< Previous species

Next species >

2259-1.JPG (96956 bytes)


2260-1.JPG (103131 bytes)


2261-1.JPG (100015 bytes)

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)


Copyright Des Beechey 2005