Popis
Autor: Jan Delsing
Text ID: 110157
Text Type: 1
Page: 0
Založeno: 27.06.2021 17:27:53 - Uživatel Delsing Jan
Language: EN
Odkazová funkce: [[t:1337861,textblock=110157,elang=EN;Popis]]
Shell small, ovate-conic, white, moderately strong, shouldered, sculptured with blunt axial costae and broad indistinct spiral cords. Spire gradate, 1,5 times height of aperture. Whorls five, including a smooth dome-shaped protoconch of 1,5 whorls. Upper third of each whorl occupied by a distinct flattened shoulder, lower two-thirds sculptured with strong vertical bluntly rounded axial costae, seventeen on the last whorl. Suture narrowly canaliculate, margined above and below by distinct spiral cords, the uppermost of which marks the lower extremity of the axials. On the body whorl and base there are five fairly distinct flattened spiral cords, the two margining the suture plus three below, leaving a broad unsculptured zone around the columella. In addition there are six very indistinct spiral cords showing between the interstices of the axials on the last whorl. Aperture ovate, slightly oblique. Peristome continuous across parietal wall, strengthened along the outer lip by a rounded external varix.
Height 2,05 mm.; diameter 1,25 mm. (Holotype).
Habitat: Off Three Kings Islands, St. 933, 260 m.
This species stands nearer to the littoral H. hamiltoni than to the deeper water and southern H. huttoni.
Powell, A.W.B., 1937. New species of marine Mollusca from New Zealand.