Docleiana Delicado & Pešić, 2021

Delicado, Diana, Pešić, Vladimir & Ramos, Marian A., 2021, Arganiella Giusti & Pezzoli, 1980 (Caenogastropoda: Truncatelloidea: Hydrobiidae): a widespread genus or several narrow-range endemic genera?, European Journal of Taxonomy 750 (1), pp. 140-155 : 146-147

Genus Docleiana Delicado & Pešić gen. nov.

urn:lsid:zoobank.org:act:04639DB3-91D2-46B7-BFAB-FFC1EA3C27BD

Type species

Arganiella tabanensis Boeters, Glöer & Pešić, 2014 .

Revised diagnosis

Shell valvatiform; whorls ca 3; aperture complete, from rounded to ellipsoidal; outer lip narrow, straight in lateral profile; umbilicus wide. Operculum corneous, yellowish, thin, pliable, rounded, paucispiral with a central nucleus, without peg. Two pairs of basal cusps on each central radular tooth. Ctenidium well developed, with 10–11 gill filaments. Animal unpigmented. Osphradium positioned opposite approximately to the middle of the ctenidium. Stomach without gastric caecum; rectum forms a gentle V-shape in the mantle cavity. Bursa copulatrix small, globular, pedunculated and positioned beyond the posterior edge of the albumen gland; bursal duct longer than bursal length; unpigmented renal oviduct; one pyriform seminal receptacle arising at the insertion point with the bursal duct loop. Penis small and simple, gradually tapering.

Etymology

The new genus is named after Doclea, the name of the Roman city located on the site of modern Podgorica on whose municipal territory a new genus was found; gender feminine.

Remarks

Docleiana Delicado & Pešić gen. nov. can be distinguished from Arganiella as the former has a more ellipsoidal shell aperture, a narrower base of the penis, a smaller bursa copulatrix that is positioned beyond the posterior edge of the albumen gland, a larger seminal receptacle and more cusps on the lateral radular teeth ( Fig. 2 ; for comparison, see Giusti & Pezzoli 1980; Boeters et al. 2014). The new genus differs from the closely related genus Kerkia by its smaller shell, absence of lobes on the inner edge of the penis, a smaller bursa copulatrix, a more globular seminal receptacle and V-shaped rectum (see Radoman 1978; Bodon et al. 2001). Mean COI sequence divergence for Docleiana Delicado & Pešić gen. nov. was 14.5% with Arganiella and 12.3% with Kerkia .

Figures

Fig. 2. Shells, operculum and radulae of Docleiana tabanensis (Boeters, Glöer & Pešić, 2014) (UGSB 18847). A–C. Shells. D–E. Operculum (D = inner side; E = outer side). F. Protoconch. G–I. Radulae. G. Portion of radula ribbon. H. Central radular teeth. I. Inner and outer marginal teeth.