Grossuana durrelli, Georgiev & Glöer, 2018

Georgiev, Dilian & Glöer, Peter, 2018, A new species of Grossuana Radoman, 1973 (Caenogastropoda: Truncatelloidea) from Corfu Island (Greece), Ecologica Montenegrina 19, pp. 22-25 : 23-24

Grossuana durrelli n. sp.

Type materials: Holotype: shell height 2.3 mm, width 1.5 mm, from type locality ( ZMH 87654 ).

Paratypes: 10 specimens in ethanol (( ZMH 87655 ), 7 specimens in coll. Glöer, 5 specimens in coll. Georgiev.

Type locality: Greece, N Corfu Island, Klimatia village, Kato vrisi spring; N 394428,3 E194652.0, 191 m alt., 28.07.2018 Georgiev leg.

Etymology: Named in honour to Gelard Durrel (British naturalist, conservationist, zookeeper, writer and television presenter) who used to live on Corfu and inspired the senior author with his books.

Description: Shell ovoid conical, 4-4.5 slightly convex whorls with a deep suture. Lateral line nearly straight to slightly convex, columellar border thickened, umbilicus closed. Operculum red. Shell height 1.9-2.4 mm, 1.2-1.5 mm width.

Penis with two small outgrowths, hardly visible ( fig. 7 ). Distal part of the penis tapered, basis broad.

Differentiating features: In the region of Corfu no Grossuana spp. are known yet (Falniowski et al. 2015) thus we compare it with all Grossuana spp. from Grecce. G. durrelii n. sp. has more whorls and is more conical than G. tembii Boeters, Glöer & Falniowski 2018 , in addition the penis of G. tembii has a dark spot at the distal part, G. durrelli has not. The Grossuana spp. which occur in Macedonia (N Greece) are more globular ( Glöer et al. 2018), as well as G. marginata (Westerlund, 1881) from Euboea. G. delphica is smaller than G. durrelii n. sp. and the periostome is not thickened at the columella ( Radoman 1983, pl. 2, fig. 31). In 2013 Georgiev found Grossuana angeltskovi Glöer & Georgiev, 2009 in N-Greece, but this species is more globular than G. durrelli n. sp. and the penis of it has a dark spot.

Distribution: Only known from type locality.

Habitat: Living specimens were found on small stones, gravel and sand in running water of a ditch just below the spring. The area of the spring is a karst terrain rich on limestone formations (it is close to the Anthropograva Cave).

Figures

Figures 4-7. Grossuana durrelli n. sp. 4: holotype, 5-6: paratypes, 7: penis.