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Terebra tristis Deshayes, 1859 Description: This species is variable in colouration and sculpture. Subsutural band constricted, not marked off from rest of whorl by a subsutural groove. Axial sculpture varies in strength and number of ribs from almost absent, through thin and fine ribs, to broader and more elevated; sometimes from suture to suture, sometimes restricted to whorl below subsutural band, but usually continuing to the lower suture. Spiral sculpture absent to naked eye. Fasciolar band present; siphonal notch shallow. Outer lip thin and simple. Colour usually cream or off-white, occasionally uniformly brown; anterior half of body whorl brown; subsutural band sometimes light brown. Size: Up to 24 mm in length. Distribution: Australia and New Zealand. In Australia, from Yeppoon, Queensland, to Great Australian Bight. Habitat: Sub-tidal to 200 m. Occasionally taken as beach specimens. Moderately common. Comparison: Terebra jacksoniana may be a strongly sculptured form of this species. Fig. 1b shows a specimen with the colouration of T. jacksoniana but with sculpture typical of T. tristis. Synonymy: Arcus assimilis Angas, 1867; Arcus bicolor Angas, 1867; Pervicacia subplicata Cotton, 1952; Terebra inconspicua Pritchard & Gatliff, 1902 Fig. 1: a. Simpsons Bay, Port Hacking, NSW (C.387289) b. Sydney Harbour, NSW (C.387322) c. Twofold Bay, NSW in 15 m (C.370851) |
