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Murdochella macrina Iredale, 1936

Description: Shell tall and slender, with up to 8 teleoconch whorls. Protoconch inflated, of 2 whorls, initially spirally corded, then axially ribbed, terminating with elevated varix. Teleoconch whorls weakly rounded, with dense, lamellose, axial ribs, about 50 ribs per whorl. Interspaces with strong spiral cords, 5 on last whorl. Last whorl with strong basal cord level with top of aperture, terminating the axial ribs. Aperture oval; outer lip with normal rib externally. Umbilicus closed. Colour white.

Size: Up to 7 mm in length.

Distribution: Endemic to Australia; off Moreton Bay, Queensland, around southern Australia to Bunbury, south-western WA.

Habitat: Known from 75-158 m. Uncommon.

Comparison: Distinguished by the dense axial ribs, about 50 per whorl.

Synonymy: Glyptozaria westralia Garrard, 1982 is a synonym (NEW SYNONYM). It matches the protoconch and teleoconch characters of the present species, although it has unusually strong spiral cords, but these fall within the range of variation shown by available specimens.

Fig. 1: Great Australian Bight, South Australia, in 75 m (C.unreg)

Fig. 2: HOLOTYPE of Glyptozaria westralia. East of Hood Point, Great Australian Bight, WA (C.123852)


Copyright Des Beechey 2008