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Photo#14954
Helgramite - Corydalus cornutus

Helgramite - Corydalus cornutus
Raleigh, Wake County, North Carolina, USA
April 7, 2005
Size: 80 mm
Dr. John Meyer of North Carolina State University captured several of these in a clear stream in suburban Raleigh on 4/7/05. (Clear streams are uncommon in the Piedmont--this one is below an old mill pond--the discharge is clear and well-oxygenated.) He had brought them for a demonstration at a "Bioblitz", and was kind enough to help me take photographs. This was the largest of his several specimens, and he believes this is as large as they get. In a deep water pan, the Helgramite makes constant movements of its abdomen, apparently in order to circulate water over its external gills. These are visible in this photo, projecting in tufts out from the abdomen. Truly an impressive creature.

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Helgramite - Corydalus cornutus Helgramite - Corydalus cornutus