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Phrantela pupiformis Ponder & Clark, 1993

Diagnostic features

This species is apparently closely related to P. warwicki, having a similar, although more pupiform, shell, in lacking head-foot pigment and a pallial tentacle, and in having very

similar anatomy, including the penis having a slightly swollen distal end and the female genital opening being a subterminal slit. The two taxa can be distinguished by the smaller number of ctenidial filaments in P. pupiformis (16-19 compared with 18-24), and the apices are on the left to central in P. pupiformis and right to central in P. warwicki. In addition the efferent vessel between the pericardium and the posterior end of the ctendium is much longer in P. pupiformis, the capsule gland is thicker in P. pupiformis and the distal end of the penis more elongate in P. pupiformis than in P. warwicki.

Classification

Phrantela pupiformis Ponder & Clark, 1993

Class Gastropoda

Subclass Caenogastropoda

Order Littorinimorpha 

Superfamily Truncatelloidea

Family Tateidae

Genus Phrantela  Iredale, 1943

Original name: Phrantela pupiformis Ponder & Clark, 1993 in Ponder, W. F., Clark, G. A., Miller, A. C and 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.

Type locality: Tributary of Tyenna River, at Gordon River Road, Tasmania.

Biology and ecology

In moss and on small waterfalls and in fern roots. Egg capsules unknown but probably like those of another species of Phrantela; small, with single embryo, and covered in coarse sand grains. Development direct.

The type locality is a stream in beech forest where P. pupiformis occurs sympatrically with Nanocochlea cf. parva.

Distribution

Tributary of Tyenna River, at Gordon River Road, southern Tasmania.

Notes

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

Further reading

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.