate. Length of apical axis 29.6-49.1 μm. The valve face is convex with a prominent domed valve centre positioned between vertical long, narrow elevations with ocellus on each tip. Valve mantle steep, and at the base merging into an expanded hyaline valve margin. External rimoportulae tubular processes 2, situated at the hyaline apex of the domed valve center, long and slender, with swollen fork-like tips and slightly inflated at the base. Valve areolae radiating from a small hyaline central area, forming concentric ellipses on each half of the valve, in nearly parallel rows near base of valve mantle. Areolae on valve 12 in 10μ. Girdle zone with straight sides, with fine, parallel, vertical rows of poroids 36 in 10μ. Girdle bands sometimes present, finely poroid, in vertical rows. Chloroplasts small, numerous, near the wall. Cells joined into chains by ends of ocellus on valve elevations.

Odontella_longicruris-SHW-2022, #161 RBCL 283, etc.: (100% 3e and 1e expect values, excellent distance tree results).

Odontella is cosmopolitan in the marine littoral, planktonic, epiphytic and benthic habitats. Odontella aurita (McIntire and Overton 1971, Tynni 1986, Sancetta and Calvert 1988); Hobaniella longicruris (Waters et al. 1992, Pienitz et al. 2003) and O. obtusa (Rao and Levin 1976, Shim 1976) are commonly found species within the Salish Sea and along the west coast of North America (Cupp 1943). These three species are frequently found in the plankton at Spanish Hills Wharf (SHW), Trincomali Channel, Galiano Isl. and occasionally in amongst epiphytes in the marine eelgrass Zostera marina at Montague Harbour Marine Provincial Park (MHMPP), Galiano Isl., BC, Canada.

From a plankton tow at Spanish Hills Wharf (SHW), Trincomali Channel, Galiano Island, BC, Canada, on July 14, 20, 2005. Live imaging with a Leitz Dialux and Nikon CoolPix 4500 camera. SEM imaging with a Hitachi s4700 at the BioImaging Facility, University of British Columbia. Thank Elaine Humphrey for SEM support.

References:

Ashworth, M. P., Nakov, T., & Theriot, E. C. (2013). Revisiting Ross and Sims (1971): toward a molecular phylogeny of the Biddulphiaceae and Eupodiscaceae (Bacillariophyceae). Journal of Phycology, 49(6), 1207–1222. https://doi.org/10.1111/JPY.12131

Guiry, M.D. in Guiry, M.D. & Guiry, G.M. 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 09 October, 2021.

Hasle, G.R. & Syvertsen, E.E. (1996). Marine diatoms. In: Identifying Marine Phytoplankton. (Tomas, C.R. Eds), pp. 5-385. San Diego: Academic Press.

Hoban, M.A. (1983). Biddulphioid diatoms II: The morphology and systematics of the Pseudocellate species, Biddulphia biddulphiana (Smith) Boyer, B. alternans (Bailey) Van Heurck, and Trigonium arcticum (Brightwell) Cleve. Botanica Marina, 26(6): 271-284

Hoppenrath, M., Elbrachter, M., Drebes, G. (2009) Marine Phytoplankton, Selected microphytoplankton species from the North Sea around Helgoland and Sylt. E. Schweizerbart’sche Verlagsbunchhandlung, Stuttgart, Germany.

Lavigne, A.S., Sunesen, I. & Sar, E.A. (2015). Morphological, taxonomic and nomenclatural analysis of species of Odontella, Trieres and Zygoceros (Triceratiaceae, Bacillariophyta) from Anegada Bay (Province of Buenos Aires, Argentina). Diatom Research 30(4): 307-331.

Pienitz, R., Fedje, D. and Poulin, M. (2003) Marine and Non-Marine Diatoms from the Haida Gwaii Archipelago and Surrounding Coasts, Northeastern Pacific, Canada In Bibliotheca Diatomologica (H. Lange-Bertalot and P. Kociolek, eds.), Band 48, J. Cramer, Stuttgart, 146 pp.

McIntire, C. D. and Overton, W. S. (1971). Distributional Patterns in Assemblages of Attached Diatoms from Yaquina Estuary, Oregon. Ecology, Vol. 52, No. 5. pp. 758-777.

Rao, V.N.R. and Levin, J. 1976. Benthic marine diatom flora of False Bay, San Juan Island, Washington. Syesis, 9:173–213.

