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Phrantela marginata (Petterd, 1889)

Diagnostic features

The shell of P. marginata is narrower than nearly all other species and has a relatively smaller last whorl than any other species.This species is generally similar to P. annamurrayae and P. [1] [2]conica which all have a long, narrow penis with a narrow base and an undulating penial duct.

Classification

Phrantela marginata (Petterd, 1889)

Class Gastropoda

Subclass Caenogastropoda

Order Littorinimorpha 

Superfamily Truncatelloidea

Family Tateidae

Genus Phrantela  Iredale, 1943

Original name: Potamopyrgus (?) marginata Petterd, 1889. Petterd, W. F. (1889). Contributions for a systematic catalogue of the aquatic shells of Tasmania. Papers and Proceedings of the Royal Society of Tasmania 1888, 60-83.

Type locality: A small stream near Heazlewood River, Tasmania.

Biology and ecology

This species lives mainly amongst aquatic vegetation, it is also found in root mats in the bed of a small trickle. Egg capsules unknown but probably like those of another species of Phrantela; small, with single embryo, and covered in coarse sand grains. Development direct.

Distribution

This species is known from a few localities in a small area along Thirteen Mile Creek, a tributary of the Heazlewood River, NW Tasmania.

Notes

This species is on the Tasmanian Threatened species list of Invertebrate Animals as Rare (small population at risk).

Further reading

Petterd, W. F. (1889). Contributions for a systematic catalogue of the aquatic shells of Tasmania. Papers and Proceedings of the Royal Society of Tasmania 1888: 60-83.

Ponder, W. F., Clark, G. A., Miller, A. C. & Toluzzi, A. (1993). On a major radiation of freshwater snails in Tasmania and eastern Victoria: a preliminary overview of the Beddomeia group (Mollusca: Gastropoda: Hydrobiidae). Invertebrate Taxonomy 7: 501-750.

Smith, B. J. (1992). Non-marine Mollusca. Pp. i-xii, 1-408 in W. W. K. Houston. Zoological Catalogue of Australia, 8. Canberra, Australian Government Publishing Service.