Sinoennea sutchariti Páll-Gergely & Hunyadi, 2020

Páll-Gergely, Barna, Reischütz, Alexander, Maassen, Wim J. M., Grego, Jozef & Hunyadi, András, 2020, New taxa of Diapheridae Panha & Naggs in Sutcharit et al., 2010 from Laos and Thailand (Gastropoda: Eupulmonata: Stylommatophora), Raffles Bulletin of Zoology 68, pp. 1-13 : 9

Sinoennea sutchariti Páll-Gergely & Hunyadi , new species

( Figs. 4 A–B, 6F)

Type material. Holotype (1 shell, H: 3.69 mm, D: 1.77 mm; Fig. 4A ) ( HNHM 103486 ), Thailand, Chiang Mai Province, 5 km N of Chiang Dao, around Wat Tham Chiang Dao, 450 m a.s.l., 19°23.628′N, 98°55.711′E, locality code: 2015/05, coll. A. Hunyadi, 07 February 2015; 5 paratypes ( HA/5 ), same data as holotype; 4 paratypes ( HA/4 ), Thailand, Chiang Mai Province, NE side of Doi Chiang Dao , 2 km NW of Wat Tham Chiang Dao, 840 m a.s.l., 19°24.016′N, 98°54.680′E, locality code: 2015/6, coll. A. Hunyadi, 07 February 2015; 2 paratypes ( CUMZ 5136 ), same data as preceding.

Diagnosis. A medium-sized species with strongly ribbed, ovoid shell, strongly bulging whorls, strongly expanding

parietal callus, relatively weak apertural barriers, and closed umbilicus.

Description. Shell off-white, probably not translucent even if fresh, ovoid with pointed apex. Entire shell with 7.25–7.5 whorls. Protoconch consisting of 1.75 whorls, glossy, with some signs of fine wrinkles near suture. Shell regularly and rather strongly ribbed. Individual ribs with blunt back. Ribs getting weaker just behind peristome. Whorls strongly bulging with very deep suture. Aperture rounded with strongly expanded parietal callus, which reaches and even exceeds half of preceding whorl (“smeared” onto preceding whorl). Apertural dentition four-fold. Parietal lamella strong, its outer end slightly bent in direction of the palatal wall. Change between inner and outer part of parietal lamella not abrupt, relatively smooth. Inner portion relatively straight. Sinulus relatively wide, oval, not well isolated (tips of parietal lamella and upper lablar denticle situated relatively far from each other). Palatal wall with an upper and a lower denticle, upper one inconspicuous and looks like only a slight swelling on thickened peristome, inner one small, pointed, situated deeper and lower. Columellar tooth deeply situated, lamellalike, long, sharp, almost vertical (parallel with shell axis), although its outer end situated more anteriorly than its inner end. Peristome strongly thickened and expanded, not or very slightly reflected. Basal swelling very slight, nearly invisible, situated in normal distance from peristome, practically no depression on any of its sides. Umbilicus entirely closed.

Measurements. H = 3.06–3.69, D = 1.7–1.77 mm (smallest and largest specimens measured).

Differential diagnosis. Sinoennea sutchariti , new species, differs from S. prima Panha & J. B. Burch, 1999 , by the ovoid shell, more bulging whorls, weaker lower palatal (lablar) denticle, and more elongate parietal callus. Sinoennea lizae , which is known from northern Laos, differs from the new species by the more slender shell, less bulging whorls, comparatively narrower aperture, and the strong periumbilical keel.

Etymology. This new species is dedicated to our much valued friend, Dr. Chirasak Sutcharit (Chulalongkorn University, Thailand), an outstanding malacologist who contributed to our knowledge of Southeast Asian land snails with excellent taxonomic revisions.

Figures

Fig. 4. New Sinoennea Kobelt, 1904, species from Thailand. A, holotype of Sinoennea sutchariti Páll-Gergely & Hunyadi, new species; B, subadult paratype of S. sutchariti, new species; C, juvenile shell (not paratype) of Sinoennea panhai Páll-Gergely & Hunyadi, new species; D, aperture of a paratype of S. panhai; E, holotype of S. panhai. Scale bar represents 1 mm.