Round, F.E., Crawford, R.M. and Mann, D.G. (1990), The Diatoms, Biology & Morphology of the Genera, pp. 220-221. Cambridge University Press, Cambridge, UK.

Sancetta, C. and Calvert, S. E. (1988). The annual cycle of sedimentation in Saanich inlet, British Columbia: implications for the interpretation of diatom fossil assemblages. Deep Sea Research Part A. Oceanographic Research Papers, 35(1), 71–90. doi:10.1016/0198-0149(88)90058-1

Shim, J. H. (1976). Distribution and Taxonomy of Planktonic Marine Diatoms in the Strait of Georgia, B.C. Phd. Thesis, UBC.

Sims, P.A. (ed.) (1996). An atlas of British diatoms arranged by B. Hartley based on illustrations by H.G. Barber and J.R. Carter. pp. 406-409, Bristol: Biopress Ltd.

Sims, P. A., Williams, D. and Ashworth, M. P. (2018). Examination of type specimens for the genera Odontella and Zygoceros (Bacillariophyceae) with evidence for the new family Odontellaceae and a description of three new genera. Phytotaxa 382(1):1. DOI: 10.11646/phytotaxa.382.1.1

Spaulding, S.A., Bishop, I.W., Edlund, M.B., Lee, S., Furey, P., Jovanovska, E. and Potapova, M. Diatoms of North America. Retrieved November 6, 2021, from https://diatoms.org

Tynni, R. (1986). Observations of diatoms on the coast of the State of Washington. Geological Survey of Finland. Report of Investigation 75

Waters, R. E., Brown, L.N., and MG Robinson, M.G. (1992). Phytoplankton of Esquimalt Lagoon, British Columbia: comparison with west Vancouver Island coastal and offshore waters. Canadian Technical Report of Hydrography Ocean Sciences 137.

Fotos / Sonidos

Observ.

jeffdc

Fecha

Marzo 17, 2024 a las 05:11 TARDE EDT

Fotos / Sonidos

Observ.

joergfreyhof

Fecha

Julio 29, 2013 a las 12:55 MAÑANA CEST

Fotos / Sonidos

Observ.

mykolakerb

Fecha

Marzo 4, 2024

Fotos / Sonidos

Qué

Algas Verdes (Filo Chlorophyta)

Observ.

cf125

Fecha

Marzo 24, 2024 a las 09:38 MAÑANA GMT

Descripción

On the Thames embankment wall

Fotos / Sonidos

Observ.

paolapalazzolo

Fecha

Marzo 24, 2024 a las 01:41 TARDE CET

Fotos / Sonidos

Observ.

kristin_steed

Fecha

Marzo 24, 2024 a las 09:18 MAÑANA CDT

Fotos / Sonidos

Observ.

wleurs

Fecha

Marzo 9, 2024 a las 10:32 MAÑANA CET

Fotos / Sonidos

Observ.

mogug

Fecha

Marzo 23, 2024 a las 05:30 TARDE CET

Fotos / Sonidos

Observ.

wleurs

Fecha

Marzo 9, 2024 a las 03:49 TARDE CET

Fotos / Sonidos

Qué

Algas Verdes (Filo Chlorophyta)

Observ.

zanethebrain

Fecha

Marzo 17, 2024 a las 10:19 MAÑANA PDT

Descripción

Terrestrial, on log near seep music to moist filtered light. Growing with small liverwort, Cephalozia.

Fotos / Sonidos

Qué

Najas (Género Najas)

Observ.

aerobird

Fecha

Marzo 21, 2024 a las 08:59 MAÑANA CST

Fotos / Sonidos

Observ.

darkraptor

Fecha

Septiembre 18, 2022 a las 07:57 MAÑANA CEST

Fotos / Sonidos

Observ.

davidfbird

Fecha

Marzo 12, 2024 a las 01:04 TARDE EDT

Descripción

From a meltwater pond on a grassy trail. Length 35 microns. Two unequal flagella, no visible ingestion tools. The second and third gifs show its attempt to ingest a diatom, without success. When I came back later, a large diatom had successfully been consumed (2nd jpg and 4th gif).

Fotos / Sonidos

Observ.

invertebratist

Fecha

Noviembre 30, 2023 a las 05:38 TARDE NZDT

Descripción

Native Podocarp-broadleaved bush, at night.

