possible Ophrixus gracilis (water flea)

Images made through a microscope. All subject types.

Moderators: rjlittlefield, ChrisR, Chris S., Pau

NikonUser
Posts: 2676
Joined: Thu Sep 04, 2008 2:03 am
Location: southern New Brunswick, Canada

possible Ophrixus gracilis (water flea)

Post by NikonUser »

EDIT: danger of putting size on the image. The line label 0.18 mm should read 0.8 mm
EDIT2: title changed, was "Is this a Bosmina sp.?"
Thanks to Graham for a likely ID

Hoping for an ID at lest to Genus :)

Note the 2 long appendages pointing down from the head. These form an inverted V when seen from the front.
Oly 10x S Plan for full image; 20x S Plan Apo for the head; ZS PMax stacks
Image
Image
NUM10043 & NUM10044
Last edited by NikonUser on Sun Sep 12, 2010 9:30 am, edited 2 times 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.

Nikon camera, lenses and objectives
Olympus microscope and objectives

Mitch640
Posts: 2137
Joined: Sun Aug 15, 2010 1:43 pm

Post by Mitch640 »

I envy the clarity you are getting in your shots. This looks like a Tusked Bison, or maybe a cave painting of something that use to roam the plains of France. :)

verolet
Posts: 51
Joined: Thu Aug 24, 2006 11:52 am
Location: France

Post by verolet »

Hi
nice picture.
May be , It is a cladoceran wich belongs at the Macrothricidae.
Try to look at the genus Macrothrix but some other genus are also possible in this family.
Best regards
Michel

Mitch640
Posts: 2137
Joined: Sun Aug 15, 2010 1:43 pm

Post by Mitch640 »

Bosmina longirostris?

From this page

crobs808
Posts: 6
Joined: Thu Sep 09, 2010 7:29 pm
Location: Dallas, TX

Post by crobs808 »

BODY: Canon 5D OPTICS: 28-135 f/3.5, 50 f/1.8 II
No trees were harmed in the creation of this post; however,
a large number of electrons were terribly inconvenienced.

NikonUser
Posts: 2676
Joined: Thu Sep 04, 2008 2:03 am
Location: southern New Brunswick, Canada

Post by NikonUser »

Thanks everyone.

Michel: I checked the few images of Macrothrididae and Macrothrix
I could find on the WWW but none seemed to have a longtail spine.

Mitch: I don't think it's B. longirostris

Crobs808: not Daphnia magna; I don't think any of the Daphnia
have those elephant tusks as seen in this beast.
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

gpmatthews
Posts: 1040
Joined: Thu Aug 03, 2006 10:54 am
Location: Horsham, W. Sussex, UK
Contact:

Post by gpmatthews »

I have the FBA key to British freshwater Cladocera. The nearest I can find is fam. Macrothricidae, Ophrixus gracilis which is about the right size and general form, although only with a short spine. It may be that the photo is of a variant or similar species. The key comments that O. gracilis has two small caeca at the anterior end of the looped gut. Diagram is of female:

Image
Graham

Though we lean upon the same balustrade, the colours of the mountain are different.

NikonUser
Posts: 2676
Joined: Thu Sep 04, 2008 2:03 am
Location: southern New Brunswick, Canada

Post by NikonUser »

Thanks Graham. I could not much info on the WWW but found what appears to be a useful book and have ordered it:
"Ecology and classification of North American freshwater invertebrates-2nd edition
By James H. Thorp, Alan P. Covich."
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

Post Reply Previous topicNext topic