Potamopyrgus antipodarum | The Conchological Society of Great Britain and Ireland

<p><em>Potamopyrgus antipodarum</em> (J E Gray, 1843)</p>

Potamopyrgus antipodarum. Male from population with highest recorded % of males in Europe. Flexed penis with longitudinal band of wavy white on grey. September 2012. Llanfihangel, Wales. For further information click “View Image Details”

Species

Potamopyrgus antipodarum

Photographer / copyright holder

I.F. Smith

Map name is Llanfihangel y Traethau, but road signs and study by C. Wallace refer to village as “Ynys”.

Potamopyrgus antipodarum. Female. Extensive white pigment marks on sides of foot and posterior of head, with a few white marks extending to the eye, and patch of white in front of eye on tentacle. Sept. 2012. Llanfihangel, Wales.

Species

Potamopyrgus antipodarum

Photographer / copyright holder

I.F. Smith

Potamopyrgus antipodarum pool fed by drain at top of salting, Dee Estuary, Cheshire. Salinity 0 p.p.t. Filamentous algae over bare sand, black and anaerobic below surface. Near high water mark; Scirpus maritimus beyond log in image.

Species

Potamopyrgus antipodarum

Photographer / copyright holder

I.F. Smith

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.

Species

Potamopyrgus antipodarum

Photographer / copyright holder

I.F. Smith

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.

Species

Potamopyrgus antipodarum

Photographer / copyright holder

I.F. Smith

Potamopyrgus antipodarum. Sole of foot. White pigment spots on tentacle restricted to just in front of eyes. From slowly flowing freshwater pool at top of salting, Dee Estuary, Cheshire.

Species

Potamopyrgus antipodarum

Photographer / copyright holder

I.F. Smith

Potamopyrgus antipodarum. Darker dorsal surface of tentacle and fine white medial line indicated by arrow. Ribbing inside aperture is ctenidium (gill). From slowly flowing freshwater pool at top of salting, Dee Estuary, Cheshire

Species

Potamopyrgus antipodarum

Photographer / copyright holder

I.F. Smith

Nearly all Potamopyrgus antipodarum, like this one, are female, lacking a penis behind the head. From stream just above tidal limit. September 2012. Llanfihangel y Traethau, Merionydd, Wales.

Species

Potamopyrgus antipodarum

Photographer / copyright holder

I.F. Smith

Potamopyrgus antipodarum shell found empty. Rusty colour may be result of oxidation of black deposit acquired in life. From freshwater pool with substrate of black anaerobic sand covered by few mm of reddish brown aerobic sand. Dee Estuary, Cheshire.

Species

Potamopyrgus antipodarum

Photographer / copyright holder

I.F. Smith

Translucent yellow-horn shell colour of Potamopyrgus antipodarum is often hidden by dark encrustation, except on the most recent whorl of still growing juveniles and sub-adults, such as this, shell height 3.8mm.

Species

Potamopyrgus antipodarum

Photographer / copyright holder

I.F. Smith

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