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Thamnocephalus - beaver-tailed fairy shrimp

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Published on Jun 14, 2009

I collected these strange fairy shrimp (I am assuming they are a species of _Thamnocephalus_) today in a shallow, mud-bottomed, seasonal pond near Portales, New Mexico. Both sexes are represented: females with visible egg sacs and long antennae, and males with large heads and shorter antennae. Note the paddle-shaped telson - hence the common name! The largest individuals are approximately 2.25 inches (about 5 cm).

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