1. Potamopyrgus antipodarum snouts may be slightly transversely wrinkled when contracted. Tentacles translucent light grey, darkest dorsally except, often, for a fine faint white medial line.
2. Potamopyrgus antipodarum snouts may be slightly transversely wrinkled when contracted. Tentacles translucent light grey, darkest dorsally except, often, for a fine faint white medial line.

Potamopyrgus antipodarum snouts may be slightly transversely wrinkled when contracted. Tentacles translucent light grey, darkest dorsally except, often, for a fine faint white medial line.

Potamopyrgus antipodarum

© I.F. Smith

Potamopyrgus antipodarum

© I.F. Smith