Zospeum bucculentum Inäbnit, Jochum & Neubert, 2019

Inäbnit, Thomas, Jochum, Adrienne, Kampschulte, Marian, Martels, Gunhild, Ruthensteiner, Bernhard, Slapnik, Rajko, Nesselhauf, Claudia & Neubert, Eike, 2019, An integrative taxonomic study reveals carychiid microsnails of the troglobitic genus Zospeum in the Eastern and Dinaric Alps (Gastropoda, Ellobioidea, Carychiinae), Organisms Diversity & Evolution 19 (2), pp. 135-177 : 163-164

Zospeum bucculentum Inäbnit, Jochum & Neubert n. sp.

Figure 8k–o

Type specimens Holotype NMBE 548793 , Pivnica špilja, 9.3.2009, leg. Rade; paratypes: NMBE 553339 /1, Pivnica špilja, 5.6.2009, leg. Cvitanovic; NMBE 553346 /1, Pivnica špilja, 18.3.2009, leg. Cvitanovic; NMBE 553340 /3, Pivnica špilja, 18.3.2009, leg. Lukic; NMBE 553351 /1 (ex AJC 2306 ), Pivnica špilja, 18.3.2009; leg. Rade.

Specimens examined Slovenia: NMBE 548796 /3, Pivnica špilja, 5.6.2009, leg. Cvitanovic ; NMBE 548814 /4, Jama na Škrilama , 20.3.2009, leg. Ozimec ; NMBE 548788 /2, Vrelić špilja, 12.9.2009, leg. Cvitanovic ; NMBE 553338 /1, Vrelić špilja, 12.9.2009, leg. Komericki ; NMBE 553341 /6, Zvonečka II, 17.9.2009, leg. Rade ; NMBE 553342 /1, Zvonečka II, 19.3.2009, leg. Rade ; NMBE 553347 /10, Zvonečka II, 6.6.2009, leg. Lukic ; NMBE553349 /4, Zvonečka II, 19.3.2009, leg. Cvitanovic ; NMBE 553350 /1, Zvonečka II, 19.3.2009, leg. Rade ; NMBE 553343 /1, Jama Đot , 6.6.2009, leg. Ozimec ; NMBE 553344 /2, Jama Đot , 6.6.2009 , Cvitanovic ; NMBE 553345 /1, Jama Đot , 6.6.2009, leg. Ozimec ; NMBE 553348 /1, Jama Đot , 20.3.2009, leg. Bedek ; NMBE 548801 , Jama na Škrilama , 20.3.2009, leg. Ozimec & Rade ; NMBE 548806 , Vrelic špilja, 12.9.2009, leg. Cvitanovic.

Diagnosis Shell ca. 1.8 mm, conic, transparent, peristome roundish to oval, with a straight or rounded parietal shield, columella with a parietalis and a weak columellaris.

Measurements (n = 41): sh: 1.54–2.06 mm (mean: 1.808 ± 0.122 mm); sw: 1–1.4 mm (mean: 1.186 ± 0.066 mm); ah: 0.73–1.09 mm (mean: 0.947 ± 0.062 mm); aw: 0.7–0.86 mm (mean: 0.773 ± 0.037 mm); number of whorls: 4.75–4.75 (mean: 5.146 ± 0.216).

Description Shell conical, translucent when fresh; on average, greatly variable, taller and more slender than its relatives (especially in the north of its range and close to that of Z. robustum ); whorl often slightly shouldered, sometimes with an obtuse keel; aperture taller than wide, especially pronounced in shells of the northernmost cave (Pivnica špilja), but hardly pronounced in shells from Jama na Škrilama; parietal shield well-differentiated from the lip, its margin usually slightly convex; parietalis present in the aperture with varying prominence, its size increasing until reaching its maximum at half a whorl into the shell; columellaris either present in the aperture, starting just behind the aperture or absent; if present, rapidly decreasing in size within half a whorl; columella sometimes thickened from just below the parietalis down almost to the base, forming a frequently subdivided bump incorporating the columellaris (when present).

Not really separable from other smooth-shelled species within the Z. frauenfeldii clade (such as Z. frauenfeldii , Z. pagodulum , Z. robustum ), though generally larger, with a more variable whorl and aperture shape.

Etymology Named for the large aperture frequently observed in specimens from the Locus typicus (lat.: bucculentus: having a large mouth).

Distribution (Supplementary Fig. S12) Endemic to the northwestern part of the Karlovac region, Croatia. Genetic records are from three caves: Pivnica špilja ( Fig. 8m ), Jama na Škrilama ( Fig. 8o ) and Vrelić špilja ( Fig. 8n ). Nonmolecularly-assessed specimens from Zvonečka II ( Fig. 8 k ) and Jama Đot ( Fig. 8l ) are morphologically considered to belong to this species.

Figures

Fig. 8 (a–e) Zospeum frauenfeldii, (a1–2) NMBE 553388, Podpeška Jama, sh: 1.982 mm. — (b1–2) NHMW 71882, Podpeška Jama, sh: 1.986 mm. — (c1–2) Paratype of Z. frauenfeldii osolei, MCSMNH 6835, Osoletova jama, sh: 2.01 mm; (d1–2) Paratype of Z. frauenfeldii osolei, ditto, sh: 1.805 mm. — (e1–2) NMBE 548795, Hrustovača špilja, sh: 1.494 mm. —(f–j) Zospeum subobesum, (f1–2) Syntype, MCSMNH 2083, Tounjčica, sh: 1.718 mm. — (g1–2) NMBE 553326, Tounjčica, sh: 1.655 mm. — (h) NMBE 553323, Sustav Đula Medvedica, sh: 1.637 mm. — (i) NMBE 553322, Jama ispod heliodroma, sh: 1.35 mm.