Stylaria lacustris (Linnaeus)

Recognition

Dorsal hair chaetae are present and number 1 to 3 per bundle. There are also 3 to 4 needle chaetae per dorsal bundle, and these lack a nodulus and begin in segment 6. The ventral chaetae number 4 to 14 and have a proximal double bend. A proboscis is present and it is often set in an invagination. Among our naids, a proboscis is present only in Arcteonais lomondi, which has far more dorsal chaetae, and Pristina which has the dorsal chaetae beginning in the second segment. Eyes and coelomocytes are present.

Summary

A swimming species ranging from 5.5 to 18 mm in length. It sometimes occurs in brackish water.

Distribution

A widespread holarctic species.

26 MAY 1996 D.L. Gustafson
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dlg@rivers.oscs.montana.edu