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Trigonostoma laseroni (Iredale, 1936) Description: Whorls sharply shouldered, area between shoulder and suture concave, crossed obliquely by axial ribs. Sculptured with oblique axial ribs, about eight on body whorl and 10-12 on penultimate whorl. Spiral sculpture of rounded ribs, five on body whorl and three on penultimate, nodular at intersection with ribs. Umbilicus widely open; columella with two strong plaits deep within aperture; inner lip reflected partly over umbilicus. Outer lip thin; smooth internally or with 10-12 lirae. Colour white, cream, pink or orange-brown, occasionally with brown patches above shoulder. Size: Up to 23 mm in length, typically 15 mm. Distribution: Endemic to Australia: Moreton Bay, Queensland, to Bermagui, NSW. Habitat: Subtidal to 66 metres. Very uncommon. Comparison: This species, along with T. tessella, has two plaits on the columella, and a wide umbilicus. Species in the genus Scalptia have three plaits on the columella and the umbilicus is narrower. Remarks: The columella plaits are not visible in the photograph as they are deep within the aperture. Figs. 1,2,3 Broulee, NSW (C.074996)
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