Isochaetides freyi (Brinkhurst)

Recognition

The dorsal bundles with bifid or simple chaetae but no hairs. Only mature worms can be identified. The anterior bundles have up to 8 chaetae, the upper tooth is thin. The posterior bundles have only 2 or 3 chaetae. The spermathecal chaetae are long, thin and parallel-sided, the penial sheath is short and thin.

Summary

Formerly in Peloscolex. A small tibificid (20 - 25 mm) that is rarely abundant, but favors mesotrophic conditions.

Distribution

A widespread nearctic species.

13 APR 1996 D.L. Gustafson
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dlg@rivers.oscs.montana.edu