Sida crystallina - a large Cladoceran

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NikonUser
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Location: southern New Brunswick, Canada

Sida crystallina - a large Cladoceran

Post by NikonUser »

Edit: Title changed; thanks to Betty for positive ID.
Sorry for keep asking for identifications, I try the WWW and when I come up blank I rely of the knowledge and kindness of PMG.net. I've ordered a book on the FW invertebrates on NA and hopefully this will allow me to ID my catches, at least to genus.
From today's pond dipping:
Image
Image
Image
NUM10050
Last edited by NikonUser on Wed Sep 15, 2010 5:41 pm, edited 1 time in total.
NU.
student of entomology
Quote – Holmes on ‘Entomology’
” I suppose you are an entomologist ? “
” Not quite so ambitious as that, sir. I should like to put my eyes on the individual entitled to that name.
No man can be truly called an entomologist,
sir; the subject is too vast for any single human intelligence to grasp.”
Oliver Wendell Holmes, Sr
The Poet at the Breakfast Table.

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Mitch640
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Post by Mitch640 »

Amazing. It looks like it has a backbone and rib cage. Beautiful images.

ABEL
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Post by ABEL »

Beautiful images in clear field ¡

Is it possible that it is alona?

NikonUser
Posts: 2688
Joined: Thu Sep 04, 2008 2:03 am
Location: southern New Brunswick, Canada

Post by NikonUser »

Thanks Mitch. Of course I'm guessing it's a water flea (Cladocera) but all the others I have seen are rounded with a curved gut; this character is elongtaed with a straight gut

Abel: Thanks, all the images I could find on the WWW for alona show rounded species with convoluted guts.
NU.
student of entomology
Quote – Holmes on ‘Entomology’
” I suppose you are an entomologist ? “
” Not quite so ambitious as that, sir. I should like to put my eyes on the individual entitled to that name.
No man can be truly called an entomologist,
sir; the subject is too vast for any single human intelligence to grasp.”
Oliver Wendell Holmes, Sr
The Poet at the Breakfast Table.

Nikon camera, lenses and objectives
Olympus microscope and objectives

Charles Krebs
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Location: Issaquah, WA USA
Contact:

Post by Charles Krebs »

Really nice brightfield images!

Planapo
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Joined: Tue Nov 07, 2006 2:33 am
Location: Germany, in the United States of Europe

Post by Planapo »

I like the last photo very much!

This cladoceran reminds me of Sida cristallina that is quite common over here. So it might be this species/genus or some other cladoceran within the Sididae. (?)

And one should bear in mind that (in cladocerans) there can be quite a variation (of morphology) within one and the same species depending on given environmental conditions. Keyword: ecotype.

Hope my digging in some faint memories helps with your further ID.

--Betty

NikonUser
Posts: 2688
Joined: Thu Sep 04, 2008 2:03 am
Location: southern New Brunswick, Canada

Post by NikonUser »

Many thanks Betty; great memory.
Looks like you are 100% correct. Seems the Americans spell it crystallina but Google finds it either way.
Really impressed, so thanks again
NU.
student of entomology
Quote – Holmes on ‘Entomology’
” I suppose you are an entomologist ? “
” Not quite so ambitious as that, sir. I should like to put my eyes on the individual entitled to that name.
No man can be truly called an entomologist,
sir; the subject is too vast for any single human intelligence to grasp.”
Oliver Wendell Holmes, Sr
The Poet at the Breakfast Table.

Nikon camera, lenses and objectives
Olympus microscope and objectives

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