Fotos / Sonidos

Observ.

kryxmac

Fecha

Marzo 11, 2024 a las 07:33 TARDE PDT

Descripción

Water sample taken from river in Bullhead City, Arizona on 3/9/24

Fotos / Sonidos

Observ.

tsveta

Fecha

Marzo 21, 2024 a las 01:49 TARDE EET

Lugar

Tatlısu (Google, OSM)

Fotos / Sonidos

Observ.

free2fish

Fecha

Marzo 22, 2024 a las 11:33 MAÑANA CDT

Descripción

14 to 21 um long about 3 um wide

Fotos / Sonidos

Observ.

asterochloris

Fecha

Marzo 13, 2024 a las 12:20 TARDE +07

Fotos / Sonidos

Observ.

wleurs

Fecha

Marzo 9, 2024 a las 01:46 TARDE CET

Fotos / Sonidos

Observ.

wleurs

Fecha

Marzo 9, 2024 a las 03:37 TARDE CET

Fotos / Sonidos

Observ.

rob_palmer

Fecha

Marzo 22, 2024 a las 08:54 MAÑANA SAST

Fotos / Sonidos

Observ.

pyakai

Fecha

Septiembre 5, 2023 a las 07:38 TARDE +07

Fotos / Sonidos

Observ.

dwirtala

Fecha

Abril 22, 2023 a las 03:02 TARDE PDT

Descripción

on stagnant bucket of water

Fotos / Sonidos

Observ.

algaholic

Fecha

Marzo 17, 2024 a las 12:23 TARDE +07

Fotos / Sonidos

Observ.

lamawebber

Fecha

Marzo 7, 2021 a las 09:14 TARDE PST

Descripción

Species Identified:

Odontella obtusa Kützing 1844.

Genus: Odontella (Lyngbye) C.Agardh

Taxonomic notes on the genera: Odontella

Phyllum: Bacillariophyta
Subphylum: Bacillariophytina
Class: Mediophyceae
Subclass: Thalassiosirophycidae
Order: Eupodiscales
Family: Odontellaceae
Genus: Odontella (Guiry and Guiry 2024)

Type species, synonym(s), etc.: Holotype species: Odontella aurita (Lyngbye) C.Agardh (homotypic synonym: Biddulphia aurita (Lyngbye) Brebisson 1838)

Genus summary:

Similar-looking diatoms of the Eupodiscaceae (e.g. Hobanellia, Odontella, Trieres, Zygoceros) and Biddulphiaceae (e.g. Biddulphia) can be approximately divided, morphologically and genetically, into two broad classifications: 1) ocellate and pseudocellate diatoms, respectively. The ocellus-bearing taxa (Eupodiscaceae) are monophyletic, and thus the ocellus is a useful morphological character in establishing the order Eupodiscaceae. However, the Biddulphiaceae are polyphyletic and dispersed across various lineages of multipolar non-pennate diatoms with a taxonomically confused history (Hoban 1983, Round et al. 1990, Ashworth et al. 2013). Previously, Biddulphioid diatoms included most of the Odontella species (Cupp 1943, Shim 1976, Tynni, R. 1986, Waters et al. 1992), including the taxa found in the Salish Sea; there still exists confusion regarding the naming of these two genera, partly because of the morphological variability of species such as O. aurita (Cupp 1943: 616-163). However, in the last twenty years, with molecular and SEM investigations, the taxonomy of ocelli- and pseudocelli-bearing diatoms and the taxonomy of Odontella have become less ambiguous (Lavigne et al. 2015, Sims et al. 2018, Ashworth et al. 2013). See a detailed genus description in Guiry and Guiry (2024).

Odontella is cosmopolitan in the marine littoral, planktonic, epiphytic and benthic habitats.

Summary of Odontella genus characteristics:

  1. Valves elliptical or lanceolate (bipolar).
  2. An elevation (horn) with an ocellus at each pole.
  3. Cells in straight (united by both elevations) or in zigzag chains (united by one elevation).
  4. Two or more labiate process per valve, usually with long external tubes (O. obtusa lack long external tubes).
  5. Numerous small chloroplasts lying against valve wall (Hasle & Syvertsen 1996: 238)

Species:

Odontella obtusa Kützing 1844 p. 137, pl. 18, fig. VIII, 1–3, 6–8 (Syn: Biddulphia obtusa (Kützing; ) Ralfs in Pritchard; Odontella aurita var. obtusa (Kützing) Denys, 1982)

