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Crustacean id

 
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GaryB



Joined: 29 Jul 2016
Posts: 521

PostPosted: Thu Feb 15, 2018 7:16 am    Post subject: Crustacean id Reply with quote

I found this little fellow trapped under some detritus I picked up at the sea. It slowly wriggled into view and was struggling to free itself. I don't know what it is but made a video here if anyone can id it.

Zeiss F-LD 20x/.25 LWD, with a mix of oblique and darkfield via homemade lucigen condenser

https://www.youtube.com/watch?v=qT-a4yzAsBs

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WalterD



Joined: 06 Jul 2015
Posts: 368
Location: Rotterdam, the Netherlands

PostPosted: Sun Feb 18, 2018 12:30 am    Post subject: Reply with quote

Nice, thanks for sharing!
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eward1897



Joined: 19 Feb 2018
Posts: 11
Location: Minnesota, US

PostPosted: Mon Feb 19, 2018 11:26 am    Post subject: propabable nauplius Reply with quote

I think your little crustacean is a nauplius larva. Crustaceans (and most arthropods) go through drastic changes as they go from egg to adult. Several different classes of crustaceans that look very different as adults have one-eyed free-swimming larva that look rather similar.

Your nauplius looks like a baby copepod (like Cyclops spp.) to me. Ostracods (so called seed shrimp) also have a nauplius stage, but like the adult the carapace (main 'shell') looks clam like in their larva. There is a brief "Key for the identification of crustacean nauplii" (= plural term for nauplius) at sciencedirect.com/science/article/pii/S1439609205000760 The text is directed towards professional biologists but Figure 2 shows good drawings of the nauplii of some different crustacean groups.

The study of nauplius larva probably had a role in the development of the theory of evolution. Charles Darwin studied the larval development of barnacles around the time it was being figured out what nauplii were. Some larval crustaceans were initially thought to be new species since they look so different from the adults. Watching the development of barnacles through different stages (barnacles have free-swimming nauplius larva and become strange, glued in place adults) could have prompted Darwin to think about how organisms may give rise to new species over time. Darwin pointed out how embryos are more alike than adults of different vertebrates in The Origin of the Species. It was the great German biologist-philosopher-artist Ernst Haeckel who put the idea so succinctly as "ontogeny recapitulates phylogeny."
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ChrisR
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Joined: 14 Mar 2009
Posts: 7787
Location: Near London, UK

PostPosted: Mon Feb 19, 2018 4:12 pm    Post subject: Reply with quote

Welcome to the forum Eward!
Splendid first post (which will cost me some time on Wikipedia) Very Happy
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GaryB



Joined: 29 Jul 2016
Posts: 521

PostPosted: Mon Feb 19, 2018 4:56 pm    Post subject: Reply with quote

Wow, great reply. Thank you, and welcome to the forum!

Like Chris, I'll have to spend some time researching these guys. I found it in the Puget sound and it's the first of it's kind I've come across. Unfortunately, as soon as it freed itself in the video, it went straight back to the exact spot it escaped from and was trapped all over again Confused I guess that's where the food was..
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