A Field Guide to the Snails of Lord Howe Island

67 Goweroconcha waterhousiae (Hedley, 1897) Cinnamon-zigzag Pinwheel Snail Shell. Size: H = 3.3-4.2 mm, D = 7.4-8.1 mm. Colour: Dark reddish-brown with zigzagging cream-coloured flammulations. Shape: Discoidal with a flat to slightly sunken spire; whorls rounded, slightly flattened above periphery on last whorl near lip; sutures impressed; last whorl expanded and rapidly descending. 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, upper edge flattened. Umbilicus: Widely open. Animal. Cream to pale grey, head pink, with dark grey to black eyestalks and two dark bands leading from eyestalks along neck. Key distinguishing features. Medium-sized, discoidal shell with a flat to sunken spire and rounded whorls, last whorl slightly flattened above periphery; pale body with dark eyestalks and dark bands on neck; expanded last whorl. Habitat and occurrence. Common and widespread in the lowlands; Little Slope. Specimens from the lower-to-mid-slopes of the southern mountains (e.g. Erskine Valley, Goat House Cave, Big Slope) appear to represent an unnamed species. Found in rainforest and moist woodland, under logs or dead palm fronds in litter. Remarks. Allopatric with respect to its congeners. Goweroconcha waterhousiae