| Potamopyrgus antipodarum (J.E. Gray, 1843) |
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Fresh and brackish waters of New Zealand. Invasive species in worldwide temperate countries. Grazer and detritus feeder in shallow water. Also predator on very young oysters. Original taxon: Amnicola antipodarum. Due to the high variability of its shell, this species received many synonyms. – On shallow sediments, along the northwestern shore of Vouliagmeni marine lake, west of Perachora, in the north-west of Loutraki, N. Korinthia, Greece. 3mm. |
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| Operculate specimen collected in the channel downstream the Limni Moústou, SE. of Astros, North Kynouria, Arcadia, Peloponnese, S. Greece. 2,8mm. |
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| Sisi harbour, east of Mália, N. Lassithi, N. Crete. 3mm. |
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| Variant “carinata” Marshall. Slightly upstream the mouth of the Fiume Ciane, Porto grande di Siracusa, SE. Sicily. 4,6mm. |
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In a stream above Paratella, NE. of Talasani, E. Corsica. Original picture provided by J. Renoult for iNaturalist.
– (CC BY-NC) – |
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| Spire variation. On the southern bank of the Rio Ebre, between Riumar harbour and the Gola de Tramuntana, Sant Carles de la Ràpita, Tarragona, Catalunya, NE. Spain. 3,1mm. |
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Together with a Mercuria sp., Theodoxus fluviatilis (Linnaeus, 1758) and Eupaludestrina stagnorum (Gmelin, 1791) near a lagunar environment, in a spring on Sainte-Lucie island, north of Port-la-Nouvelle, Aude, Occitania, S. France. 4,3-3,6-3,75mm. |
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A specimen floating under the surface, on which it feeds (microalgae). Douctouyre river, near the confluence with the rivulet of Senesse, north of Dun, Ariège, S. France.
Original picture provided by A. Bertrand (FR).
– (CC BY-NC-SA) – |
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| The species can live also in the underflow of streams, and tolerates highly mineralized waters. – Above: specimens from the cold spring at Lamiña cave, Camou-Cihigue, W. Pyrenees, SW. France. Size of the collected specimen: 4,2mm. |
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| Heavily encrusted specimen from the brook at Camou, downstream Lamiña springs. 4,4mm. |
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| Amongst weeds in a shallow non-tidal ditch close to Thornham Marina, Thorney Island, West Sussex, United Kingdom. |
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| In the gardens of Stonyhurst College, Clitheroe, Lancashire, United Kingdom. Original picture provided by C. McLennan (UK) for iNaturalist – (CC BY-NC). |
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| Queen’s Park, Thorndon, Wellington, North Island, New Zealand. Original picture provided by C. Stephens (NZ) for iNaturalist – (CC BY-SA). |
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| A specimen from Balistra marine lagoon, Bonifaccio, S. Corsica. 4,1mm. Compared with a slender specimen of Eupaludestrina bigugliana (Caziot, 1908) from the same spot, we notice the great difference of the protoconches: small and tapering in Potamopyrgus, flat and sunken in Eupaludestrina. |