A Field Guide to the Snails of Lord Howe Island

78 Family Charopidae (Pinwheel Snails) Pseudocharopa exquisita Peile, 1929 Exquisite Pinwheel Snail Shell. Size: H= 5.5-7mm, D= 8.8-9.6mm. Colour: Flammulatedwith zigzags of orange-brown and cream. Shape: Ear-shaped with a moderately low spire and a rapidly increasing last whorl; whorls rounded with a supraperipheral sulcus; sutures impressed. Sculpture: Protoconch with radial ribs and spiral threads, ribs becoming more crowded towards teleoconch; teleoconch with very widely spaced, curved, prominent radial ribs, microradial threads and microspiral cords. Aperture: Ovately lunate, breadth greater than height, distorted by sulcus. Umbilicus: Very narrow, covered by reflected lip. Animal. Not known. Key distinguishing features. Medium-sized shell with rapidly increasing last whorl and a supraperipheral sulcus, with bright, zigzagging flammulations of orange-brown and cream and very widely spaced ribs. Habitat and occurrence. Only known from the summit of Mt Lidgbird, crawling on wet rock faces. Remarks. This species was collected in 1914 in large numbers on the summit of Mt Lidgbird, but has never been found since. It may be extinct, or this may be a result of very infrequent collecting on the Mt Lidgbird summit and the low detectability of rock-face species in dry weather. Pseudocharopa ledgbirdi, sheltering in a rock crevice