Exuviae

Today I returned to the Cannon River to look for emerging clubtails and search for exuviae. Unfortunately a thorough search was out of the question as I had less than a half hour, so I focused on the sandy spit of land upstream of the tributary Spring Creek.

Exuviae are the cast of exoskeletons left behind after dragonflies emerge. Because they are solid, they retain the exact shape of the full grown nymph, a kind of death mask for that previous stage of life. There is a hole in each exuvia located behind the head and between the wing pads where the adult dragonfly made its escape, literally crawling out of itself. The white threads often seen dangling from this exit hole are the tracheal tubes.

There are a number of good reasons to pay attention to exuviae. Presence of exuviae prove the existence of breeding populations. Daily monitoring and collection of exuviae can provide the date for emergence periods and population estimates. Often the exuviae can be identified to species and in some instances can provide records for very elusive adults.

Publicado por scottking scottking, 07 de junio de 2017

Observaciones

Fotos / Sonidos

Observ.

scottking

Fecha

Junio 6, 2017 09:04 AM CDT

Descripción

Cobra Clubtail, teneral female
Cannon River
Cowling Arboretum
Northfield, Minnesota

Fotos / Sonidos

Observ.

scottking

Fecha

Junio 6, 2017 09:28 AM CDT

Descripción

Cobra Clubtail, male
Cannon River
Cowling Arboretum
Northfield, Minnesota

Fotos / Sonidos

Observ.

scottking

Fecha

Junio 6, 2017 09:28 AM CDT

Descripción

Cobra Clubtail. female
Cannon River
Cowling Arboretum
Northfield, Minnesota

Fotos / Sonidos

Observ.

scottking

Fecha

Junio 6, 2017 02:37 PM CDT

Descripción

Cobra Clubtail, exuvia
Cannon River
Cowling Arboretum
Northfield, Minnesota

Comentarios

Hi Scott! I'm currently in Voyageurs National Park and I've just spent the morning photographing emerging four spotted skimmers, chalk fronted corporals, and some other clubtail I haven't identified yet. Lots of exuviae here. Are you interested in any from this area or are you just concentrating on Rice and Dakota counties? If so, I will collect a sampling.

Publicado por figaro hace alrededor de 5 años (Marca)

Janet, I'd be delighted to see some exuviae from up north. Enjoy your trip. And I'll look forward to seeing the photos of the emerging dragonflies.

Publicado por scottking hace alrededor de 5 años (Marca)

Thanks for helping to educate folks about exuviae and dragonflies.

Publicado por toddfolsom hace alrededor de 5 años (Marca)

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