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TRIPHORIDAE


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Sagenotriphora ampulla (Hedley, 1903)

Description: Shell very small, squat, sinistral. Protoconch plankotrophic, of 4-4 whorls, with 2 spiral threads and numerous axial riblets. Teleoconch strongly convex, last whorl narrower than preceding whorl. Teleoconch whorls with 4 beaded spirals cords and axial costae; spirals 1 and 3 commence immediately after protoconch, spiral 2 commences on 4th or 5th whorl; spiral 4 only exposed on last whorl. Another 2 spiral ribs on base (numbered 5 and 6). Spirals 1 and 3 of similar size, spiral 2 weaker. Axial costae of similar strength to spirals, strongly nodulose at intersections, 16-22 on penultimate whorl. Outer lip of aperture flared, anterior siphonal canal short and slightly upturned, posterior canal a broad triangular notch. Protoconch yellowish-brown; teleoconch coloured with alternating bands of reddish brown and white or buff; base reddish brown.

Size: Mature shells 2.3 - 4.9 mm in length.

Distribution: Australia, New Zealand and Kermadec Islands. In Australia, Woolgoolga, NSW, southwards and around southern Australia to Beachport, eastern SA.

Habitat: Living specimens are known from the intertidal zone on rocky shores. Empty shells are know from beach washup down to about 70 m. Uncommon.

Figs. 1, 2:  Little Coogee Bay, NSW (C.113682)

Fig. 3:  From Hedley, 1903, pl. 33, fig. 39

 

Copyright Des Beechey 2015