All the same specimen from my garden pond - is this O. fallax?. First three:
Microscope: Leitz Dialux
Objective: Leitz 40/0.70 NPL Fluotar ICT
Ocular: Zeiss KPL 8
DIC
Sample from garden pond, Dec 2017
Camera: Canon EOS 500D. Flash via fibre optic feed
Next two:
Microscope: Zeiss Standard
Objective: Zeiss 40/0.65 Ph2
Ocular: Zeiss KPL 8..
Phase contrast
Sample from garden pond, Dec 2017
Camera: Canon EOS 500D. Flash via fibre optic feed
Oxytricha sp (O. fallax?)
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Oxytricha sp (O. fallax?)
Graham
Though we lean upon the same balustrade, the colours of the mountain are different.
Though we lean upon the same balustrade, the colours of the mountain are different.
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Wow, really nice! You've done a wonderful job of showing all 18 cirri in the "oxytrichid" pattern, in that first image.
I think it's reasonable to place this guy in the O. fallax species complex.
The group of three postoral ventral cirri (just posterior of the mouth) is pretty tight, whereas in Sterkiella (the other candidate genus, here) the posterior one tends to be isolated. Also, the transverse cirri (the big ones at the posterior of the cell) don't protrude beyond the margins, and the caudal cirri are too short to see (in these pics, anyway). We can't tell from the pics how flexible the critters are, unfortunately. Even so, Oxytricha seems likely, to me.
I think it's reasonable to place this guy in the O. fallax species complex.
The group of three postoral ventral cirri (just posterior of the mouth) is pretty tight, whereas in Sterkiella (the other candidate genus, here) the posterior one tends to be isolated. Also, the transverse cirri (the big ones at the posterior of the cell) don't protrude beyond the margins, and the caudal cirri are too short to see (in these pics, anyway). We can't tell from the pics how flexible the critters are, unfortunately. Even so, Oxytricha seems likely, to me.
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