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Edgbastonia alanwillsi Ponder, Wilke, Zhang, Golding, Fukuda, & Mason 2008

Diagnostic features

Shell ovate-conic, protoconch of about 1.1 whorls; teleoconch with fine spiral threads, aperture with short columellar keel-like fold. Central teeth with two pairs of basal cusps, outer pair much smaller than inner. Male with narrow pallial vas deferens having several coils, penis long, simple, tapering to point, penial duct narrow throughout. Female with posterior bursa copulatrix and seminal receptacle; albumen gland shorter than capsule gland; common duct opens to large ventral chamber open to posterior capsule gland; chamber narrows anteriorly to form tube separate from anterior half of capsule gland, and extends anterior to gland.

Classification

Edgbastonia alanwillsi Ponder, Wilke, Zhang, Golding, Fukuda & Mason 2008

Class Gastropoda

Subclass Caenogastropoda

Order Littorinimorpha

Superfamily Truncatelloidea

Family Tateidae

Genus Edgbastonia Ponder, Wilke, Zhang, Golding, Fukuda, & Mason 2008 (Type species: Edgbastonia alanwillsi Ponder et al., 2008).

Original name: Edgbastonia alanwillsi Ponder,Wilke, Zhang, Golding, Fukuda, & Mason 2008. Ponder, W. F., Wilke, T, Zhang, W. H., Golding, R. E.,Fukuda, H, and Mason, R. A. B. 2008. Edgbastonia alanwillsi n. gen & n. sp. (Tateinae: Hydrobiidae s.l.: Rissooidea: Caenogastropoda); a snail from an artesian spring group in western Queensland, Australia, convergent with some Asian Amnicolidae Molluscan Research 28: 89–106.

Type locality: Edgbaston Station near Aramac, Spinifex Ridge Spring, Queensland.

Biology and ecology

The species is uncommon, mostly found in very small numbers (usually only one or a few even in samples that can contain hundreds of tateids) and has been found in ten of the 50 active springs at Edgbaston Station. The type locality is only one of four springs in which more than five specimens of Edgbastonia have been found. Given its general similarity to one of the most abundant of the Edgbaston tateids, and its rarity, it has not been observed in the field so its preferred microhabitat is unknown.

Distribution

Restricted to a small group of springs on Edgbaston Station near Aramac in western Queensland.

Notes

The shape of the shell of this species somewhat resembles Jardinella edgbastonensis Ponder & Clark, 1990, found in the springs at Edgbaston Station. Edgbastonia differs in its shell being a little smaller and narrower, and having a distinctive columellar tooth. In addition, the operculum retracts only as far as the outer part of the aperture in the species currently included in Jardinella, whereas in Edgbastonia it retracts out of sight deep within the aperture, exposing the columellar tooth.

Based on morphology, Edgbastonia does not appear to be closely related to any extant Australian taxon but molecular analysis places it with Jardinella. In shell characters, Edgbastonia resembles some members of the Asian Amnicolidae

Further reading

Ponder, W. F. & Clark, G. A. (1990). A radiation of hydrobiid snails in threatened artesian springs in western Queensland. Records of the Australian Museum 42: 301-363.

Ponder, W. F. (2004). Endemic aquatic macroinvertebrates of artesian springs of the Great Artesian Basin—progress and future directions. Records of the South Australian Museum Monograph Series 7: 101-110.

Ponder, W. F., Wilke, T., Zhang, W.-C., Golding, R. E., Fukuda, H. & Mason, R. A. B. (2008). Edgbastonia alanwillsi n. gen. and n. sp. (Tateinae: Hydrobiidae s.l.: Rissooidea: Caenogastropoda): a snail from an artesian spring group in western Queensland, Australia, convergent with some Asian Amnicolidae. Molluscan Research 28: 89-106.