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Stenothyra paludicola topendensis Golding, 2014

Diagnostic features

Stenothyra has an ovately conical shell, with rounded to bluntly angled inflation of the last whorl, dorsoventrally compressed; sutures moderately indented, upper whorls slightly convex; non-umbilicate; pale brown. Sculpture of spiral rows of pits or spiral lirae to smooth. Outer lip prosocline; last whorl restricted in size so that it is smaller than the penultimate whorl, the aperture is small and almost circular. Operculum with two parallel ridges. Animal with short trunk and narrow tentacles. Front of foot is bi-lobed.

Stenothyra paludicola topendensis is distinguished from S. paludicola paludicola by its unsculptured, glossy shell with more convex upper whorls. It is more similar to S. paludicola timorensis but has a slightly taller spire. It is also geographically isolated from the other subspecies of S. paludicola.

Classification

Stenothyra paludicola topendensis Golding, 2014

Class Gastropoda

Subclass Caenogastropoda

Superfamily Truncatelloidea

Family Stenothyridae

Genus Stenothyra Benson, 1856 (Type species: Nematura deltae Benson, 1837; Hooghly River, Calcutta, India).

Original name: Stenothyra paludicola topendensis Golding, 2014. Golding, R. E. (2014). Molecular phylogeny and systematics of Australian and East Timorese Stenothyridae (Caenogastropoda: Truncatelloidea). Molluscan Research 34: 102–126.

Type locality: Swamp 2.7 km ENE from Black Point Range Station, south of the airstrip, Cobourg Peninsula, NorthernTerritory.

Biology and ecology

Found in brackish to freshwater billabongs, rivers and streams in coastal to inland (but still tidally influenced) areas. On edges of water bodies in shallow water on sandy mud.

Distribution

Northern Territory; between the western coast of the Gulf of Carpentaria, through Arnhem Land and Kakadu, to the Cobourg Peninsula.

The typical S. paludicola paludicola Benthem Jutting, 1963 occurs in Papua while another subspecies, S. p. timorensis Golding, 2014 occurs in East Timor.

Further reading

Brandt, R. A. M. (1974). The non-marine aquatic Mollusca of Thailand. Archiv Für Molluskenkunde 105: 1-423.

Davis G. M., Chen C.-E., Xing X.-G. & Wu C. (1988). The Stenothyridae of China. No. 2: Stenothyra hunanensis. Proceedings of the Academy of Natural Sciences of Philadelphia 140: 247-266.

Davis G. M., Guo Y. H., Hoagland K. E., Zheng L. C., Yang H. M. & Zhou Y. F. (1986). Anatomy of Stenothyra divalis from the People's Republic of China and description of a new species of Stenothyra (Prosobranchia: Rissoacea: Stenothyridae). Proceedings of the Academy of Natural Sciences of Philadelphia 138: 318-349.

Golding, R. E. (2014). Molecular phylogeny and systematics of Australian and East Timorese Stenothyridae (Caenogastropoda: Truncatelloidea). Molluscan Research 34: 222-257.

Hoagland K. E. & Davis G. M. (1979). The stenothyrid radiation of the Mekong River 1. The Stenothyra mcmulleni complex (Gastropoda: Prosobranchia). Proceedings of the Academy of Natural Sciences of Philadelphia 131: 191-230.