Description:
Heavily silicified cells, appears similar to O. aurita. However, in O. obtusa, the two obtuse elevations are shorter than O. aurita. Elevations often the same height or slightly higher than the central convexity. And the elevations are more divergent. Odonetlla obtusa has inconspicuous rimoportula exits with short flanges, lacking distinctive long, thin tubular processes found in O. aurita. Length along apical axis 24–80 μm. Areolae 8–10 in 10μm on valve in radiating rows; 7–8 on girdle in 6 pervalvar rows in 10μm. Exhibits variations in morphology.
(Kützing 1844; Cupp 1943; Hendey 1964; Hoppenrath et al. 2009; Lavigne et al. 2015; Guiry and Guiry 2024

Salish Sea specimens: Odontella cf. obtusa and Amphora on Zostra m-Monta H Beach-(July 20-2020)-TM4000-Aug 3-2020_02(x1.2k)_4.tif; Odontella obtusa Stub 6-Zm-enviro-sections-Nov 15-20-MHHPP (x1K) AMF-Dec 29-2020_4_3.tif; Odontella obtusa-Zm MHMPP_Mar 7-2021_Box 9 stub 46 Pa_HM_2a(x1.0k)_4 copy.jpg; Odontella and Tabularia on Z marina-Mar 7-2021-M leaf E800 40x dry-MU2003-Mar 9c-2021-0130_3.tif; Odontella obtusa-Stub 6-Zm-enviro-sections-Nov 15-20-MHHPP (x400)AMF-Dec 29-2020_2.tif; Odontella obtusa-Zm MHMPP-BOX 1B T32 4 B (Mar 7-2024) (MQ)_m006_4.tif.
Morphological data:
Heavily silicified cells, they appear similar to O. aurita. O. obtusa, generally with two obtuse elevations that are shorter than O. aurita, often the same height or slightly higher than the central convexity. And the elevations are generally more divergent. Odonetlla obtusa has inconspicuous rimoportula exits with short flanges, lacking the distinctive long, thin tubular processes of O. aurita. Length along apical axis 30-38.3 µm. Valve areolae 10-16 in 10 μm on valve in radiating rows. Valvocopula 10-14 poroids in a 10 µm pervalvar row. Poroid density changes away from the valvocopula. Shows variations in morphology.

Odontella obtusa (Cupp 1943, Rao and Levin 1976, Shim 1976) appears to be a common diatom within the Salish Sea and along the west coast of North America. Odontella obtusa is frequently found in the plankton at Spanish Hills Wharf (SHW), Trincomali Channel, Galiano Island, BC, Canada and less frequently found as epiphytes in the marine eelgrass Zostera marina at Montague Harbour Marine Provincial Park (MHMPP), Galiano Island.

Methods:

Found on Z. marina leaves. Collected at Montague Harbour Marine Provincial Park (MHMPP), Galiano Island, BC, Canada, Aug. 4, 2020, November 15, 2020 (LM) and March 7, 2021.
Diatoms were collected by brushing or making razor blade scrapings of proximal, medial and distal sections. Additionally, 8-10 mm preserved leaf sections were cleaned with concentrated hydrogen peroxide or nitric acid at 100 C for 3-5 hours to remove organics, then rinsed multiple times in ddH20 to a neutral pH. Mounted on SEM stubs or in Naphrax on slides for light microscopy. Imaging with a Nikon TE300 and Tuscen DigiRetna16 MP camera or Nikon E800.
Live specimens were imaged with either a Nikon TE300 or Nikon E800 with either bright-field or DIC. In-situ, environmentally prepared samples were made using minimal contact of 8-10 mm leaf section, soaked in ddH2O to remove salts and dried through an EtOH series (50%-100%) and finished off with 100% Hexamethyldisilane HMDS (Hazrin-Chong and Manefield 2012). Mounted on carbon stickies onto aluminum SEM stubs and imaged with either the Hitachi s4800 or TM4000 at AMF, at University of Victoria, B.C. My thanks to Siobhan Schenk and Laura Parfrey in the Parfrey Lab at UBC for molecular data from the eelgrass and collaboration with IMERSS. Also, thanks go to Elaine Humphrey of the AMF, UVIC, imaging by Ron Read, Melanie Quenneville and Arjan van Asselt. Preparation, additional imaging, taxonomy and identifications by Mark Webber.

