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Acanthocystis (Actinopoda: Heliozoea)

I am indebted to Uriel Ruíz García in Mexico for correctly identifying this cell. He noticed the multiple endobiotic chloroplasts and bifurcate tips on the 'bristles'. His recommendation for the species is the fairly common Acanthocystis turfacea. August 2021.

Acanthocystis sp. from Hoyt Pond, Madbury, NH USA
Bristles are >50 uM in length with bifurcate tips
Multiple green discoid chloroplasts are endobiotic Zoochlorella
Photo by John Dufresne, University of New Hampshire, Durham USA

A smaller example from the same lake sample.

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