Wiegmannia ponsonbyi Collinge, 1901
Collinge (1901) original descriptions on Wiegmannia ponsonbyi – “Animal yellowish-brown, with few, almost black, blotches and spots. Head almost black; lateral grooves and median line of rugae well marked. Mantle same colour as body, comes upon all sides of the visceral mass, and has a thin shell-border and fairly well-developed keel. Extremity of foot truncate. Posterior portion of dorsum bluntly keeled. Rugae faintly marked. Sulci blackish. Caudal mucous pore a longitudinal vertical slit extending to the foot-sole. Peripodial groove prominent. Foot-fringe same colour as the body; lineoles black. Foot-sole almost black anteriorly, posteriorly same colour as the body; divided into median and lateral planes.”
“The external form of the penis differs considerably from that of W. gigas or W. dubius, Wgm.; it is much shorter and is not folded to anything like the same extent. From the vestibule as far as the diverticulum it is uniform in circumference; opposite the diverticulum there is a small retractor muscle inserted. The distal portion of the penis gradually tapers, giving place to the vas deferens (Pl. II. fig. 29). The receptaculum seminis is small, somewhat pear-shaped, and opens into the right side of the vagina. This latter organ is much longer than in the preceding species and exhibits a slight constriction just beyond its anterior third. The free-oviduct, on the other hand, is very short. The dart-gland is similar to that in W. gigas, only larger and not so uniform in shape, exhibiting a series of constrictions and dilatations in the anterior (Pl. II. fig. 29, d.s.). Structurally the dart is the same as that in W. gigas, but in this species the one present was much more fragile, and a little over twice the length of that found in the preceding species (Pl. II. fig. 30).” (Collinge, 1901)
Wiegmannia ponsonbyi – “Length (in alcohol) 42 millim. Shell same as in W. gigas, only smaller and reddish-brown in colour.” (Collinge, 1901)
Type locality – “Kuching, N. W. Borneo” (Collinge, 1901)