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Gergovia recessa (Iredale, 1925)

Description: Protoconch consisting of 1 smooth white or fawn whorls. Teleoconch whorls shouldered, with very strong axial ribs crossed by strong but weaker spirals.. Body whorl with 3-5 primary spiral ribs, the uppermost at the shoulder, and finer secondary spiral threads; 3-5 between suture and shoulder, about 6 on base, and sometimes 1-2 between major spirals. Axial folds about 10 on body whorl and penultimate whorl. Aperture with short, broad, open siphonal canal; outer lip with 5-11 lirae extending deep into aperture. Umbilicus a narrow fissure behind columellar callus. Columella with two strong plaits. Colour fawn or brown.

Size: Up to 8 mm in length.

Distribution: Endemic to Australia; Crowdy Head, NSW, to Cape Everard, Victoria.

Habitat: Known from 18-137 metres. Uncommon.

Comparison: This species is similar to G. patricia, but has stronger axial and spiral ribs, more secondary spiral threads, and the lirae in the aperture are always present.

Remarks: This may be the same species as Gergovia patricia. Perhaps the juvenile, weakly sculptured specimens are recognised as G. patricia and the mature, strongly sculptured shells as G. recessa. The type of G. recessa (Fig. 1) is intermediate in sculpture strength, in contrast to the strongly sculptured specimen shown in Fig. 2.

Fig. 1:  HOLOTYPE Off Batemans Bay, NSW, in 137 m (C.053771). (Outer lip is broken).

Fig. 2:  Off Twofold Bay, NSW, in 82 m (C.090152)


Copyright Des Beechey 2005