A Field Guide to the Snails of Lord Howe Island

68 Family Charopidae (Pinwheel Snails) Goweroconcha wenda Iredale, 1944 Pale-zigzag Pinwheel Snail Shell. Size: H = 1.9-2.4 mm, D = 4.2-4.5 mm. Colour: Pale golden brown with faint, cream flammulations visible on some shells. Shape: Discoidal with a flat to slightly sunken spire; whorls rounded, becoming angulate on lower edge on last whorl; sutures impressed. Sculpture: Protoconch with weak spiral sculpture initially, then with radial and spiral sculpture forming a series of pits; Teleoconch with prominent, sinuous, moderately widely spaced ribs, microradial threads and low microspiral cords. Aperture: Roundly lunate, angulate at base. Umbilicus: Widely open. Animal. Not known. Key distinguishing features. Small discoidal shell with flat to sunken spire; rounded whorls with angulate base on last whorl; teleoconch sculpture moderately widely spaced; shell colour pale with only faint flammulations. Habitat and occurrence. Mt Gower summit and Little Slope, in litter. Collected alive for the first time in 2018 and 2019. Very rare. Remarks. This species is known from very few specimens but has recently been collected alive on the Mt Gower summit. It is much less abundant than its congeners, but is also likely to be under-represented in collections due to its small size. Goweroconcha wilsoni Iredale, 1944 Gower Wilson’s Pinwheel Snail Shell. Size: H = 4.4-5.3 mm, D = 9-11 mm. Colour: Dark reddish-brown with cream, zigzagging flammulations. Shape: Discoidal with a flat to slightly sunken spire; whorls rounded; sutures impressed; last whorl rapidly expanding. Sculpture: Protoconch with reticulate sculpture formed from radial and spiral threads; teleoconch with prominent, sinuous, moderately closely spaced radial ribs, microradial threads and low microspiral cords. Aperture: Roundly lunate. Umbilicus: Widely open. Animal. Body dark grey to black.