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Cupelopagis vorax

 
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Charles Krebs



Joined: 01 Aug 2006
Posts: 5803
Location: Issaquah, WA USA

PostPosted: Wed Aug 16, 2006 11:27 am    Post subject: Cupelopagis vorax Reply with quote

This unusual rotifer "balloons" out a large bag shaped trap for potential victims to enter (Seen in right 1/3 of top photo). Once the rotifer senses that a suitable meal has entered the trap, it is closed exactly in the manner a purse seine fish net is closed by fisherman.

The top image is a darkfield shot I posted last year. It gives a pretty good "overall" of the rotifer. The two lower, higher magnification shots are DIC images of this trap being closed. The rotifer appears quite transparent under most illumination, and the trap membrane extremely thin. DIC provides a sense of the complex, but gossamer, muscle structures that exist to operate this fascinating feeding mechanism.





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bernhardinho



Joined: 13 Aug 2006
Posts: 560
Location: Germany

PostPosted: Wed Aug 16, 2006 12:03 pm    Post subject: Reply with quote

Hi again

faantaastic!! How big is this thing? It could be a Cupelopagis (Apsilus) vorax.

Bernhard
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Charles Krebs



Joined: 01 Aug 2006
Posts: 5803
Location: Issaquah, WA USA

PostPosted: Wed Aug 16, 2006 3:18 pm    Post subject: Reply with quote

Bernhard... Yes that is what I believe it to be: Cupelopagis vorax (also known as Apsilus lentiformis, A. bipera). They are relatively large. I would estimate the width (longer dimension) of the "trap opening" in the second shot to be about 175 micron.
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Ken Ramos



Joined: 27 Jul 2006
Posts: 7076
Location: lat=35.4005&lon=-81.9841

PostPosted: Wed Aug 16, 2006 4:07 pm    Post subject: Reply with quote

Not much on rotifers Charlie but these are great. That thing has a "maw" on it for sure. Very Happy
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