Renea nemethi, Páll-Gergely & Grego, 2022

Páll-Gergely, Barna & Grego, Jozef, 2022, A Georgian and an Iranian new species of Renea G. Nevill, 1880 enormously extend the genus’s distribution (Gastropoda: Caenogastropoda: Aciculidae), Zootaxa 5188 (6), pp. 596-600 : 598-599

Renea nemethi n. sp.

( Fig. 3 )

Type material. Holotype: 1 dry shell, IRAN: Gilan Province: Mt. Talesh, side Valley 24 km from Asalam toward Khalkhal , 1300 m a.s.l., 37°39.583’N, 48°39.733’E, leg. L. Németh, 10–11 June 1999 ( HNHM 105328 ) . Paratype: 1 shell, same data as for holotype (coll. JG).

Diagnosis. A slender conical Renea species with relatively ca. 20–22, low ribs above aperture, a shallow suture, distinct spiral striation, and a strong angularis that runs on ca. half parietal callus.

Description. Shell slender conical with moderately pointed apex, light brownish, with ca, 5.5 convex whorls separated by shallow suture. Protoconch smooth, glossy, protoconch-teleoconch boundary not clearly discernible, ribbing and spiral striation starts after ca. 1–1.25 whorls. Teleoconch ribbed, ribs low, equidistant (although higher and more widely-spaced on last ca. quarter whorl), with ca. 20–22 ribs above aperture in apertural view. Fine spiral striation present on entire teleoconch. Apertural rim asymmetrically arched in lateral view: its upper part leans slightly deeper backwards than lower part.A sinulus not clearly marked, parieto-palatal junction pointed. Upper part of palatal region nearly straight or even concave resulting in an almost quadrangular aperture shape. Neck bulge missing. Peristome and angularis light brown, do not differ from other parts of teleoconch in colour, overall thin, not expanded on palatal part, but slightly expanded on basal and columellar area, where it covers umbilicus. Parietal callus visible, it is the direct continuation of columellar peristome without any interruption. Angularis strong, pointed, elongated triangular, situated on the anterior edge of parietal callus, starts ca. at middle of parietal callus and gradually increases towards parieto-palatal junction until it reaches its maximal height. Between highest point of angularis and palatal wall there is a narrow channel with much weaker parietal callus (even ribs of body whorls visible). Angularis continues inside aperture as a slight, gradually weakening angular lamella. Umbilicus is covered by reflected peristome.

Measurements (in mm). SH = 3.1–3.2, SW = 1.3 (n = 2).

Differential diagnosis. The shell is slender conical as most other Renea species, but the shell width/shell height is higher than that of other Southern European Renea , which are more elongate, conical or cylindrical. Moreover, the strong angularis that runs along the parietal callus is only present in R. caucasica n. sp. Renea caucasica n. sp. is larger, have stronger (more elevated), and more widely-spaced ribs, lack the spiral striation between ribs, has a deeper suture, and the palatal part of the aperture is more rounded, whereas it is straight or slightly concave in R. nemethi n. sp.

Etymology. This species is dedicated to and named after our friend, László Németh (Budapest), who collected this new species.

Figures

FIGURE 3. Renea nemethi n. sp., holotype. Photos: B. Páll-Gergely.