Strepsitaurus, SOLEM, 1997

Taylor, James P. A., Johnson, Michael S. & Stankowski, Sean, 2015, Molecular phylogenetics and complementary geographical distributions of species of the Western Australian land snail genera Plectorhagada Iredale, 1933 and Strepsitaurus Solem, 1997 (Gastropoda: Camaenidae), Zoological Journal of the Linnean Society 174 (2), pp. 305-321 : 317-318

STREPSITAURUS SOLEM, 1997

Strepsitaurus Solem, 1997: 1611–1647 . Type species

Pleuroxia ruga Cotton, 1953 , by original description.

Diagnosis

Shell small to medium sized (adult D = 6.8–18.7 mm, H = 3.0– 11.1 mm), between 3 1/3 and 5 3/8 whorls. Spire low to strongly elevated (H / D = 0.38–0.76). Apical sculpture of dense, often elongated micropustules, usually arranged in radial rows, sometimes coalescing to form wavy radial ridges. Spire and body whorl with crenulated ridges, prominence variable from low to very large, plus large micropustules; setae in some species. Body whorl rounded to obtusely angulated, descending moderately to sharply behind lip. Umbilicus variable among species, including open, narrow, or closed. Palatal and basal lips reflected and moderately to broadly expand- ed, columellar lip wider. Parietal wall with a thick callus or a free lip edge. Shell colour white on rib tops, redish to purplish brown in areas between ribs. Lip white or with slight brownish tone. Where known, genitalia with normal sized albumen gland. Talon and hermaphroditic gland typical. Prostate and uterus slightly shortened. Free oviduct very short. Spermatheca with short to very short shaft, expanded head at base of prostate– uterus, extending a little way upwards. Vagina short to medium in length, thicker than free oviduct. Vas deferens typical, entering directly into enlarged head of epiphallus. No epiphallic caecum. Epiphallus very thin-walled, internally with longitudinal pilasters. Penial retractor muscle variable in length, inserting in an arc on middle of epiphallus. Penis short, thick-walled, in- ternally with massive pilaster occupying upper twothirds of chamber. Pilaster with central groove and cross corrugations. Lower portion of penis chamber with simple longitudinal pilasters.

Distribution

Extant species of Strepsitaurus are restricted to the Cape Range, Western Australia, whereas Strepsitaurus cardabius Solem, 1997 , known only from subfossils in coastal dunes, extends the distribution southwards, from near Ningaloo Homestead to Gnaraloo (22°42′S).