Bensonella spinosa Gojšina, Hunyadi & Páll-Gergely, 2025

Bensonella spinosa Gojšina, Hunyadi & Páll-Gergely sp. nov.

Type material.

Holotype. Myanmar • 1 shell (SH: 2 mm, SW: 1.5 mm); Shan State, 5.7 km south-southwest from centre of Pinlaung, Wingabar Taung ; 20°4.152'N, 96°46.232'E; 1510 m a. s. l.; 04 Oct. 2018; A. Hunyadi, K. Okubo & J. U. Otani leg.; CUMZ 14445 View Materials GoogleMaps . Paratypes. Myanmar • 14 shells; same data as for holotype; coll. HA GoogleMaps .

Type locality.

Myanmar, Shan State, 5.7 km south-southwest from centre of Pinlaung, Wingabar Taung; 20°4.152'N, 96°46.232'E; 1510 m a. s. l.

Diagnosis.

Bensonella with triangular-conical, reddish-brown shell. Teleoconch fine, pasty, not spirally striated. All barriers and aperture surface around them very roughly spiniferous.

Description.

Shell triangular, slightly conical-ovoid, reddish brown, consisting of 5–5.5 convex, rounded whorls separated by a deep suture. Protoconch of ~ 1.5 whorls, finely pitted, showing very weak spiralling pattern, lighter than the rest of the shell but with no clearly visible boundary with the teleoconch. Teleoconch finely dimpled (pasty) and finely radially striated but without spiral striae. Last whorl adnate to the penultimate and very slightly ascending near the aperture (~ 5–10 ° compared to the shell axis), making the aperture profile weakly opisthocline to the shell axis. Peristome of the same colour as the rest of the shell, expanded and not reflected. Aperture equipped with numerous barriers. Parietal lamella is the strongest in the aperture, high but not curved, directed towards the palatal wall. Angular lamella slightly lower than the parietal but otherwise very similar, continuous. There are three main palatal plicae (upper palatal, interpalatal and lower palatal) and one additional small interpalatal plica situated below the stronger interpalatal and a lower palatal. Upper palatal as strong as the main interpalatal. Lower palatal plica is the strongest. Infrapalatal plica weak. Basal plica 2 × stronger than the infrapalatal. All palatal plicae are higher at their inner parts and sloping towards their outer parts. There is a strong palatal tubercle sitting on the palatal lip of the peristome, in front of the upper palatal plica. Peristome is distinctly sinuated behind this tubercle. Columellar lamella ~ 2 × stronger than the basal and positioned obliquely, directed towards the parietal lamella. Subcolumellar similar to the infrapalatal. Supracolumellar lamella similar to the subcolumellar. Infraparietal lamella strong as the columellar. All apertural barriers are very strongly spiniferous as well as the surface of the aperture around them. Sinulus small and well separated from the rest of the aperture due to the strong angular lamella. Umbilicus very narrow, dot like.

Differential diagnosis.

This species is most similar to B. plicidens from which it differs by the absence of spiral striation as well as spiniferous barriers and aperture surface (both smooth in B. plicidens ). Bensonella lakainguta , B. multihami and B. hooki all have more numerous and hooked apertural barriers and they are not spiniferous.

Measurements

(in mm, n = 5). SH = 1.81–2.14; SW = 1.37–1.5; AH = 0.66–0.79; AW = 0.63–0.75.

Etymology.

The specific epithet is due to the numerous spines in the aperture.

Distribution.

This species is known only from the type locality.