Laeocathaica hisanoi Pall-Gergely, 2022

Pall-Gergely, Barna, Hunyadi, Andras, Meng, Kaibaryer & Fekete, Judit, 2022, A review of the genus Laeocathaica Moellendorff, 1899 (Gastropoda, Pulmonata, Camaenidae), ZooKeys 1086, pp. 33-76 : 33

Laeocathaica hisanoi Pall-Gergely sp. nov.

Figure 20D

Type material.

Holotype China • S Kansu, China, coll. S. Hisano, 24.05.204, SMF 336708 (D: 11.6 mm, H: 5.2 mm) (Fig. 20D ). Paratype China • Same data as for holotype; SMF 363469.

Diagnosis.

A small Laeocathaica species with many (8.5) whorls, conical dorsal side, rounded body whorl and single, small basal tooth that is situated close to the columella.

Description.

Shell sinistral, depressed, dorsal side conical with protruding apex, body whorl shouldered; colour chalk white with a single brownish belt below shoulder; entire shell consists of 8.5 whorls, protoconch consists of 1.75-2 whorls, very finely granulose, conspicuously elevated compared to first teleoconch whorls; teleoconch with fine, irregular growth lines, without any notable sculpture, although both examined shells were corroded; last quarter whorl with slight subsutural furrow; aperture semilunar, very strongly oblique to shell axis; peristome sharp, very slightly expanded dorsally, with thickening situated behind peristome edge; basal tooth blunt, elongated, situated ca. at the middle of basal peristome; parietal callus inconspicuous, appears only as thick calcareous layer; umbilicus open, narrow, shows all whorl, with the last half of body whorl extremely widened, resulting in a “9” -shape.

Measurements (in mm): D: 11.5-11.6; H: 5.2-5.3 (n = 2).

Differential diagnosis.

The most similar species is L. polytyla , which is usually larger, has one whorl more, has a more elevated spire with a domed dorsal side, a rounded body whorl, and a comparatively smaller basal tooth situated closer to the columella.

Etymology.

This new species is named after S. Hisano, who collected the type material.

Distribution.

This new species is known from a single museum sample only, consisting of two shells.

Figures

Figure 20. Laeocathaica species A Laeocathaica polytyla Moellendorff, 1899, lectotype (SMF 9198) B Laeocathaica polytyla, 2016 / 78 C Laeocathaica polytyla, 2016 / 65 D Laeocathaica hisanoi sp. nov. (holotype, SMF 336708). Scale bar: 10 mm. All photographs: B. Pall-Gergely.