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Parviterebra trilineata (A. Adams & Angas, 1864) Description: Protoconch smooth, of 2½ whorls. Shell very slender, upper teleoconch whorls weakly angled at periphery, whorls concave below suture; aperture about 2/5 shell length. Sculptured with slightly oblique axial folds, about 15 on penultimate whorl, restricted to upper quarter on last whorl. Whole surface covered with fine, widely spaced spiral grooves, about 25 on last whorl. Outer lip smooth, not thickened internally or externally. Columella smooth, with thin callus extending onto body whorl. Siphonal notch broad, no siphonal canal. Colour white, with brown spots below the suture, sometimes descending into axial flames; occasionally 3-5 fine spiral brown lines on body whorl. Size: Up to 15 mm in length. Distribution: Endemic to Australia; numerous records from Catherine Hill Bay, NSW, to Twofold Bay, NSW; records that require confirmation from Brampton Island, Queensland, and Cape Leveque, north-west Australia. Also reported from South Australia. Habitat: Subtidal, down to 35 m, but mainly known from beach shells. Uncommon. Comparison: Distinguished from P. brazieri by the strong axial folds, angular whorls, spiral grooves and differing colour pattern. Remarks: In the more exposed parts of Sydney Harbour, Botany Bay and Port Hacking this is moderately common, more so than P. brazieri. Fig. 1: Cronulla Beach, NSW (C.372898) |
