Cochlostoma Jan, 1830 revised: an overview of the subgenus Turritus Westerlund, 1883 and its species (Caenogastropoda, Cochlostomatidae) Author Zallot, Enrico 365E17AD-6938-4364-A526-F1BDA2663E10 Per Ligont 1, 33070 Budoia, Italy. ezallot@gmail.com Author Kamchev, Panche 9FA2BE01-3355-4340-B57C-9E2841D5E4C2 Naturalis Biodiversity Center, Darwinweg 2, 2333 CR Leiden, the Netherlands. panekamchev@gmail.com Author Schilthuizen, Menno 683D0AB7-CDD8-4FAA-94B6-436F3BFB8873 Naturalis Biodiversity Center, Darwinweg 2, 2333 CR Leiden, the Netherlands. & Taxon Expeditions, Rembrandtstraat 20, 2311 VW Leiden, the Netherlands. menno.schilthuizen@naturalis.nl Author Fehér, Zoltán E801EC76-8B1E-450B-993E-BBBE57C00EA9 WWF Hungary, Álmos vezér útja 69 / A, 1141 Budapest, Hungary. feher.zoltan.nhmus@gmail.com Author Mattia, Willy De C74A049D-9D7B-4A1F-878B-5BDFD104219F Central Research Laboratories, Burgring 7, 1010, Vienna, Austria; Department of Evolutionary Biology, University of Vienna, Djerassiplatz 1, 1030, Vienna, Austria. wdemattia@gmail.com Author Gittenberger, Edmund D786C279-FC92-4D08-AF16-F79A9705E0AE Naturalis Biodiversity Center, P. O. Box 9517, 2300 RA Leiden, the Netherlands. egittenberger@yahoo.com text European Journal of Taxonomy 2024 2024-03-21 927 1 163 https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2475/11013 journal article 10.5852/ejt.2024.927.2475 2118-9773 10853688 B6E43365-FACA-49BA-8CCD-77E4BF8F0016 Cochlostoma ( T. ) stossichi ( Hirc, 1881 ) Figs 73F , 82 (purple dots), 87–88 Pomatias stossichi Hirc, 1881: 522 . Syntypes CROATIA • probably ♂ ; “ Pomatias Stossichii , Clessin , 1880 .XIII.33. Orig. der Hirc’schen arbeit, Ponikve bei Buccari ”; NHMWno number • “ nanus West. var. stossichi Hirc, Buccari bei Fiume Croatien ”; Stossich leg.; Sep. 1882 ; ZMB 170.256 , Other specimens CROATIA • 2- 2 km NNW of Meja ; 45.3070° N , 14.5871° E ; 1999; De Mattia leg.; WdM 1240 . Type locality CROATIA • 1- Primorje-Gorski Kotar County, Ponikve, Bakar. Description SHELL . Closely spaced ribletss on last part of protonconch. Teleoconch spotless, ribs rounded, irregular in size and shape and not prominent, disappearing toward aperture. Moderately developed lip with slightly bent columellar lobe hiding almost completely umbilicus. MEASUREMENTS . 5 ♀♀ : whorls=6.8–8.1, H = 6–7.3 mm , H/W=2.14–2.64, roundness =0.09–0.15, ribs incl.= 48–56°, apert. incl.= 21–24°, ribs/mm 1 st wh.= 9–9, ribs/mm 4 th wh.=8–14. FEMALE GENITAL ORGANS . As in C. ( T. ) nanum . Fig. 87. Syntypes of Cochlostoma ( T. ) stossichi ( Hirc, 1881 ) . A . ♂? (NHMW no number). B . ♀ (ZMB170.256). Note the not visible umbilicus in the specimen B. Remarks The species differs from C. ( T. ) elegans because it has either a hidden umbilicus or a narrow slit behind a barely curved columellar lobe (umbilicus wide and well visible in elegans ). Moreover, the ribbing is weaker in this species.