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Coxiella (Coxiella) exposita (Iredale, 1943)

Diagnostic features

This small species reaches about 6 mm in length. The adult shell generally has about three convex whorls and is dark reddish brown with concentric striations. The operculum is partially spiral.

Classification

Coxiella (Coxiella) exposita (Iredale, 1943)

Class Gastropoda

Subclass Caenogastropoda

Order Littorinimorpha

Superfamily Truncatelloidea

Family Pomatiopsidae

Subfamily: Pomatiopsinae

Genus Coxiella Smith, 1894

Subgenus Coxiella

Original name: Coxielladda exposita Iredale,1943. Iredale,T. (1943). A basic list of the freshwater Mollusca of Australia. Australian Zoologist 10: 188 - 230.

Type locality: Cranbrook, inland from Albany, Western Australia.

State of taxonomy

We follow Macpherson (1957), which is the latest taxonomic treatment of this group.

Biology and ecology

Inhabits salt lakes.

Coxiella have a deep furrow on each side of the head, and a suprapedal fold around the sides of the foot. Movement is by steps. The snout is long. The eyes have a cluster of glands above them. Coxiella are dioecious. Development is direct. Females are oviparous, depositing eggs singly in capsules coated in sand or mud. Coxiella probably feed on organic detritus.They are amphibious.

Distribution

Southwest coast and Indian Ocean divisions, Western Australia.

Notes

For species description see Macpherson (1957).

Further reading

Beesley, P. L., Ross, G. J. B. & Wells, A., Eds. (1998). Mollusca: The Southern Synthesis. Parts A & B. Melbourne, CSIRO Publishing.

Davis, G. M. (1979). The origin and evolution of the gastropod family Pomatiopsidae, with emphasis on the Mekong River Triculinae. Academy of Natural Sciences of Philadelphia Monographs 20: 1-120.

Iredale, T. (1943). A basic list of the fresh water Mollusca of Australia. Australian Zoologist 10: 188-230. 

Macpherson, J. H. (1957). A review of the genus Coxiella Smith, 1894, sensu lato. Western Australian Naturalist 5: 191-204.