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Hemistomia minutissima Ponder,1982

Diagnostic features

This minute species (maximum length of the shell about 1.5 mm) has fine spiral striae. The operculum has 1-2 white pegs.

The penis is simple in all Hemistomia species.

Classification

Hemistomia minutissima Ponder,1982

Class Gastropoda

Subclass Caenogastropoda

Order Littorinimorpha 

Superfamily Truncatelloidea

Family Tateidae

Genus Hemistomia Crosse, 1872

Original name: Hemistomia minutissimus Ponder,1982. Ponder, W.F. (1982) Hydrobiidae of Lord Howe Island (Mollusca: Gastropoda: Prosobranchia). Australian Journal of Marine and Freshwater Research 33: 89-159.

Type locality: At head of minor tributary above main tributary on north side of Erskine Valley, Lord Howe Island.

Biology and ecology

A subterranean species possibly induced in response to an impermanent water supply. It lives associated with small seepages.

Additional information on the biology and ecology of members of this family can be found in Fauna of Australia, vol. 5B, p. 752-755.

Distribution

Northern side of Erskine Valley, Lord Howe Island.

Notes

All the Hemistomia species are strongly clustered into distinct geographical locations on Lord Howe Island. H. minutissima is a tiny subterranean species.

Further reading

Ponder, W. F. (1982). Hydrobiidae of Lord Howe Island (Mollusca: Gastropoda: Prosobranchia). Australian Journal of Marine and Freshwater Research 33: 89-159.