I've never seen these before from this specific pond. The pond is in na small township park fed by an adjacent stream, so the water turnover is quite rapid.
Protist ID please
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Protist ID please
Michael Reese Much FRMS EMS Bethlehem, Pennsylvania, USA
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Re: Protist ID please
Hi Michael. This is likely Holophrya ovum (=Prorodon viridis, in older sources), a rotund ciliate with algal endosymbionts. In the second image, we have a top view of the mouth with its surrounding basket of nematodesmata (stiff microtubular rods that support the cytostome). Here's a view of the same structure in H. ovum, from Foissner et al., 1994:
It Came from the Pond (Blog): http://www.itcamefromthepond.com/
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Re: Protist ID please
Thanks for the ID.
Mike
Mike
Michael Reese Much FRMS EMS Bethlehem, Pennsylvania, USA