References:

An, S.M.; Cho, K.; Kim, E.S.; Ki, H.; Choi, G.; Kang, N.S. (2023). Description and Characterization of the Odontella aurita OAOSH22, a Marine Diatom Rich in Eicosapentaenoic Acid and Fucoxanthin, Isolated from Osan Harbor, Korea. Mar. Drugs, 21,563. https://doi.org/10.3390/md21110563

Ashworth, M. P., Nakov, T., and Theriot, E. C. (2013). Revisiting Ross and Sims (1971): toward a molecular phylogeny of the Biddulphiaceae and Eupodiscaceae (Bacillariophyceae). Journal of Phycology, 49(6), 1207–1222. https://doi.org/10.1111/JPY.12131

Bérard-Therriault, L., Poulin, M. & Bossé, L. (1999). Guide d'identification du phytoplancton marin de l'estuaire et du Golfe du Saint-Laurent incluant également certains protozoaires. Publication Spéciale Canadienne des Sciences Halieutiques et Aquatiques 128: 1-387.

BOLD Systems: Taxonomy Browser - Odontella aurita {species} (February 13, 2021. https://v3.boldsystems.org/index.php/Taxbrowser_Taxonpage?taxid=87619, http://www.boldsystems.org/index.php/Public_RecordView?processid=DITS121-08

Cupp, E. E. (1943). Marine Plankton Diatoms of the West Coast of North America. Bull. Scrips. Inst. Oceanography. 5: 1-238.

Guiry, M.D. in Guiry, M.D. & Guiry, G.M. 2024. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on March 15, 2024.

Hasle, G.R. & Syvertsen, E.E. (1996). Marine diatoms. In: Identifying Marine Phytoplankton. (Tomas, C.R. Eds), pp. 5-385. San Diego: Academic Press.

Hazrin-Chong NH, Manefield M. (2012 ). An alternative SEM drying method using hexamethyldisilazane (HMDS) for microbial cell attachment studies on sub-bituminous coal. J Microbiol Methods. 90(2):96-9. doi: 10.1016/j.mimet.2012.04.014.

Hendey, N.I. (1964). An introductory account of the smaller algae of British coastal waters. Part V: Bacillariophyceae (diatoms). pp. [i]-xxii, 1-317. London: Ministry of Agriculture, Fisheries and Food, Fishery Investigations. Her Majesty’s Stationery Office.

Hoban, M.A. (1983). Biddulphioid diatoms II: The morphology and systematics of the Pseudocellate species, Biddulphia biddulphiana (Smith) Boyer, B. alternans (Bailey) Van Heurck, and Trigonium arcticum (Brightwell) Cleve. Botanica Marina, 26(6): 271-284

Hoppenrath, M., Elbrachter, M., Drebes, G. (2009) Marine Phytoplankton, Selected microphytoplankton species from the North Sea around Helgoland and Sylt. E. Schweizerbart’sche Verlagsbunchhandlung, Stuttgart, Germany.

Kützing, F.T. (1844). Die Kieselschaligen Bacillarien oder Diatomeen. pp. [i-vii], [1]-152, pls 1-30. Nordhausen: zu finden bei W. Köhne.

Lavigne, A.S., Sunesen, I. & Sar, E.A. (2015). Morphological, taxonomic and nomenclatural analysis of species of Odontella, Trieres and Zygoceros (Triceratiaceae, Bacillariophyta) from Anegada Bay (Province of Buenos Aires, Argentina). Diatom Research 30(4): 307-331.

Pienitz, R., Fedje, D. and Poulin, M. (2003) Marine and Non-Marine Diatoms from the Haida Gwaii Archipelago and Surrounding Coasts, Northeastern Pacific, Canada In Bibliotheca Diatomologica (H. Lange-Bertalot and P. Kociolek, eds.), Band 48, J. Cramer, Stuttgart, 146 pp.

McIntire, C. D. and Overton, W. S. (1971). Distributional Patterns in Assemblages of Attached Diatoms from Yaquina Estuary, Oregon. Ecology, Vol. 52, No. 5. pp. 758-777.

Rao, V.N.R. and Levin, J. 1976. Benthic marine diatom flora of False Bay, San Juan Island, Washington. Syesis, 9:173–213.

Round, F.E., Crawford, R.M. and Mann, D.G. (1990), The Diatoms, Biology & Morphology of the Genera, pp. 220-221. Cambridge University Press, Cambridge, UK.

