Platycochlium Laidlaw 1950 (original) (raw)

2020

Abstract

<i>Platycochlium</i> Laidlaw, 1950 <i>Platycochlium</i> Laidlaw, 1950: 370. <i>Platycochlium</i> — Zilch, 1960: 560. <i>Platycochlium</i> — Richardson, 1988: 243. <i>Platycochlium</i> — Schileyko, 2000: 785. <b>Type species.</b> <i>Platycochlium sarawakense</i> Laidlaw, 1950, by original designation. <b>Diagnosis.</b> "Shell colourless, translucent when fresh, later white, low conical to almost discoidal in frontal view. Whorls with 4–5 varices next to the peristome (approximately one per &amp;frac13;–½ whorl in the last whorls), each varix preceded by a number of ribs, the ribs crossed by a fine, concentric striation. Umbilicus wide, orbicular to elliptic. Aperture subtriangular with the parietal side concave. Peristome reflected, with a knob-like thickening on the palatal side, above which is a shallow sinus. Teeth four: one angularis, a sinuous lamella starting deep inside and ending in a thick knob; one short basalis; two deeply set palatales, the upper one hidden behind the palatal swelling of the peristome." (Vermeulen, 1991). <b>Distribution.</b> Endemic to Borneo.

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