Observaciones de michaelp36

Probably the common mussel - Mytilus edulis.

Perhaps this is spawn of some marine invertebrate (or stranded jellyfish?). Interestingly, the system does not allow to select "invertebrates" from the list of organisms.

Probably a disintegrating jellyfish, though it did not look like A. aurata. Perhaps it's something else.

Meoma ventricosa?? I could be completely off with this ID. Regardless, I think that this is test covered with a thin layer of algae, i.e., the spine-like structures are probably algae.

My initial thought was "sand lances", but those do not occur in the Bahamas. Perhaps silversides?

Probably Diploria strigosa.

Probably a comb jelly, although cilia rows are not prominent.

Probably Sympetrum obtrusum; female.

Enallagma sp.? Female.

Identified as Argia cf. tibialis on BugNet. I would be interesting to hear opinions on its identity.

Tube sponges. Family/species???

Perhaps Cribrochalina sp.?

Encrusting sponge; perhaps Cribrochalina sp.

Perhaps Xestospongia, but very atypical osculum; perhaps they do not form "barrel" at lesser depths??

Probably Spongilla lacustris; in a shallow river.

Hiding next to a fully grown Diadema antillarum (see next photo). Interestingly, iNaturalist identified it as "Common Hedgehog"!

Some small marbled crab. I could not find it in field guides.

Sargassum sp.

Some species of brown algae.

A shrub or small tree of the Fabaceae.

I am guessing these are mackerel scads (black spot at the edge of gill plate). Frames from a video.