Colenuda, Ponder, Winston F., Fukuda, Hiroshi & Hallan, Anders, 2014

Ponder, Winston F., Fukuda, Hiroshi & Hallan, Anders, 2014, A review of the family Clenchiellidae (Mollusca: Caenogastropoda: Truncatelloidea), Zootaxa 3872 (2), pp. 101-153 : 141

Colenuda n. gen.

Type species: Colenuda kessneri n. sp.

Etymology. Colis (Latin): penis; nuda (Latin): nude. Refers to the absence of any glands or swellings on the penis. Gender feminine.

Diagnosis. Shell minute (1.9 mm in diameter), with low spire and open umbilicus narrower than in other genera ( Figs 28 A–C and 29A–E). Whorls with fine spiral threads, strong spiral cords or keels absent. Aperture near circular, peristome with shallow indentation dorsally, prosocline, very weak external varix usually present. Operculum simple with no peg or white smear to plate-like deposit on inner surface. Radula as for family, cusps on inner marginal teeth much larger than those on outer marginals. Head-foot with black pigment on cephalic tentacles, snout and penis. Penis wide, simple with no swellings or glands. Bursa copulatrix moderate in size; bursal duct short. Two seminal receptacles.

Remarks. This new genus is similar to species of Coliracemata in shell characters, although the spire is slightly higher and there is a shallow indentation on the dorsal lip of the aperture that is absent in Coliracemata . There is a marked difference in penial morphology, with the penis lacking any swellings or glands on the external surface. The head-foot has distal pigmented bands on the cephalic tentacles as in species of Clenchiella .

Figures

FIGURE 28. Holotypes of Colenuda n. gen. and Coleglabra n. gen. (from left towards right: dorsal, lateral and ventral view respectively). A – C, Colenuda kessneri n. sp. (NTM P. 53500; shell diameter 1.79 mm); D – F, Coleglabra nordaustralis n. sp. (NTM P. 53502; shell diameter 1.82 mm); G – I, Coleglabra sentaniensis (ZMA 1206; shell diameter 1.1 mm).