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Gergovia exigua (E.A. Smith, 1891)

Description: Description of holotype after Verhecken (1991): Protoconch consisting of one smooth, white whorl. Teleoconch of 3 whorls; whorls rounded, with spiral ribs and weak axial folds. Spiral sculpture of thin, low ribs, two on spire whorls and three on body whorl. Axial sculpture of low, narrow folds, 11 on penultimate whorl and 15 on body whorl; tiny nodules at intersections with spiral ribs. Aperture semicircular, with short, relatively wide siphonal canal; outer lip smooth internally, not flared. Umbilicus absent. Columella with one low plait, border of siphonal canal forming another even lower plait. Colour off-white.

Size: Up to 6.6 mm in length.

Distribution: Endemic to Australia: Sydney, NSW, to eastern Victoria.

Habitat: Subtidal, in 750-1000 metres. Rare, known only from four specimens.

Comparison: This species is more elongate than Cancellaria patricia, and lacks the strong axial sculpture.

Synonymy: Verhecken (1991) concluded that Inglisella nympha Garrard, 1975 is a synonym of this species. The species figured as Gergovia exigua by Garrard (1975) and Wilson (1994) is a misidentification of Cancellaria patricia.

Remarks: The description above is that of the holotype. The three other known specimens have very weak or no axial ribbing.

Figs. 1,2   Holotype of Inglisella nympha. 53 km E x S of Green Cape, NSW, in 860 m (C.089280)


Copyright Des Beechey 2005