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Hydra viridis (a.k.a. Chlorhydra) filled with endosymbiotic Zoochlorella sp.  Note epizoites that roam around the surface of the host.
Image by Jonathan Dufresne, University of New Hampshire, Durham USA

Red pigmented coiled Hydra with "bud"
Image by Jonathan Dufresne, University of New Hampshire, Durham USA

Red pigmented Hydra with "bud"
Image by Jonathan Dufresne, University of New Hampshire, Durham USA

Hydra viridis (a.k.a. Chlorhydra) approaching a Simocephalus (large cladoceran that escaped).
Image by Jonathan Dufresne, University of New Hampshire, Durham USA

Elongate Hydra viridis (a.k.a. Chlorhydra) with roaming epibionts.
Image by Jonathan Dufresne, University of New Hampshire, Durham USA

Hydra viridis (a.k.a. Chlorhydra) next to a Chydorus (a small cladoceran) for size comparison
Image by Jonathan Dufresne, University of New Hampshire, Durham USA

"Chlorhydra" containing numerous Zoochlorella cells, capturing a Daphnia (a large cladoceran, "water flea").
Image by Steven F. Lowery, University of Ulster at Coleraine, Londonderry, North Ireland.

Hydra sp. released nematocysts.
Image posted at molecularexpressions.com 

Hydra viridis
Modified from photograph by Ralf Wagner posted online

Hydra viridis with zoochlorella and cnidoblasts evident
Modified from photograph by Bernhard Lebeda posted online

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