Bythinella kastanolongosensis, Glöer & Pešić, 2020

Glöer, Peter & Pešić, Vladimir, 2020, Two new species of the genus Bythinella Moquin-Tandona, 1856 from the Greek island of Evia (Gastropoda: Bythinellidae), Ecologica Montenegrina 36, pp. 1-5 : 2-3

Bythinella kastanolongosensis n. sp.

https://zoobank.org/ urn:lsid:zoobank.org:act:A6B46268-5A30-4100-A33F-F08B7F28ABFB

Figs 6-8

Material examined — Holotype ( ZMH140809 ): shell height 3.1 mm, width 1.8 mm; paratypes: 96 specimens in isopropanol ( ZMH140810 ), 16 specimens coll. Glöer.

Type locality — Greece, Evia Island , the region of Mount Ochi, GR 15 Kastanolongos, helocrenic spring, 38°3'8.72"N, 24°28'15.83"E, 01.07.2007 leg. Pešić.

Etymology — Named after the beautiful chestnut tree forest (“Kastanolongos”) on the slopes of Mount Ochi ("Oche") where the locus typicus of the new species is located.

Description

Shell — Cylindrical with 4.5 slightly convex whorls with a deep suture. The body whorl has a straight vertical tangent line. The aperture is ovate, slightly angled at the top. The peristome is sharp with a brown periostracum. The umbilicus is closed. The shell is 2.8-3.1 mm high and 1.8-1.9 mm broad.

Animal — The head is light-brown with a white border.

Anatomy — The penis is much shorter than the penial appendix ( Fig. 7 ). Tubular gland thin at the proximal end, broader at the distal part, with four half-loops.

Differentiating characters — The new species resembles Bythinella charpentieri . The latter species was recently redescribed by Georgiev & Glöer (2020) on the basis of a syntype material from Hymettus, Attica. The shell of B. charpentieri is elongated conical and not cylindrical as in B. kastanolongosensis n. sp. Moreover the tangent line of the body whorl in B. charpentieri is not straight as in the new species ( Fig. 2 ). The shell of B. dimitrosensis , a species known from southern part of the island of Evia, is ovate and the species is smaller than B. kastanolongosensis n. sp.

Due to its size the new species is similar to B. reuselaarsi n. sp. (see there for further discussion).

Habitat — Specimens were collected from the stones in a small seepage spring in old-growth chestnut wood ( Fig. 11 ).

Distribution — Greece; only known from the type locality in the southern part of the island of Evia.

Figures

Figures 2-10. 2: Bythinella charpentieri (lectotype), 3-5: B. dimitrosensis Glöer & Reuselaars, 2020a, 4: B. dimitrosensis from Evia Island, the region of Mount Ochi, Metochi spring; 5: B. dimitrosensis from Evia Island, the region of Mount Ochi, spring near Lenosei village; 6: B. kastanolongosensis n. sp. (holotype), 7: penis with tubular gland, 8: B. kastanolongosensis n. sp. (paratype), 9: B. reuselaarsi n. sp., 10: penis with tubular gland.

Figures 11-12. Photographs of sampling site. 11: GR15 heleocrene spring in old-growth chestnut wood, Kastanolongos, locus typicus of Bythinella kastanolongosensis n. sp. 12: GR4 limnocrene spring near Melissonas, locus typicus of B. reuselaarsi n. sp. Photos: V. Pešić.