Sancetta, C. and Calvert, S. E. (1988). The annual cycle of sedimentation in Saanich inlet, British Columbia: implications for the interpretation of diatom fossil assemblages. Deep Sea Research Part A. Oceanographic Research Papers, 35(1), 71–90. doi:10.1016/0198-0149(88)90058-1

Shim, J. H. (1976). Distribution and Taxonomy of Planktonic Marine Diatoms in the Strait of Georgia, B.C. Phd. Thesis, UBC.

Sims, P.A. (ed.) (1996). An atlas of British diatoms arranged by B. Hartley based on illustrations by H.G. Barber and J.R. Carter. pp. 406-409, Bristol: Biopress Ltd.

Sims, P. A., Williams, D. and Ashworth, M. P. (2018). Examination of type specimens for the genera Odontella and Zygoceros (Bacillariophyceae) with evidence for the new family Odontellaceae and a description of three new genera. Phytotaxa 382(1):1. DOI: 10.11646/phytotaxa.382.1.1

Spaulding, S.A., Bishop, I.W., Edlund, M.B., Lee, S., Furey, P., Jovanovska, E. and Potapova, M. Diatoms of North America. Retrieved November 6, 2021, from https://diatoms.org

Tynni, R. (1986). Observations of diatoms on the coast of the State of Washington. Geological Survey of Finland. Report of Investigation 75

Waters, R. E., Brown, L.N., and MG Robinson, M.G. (1992). Phytoplankton of Esquimalt Lagoon, British Columbia: comparison with west Vancouver Island coastal and offshore waters. Canadian Technical Report of Hydrography Ocean Sciences 137.

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swimjamie

Fecha

Marzo 22, 2024 a las 02:53 TARDE GMT

Descripción

On Yew, Taxus baccata. Hitherto, I have only encountered this alga on Hedera (Ivy) leaves. Habitat: predominantly Fagus, with some conifer.
See Guiry The genus Phycopeltis (Trentepohliaceae, Chlorophyta) in Ireland: A taxonomic and distributional reassessment

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Riverbed

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danner_foust

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Marzo 22, 2024 a las 02:16 TARDE CDT

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baptiste_plana

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Marzo 22, 2024 a las 11:16 MAÑANA CET

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bnm50

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Marzo 22, 2024 a las 12:28 TARDE CDT

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asterochloris

Fecha

Marzo 13, 2024 a las 11:13 MAÑANA +07

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asterochloris

Fecha

Marzo 22, 2024 a las 01:16 TARDE +07

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bclarkston

Fecha

Marzo 19, 2024 a las 12:28 TARDE PDT

Descripción

From Lake Louise, Bellingham.
From leaf litter in about 30cm of water at the lake's edge.

Under 400x magnification (compound light microscope).

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ongzi

Fecha

Marzo 20, 2024 a las 10:53 MAÑANA +08

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Mayo 6, 2022 a las 01:14 TARDE BST

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Abril 16, 2022 a las 08:09 MAÑANA CEST

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Fecha

Marzo 20, 2024 a las 03:48 TARDE GMT

Descripción

In sample from margin of turlough (winter lake)

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Descripción

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Algas Verdes (Filo Chlorophyta)

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Octubre 27, 2023 a las 03:42 TARDE SAST

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Fecha

Marzo 16, 2024 a las 07:26 TARDE EDT

Descripción

Magnification of photos: 400×, 600×, 600×, 400×, 600×
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Photo taken with a Celestron PentaView Digital Microscope. According to their website, the FOV (i.e. the diagonal width) at 400× is 150 µm.

Plants

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Plantas (Reino Plantae)

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lu-wei

Fecha

Marzo 14, 2024 a las 09:52 MAÑANA AEDT

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jvanweenen

Fecha

Marzo 19, 2024 a las 05:46 TARDE ACDT

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markod

Fecha

Marzo 17, 2024 a las 09:28 MAÑANA CET

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Marzo 18, 2024 a las 11:05 MAÑANA CDT

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Julio 22, 2013 a las 04:18 TARDE CEST

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alexcm

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alexcm

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Julio 25, 2013 a las 10:15 MAÑANA CEST

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frangcast

Fecha

Marzo 19, 2024 a las 10:27 MAÑANA CET

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Fecha

Marzo 17, 2024 a las 09:41 MAÑANA CDT

Descripción

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davidfbird

Fecha

Marzo 12, 2024 a las 12:55 TARDE EDT

Descripción

About 30 µm long. From a vernal pond on the escarpment. I've put a one-minute video of this cell consuming a small green-algal cell using the rod-organ, here: https://www.facebook.com/100070304167055/videos/1064414261681441.

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