1. Potamopyrgus antipodarum. Snout grey to black with pale bifid tip and, often, indistinct pale medial dorsal strip. White pigment spots confined to translucent body behind tentacles, apart from patch at base of the tentacles in front of eyes.
2. Potamopyrgus antipodarum. Snout grey to black with pale bifid tip and, often, indistinct pale medial dorsal strip. White pigment spots confined to translucent body behind tentacles, apart from patch at base of the tentacles in front of eyes.

Potamopyrgus antipodarum. Snout grey to black with pale bifid tip and, often, indistinct pale medial dorsal strip. White pigment spots confined to translucent body behind tentacles, apart from patch at base of the tentacles in front of eyes.

Potamopyrgus antipodarum

© I.F. Smith

Potamopyrgus antipodarum

© I.F. Smith