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Contents 27 2 2009 Final Version.Indd > Mollusca 27 (2) 2009 123 123 – 136 © Museum für Tierkunde Dresden, ISSN 1864-5127, 25.11.2009 New Rissooidea from Bulgaria (Gastropoda: Rissooidea) PETER GLÖER 1 & DILIAN GEORGIEV 2 1 Schulstraße 3, D-25491 Hetlingen, Germany [email protected] 2 Department of Ecology and Environmental Conservation, University of Plovdiv Tzar Assen Str. 24, BG-4000 Plovdiv, Bulgaria [email protected] Received on July 20, 2009, accepted on August 13, 2009. Published online at www.mollusca-journal.de > Abstract For the fi rst time a troglobiont species of the genus Bythinella and a representative of the genus Radomaniola have been found in Bulgaria. In addition, three more Bythinella spp., two new Grossuana spp. and three new Belgrandiella spp. could be introduced. These species are here described as new: Bythinella markovi n. sp., B. ravnogorica n. sp., B. walkeri n. sp., B. srednogorica n. sp., Belgrandiella dobrostanica n. sp., B. bachkovoensis n. sp., B. zagoraensis n. sp., Radomaniola bul- garica n. sp., Grossuana thracica n. sp., and G. angeltsekovi n. sp. Information about the habitat and photos of the type lo cal ities are also presented. > Kurzfassung Neue Hydrobiidae aus Bulgarien (Gastropoda: Rissooidea). – Erstmalig wurden eine troglobionte Bythinella und ein Vertreter der Gattung Radomaniola in Bulgarien gefunden. Zusätzlich zu drei weiteren Bythinella-Arten, konnten drei neue Belgrandiella-Arten sowie zwei neue Grossuana spp. vorgestellt werden. Die Arten werden hier neu beschrieben als: Bythinella markovi n. sp., B. ravnogorica n. sp., B. walkeri n. sp., B. srednogorica, Belgrandiella dobrostanica n. sp., B. bach kovoensis n. sp., B. zagoraensis n. sp., Radomaniola bulgarica n. sp.,Grossuana thracica n. sp. und G. angeltsekovi n. sp. Informationen zum Habitat und Photos der Typuslokalitäten werden ebenfalls präsentiert. > Key words Bulgaria, Hydrobiidae, Bythinella markovi n. sp., Bythinella ravnogorica n. sp., Bythinella walkeri n. sp., Bythinella srednogorica n. sp., Belgrandiella dobrostanica n. sp., Belgrandiella bachkovoensis n. sp., Belgrandiella zagoraensis n. sp., Radomaniola bulgarica n. sp., Grossuana thracica n. sp., Grossuana angeltsekovi n. sp. Introduction The hydrobiid species of Bulgaria have as yet not been HUBENOV (2007) and ZETTLER (2008) mentioned studied thoroughly, although the fi rst publication on Grossuana codreanui (Grossu, 1946) as a regional en- molluscs, due to Frivaldzky, appeared in 1835 (cited demic species (northern Black Sea coast), while AN- after WOHLBEREDT 1911: 169). WOHLBEREDT (1911) gave GELOV (2000: 12) and RADOMAN (1983: 58–59, men- a detailed summary of the literature prior to 1911, and tioned as G. serbica codreanui) believed that it was he listed the species described by the said authors. widely distributed in the Balkans. In addition ANGELOV He and his predecessors did not report on any small (2000) and HUBENOV (2007) listed some small hydro- hydrobiid species and dealt predominantly with ter- biid species of the genus groups Belgrandiella and restrial snails. In the 20th century WAGNER (1927: 281) Pontobelgrandiella from Bulgaria, which are locally thoroughly studied the Hydrobiidae for the fi rst time. endemic. He reported on some Pseudamnicola spp., of which The species we discuss here belong to the genus only P. consociella euxina Wohlberedt, 1927 occurs groups Bythinella Moquin-Tandon, 1855, Belgrandiel- in Bulgaria (loc. typ. near Varna), however, RADOMAN la Wagner, 1927, Radomaniola Szarowska, 2006 (for- (1983: 58–59) mentioned this species as belonging to merly Orientalina Radoman, 1978), and Grossuana the genus Adriohydrobia Radoman, 1973. Radoman, 1973. 124 GLÖER & GEORGIEV: New Rissooidea from Bulgaria Fig. 1. The sampling sites of the Hydrobiidae of Bulgaria. Bythinella (red dot): 1: B. markovi n. sp. (Gargina Dupka Cave); 2: B. rav no gorica n. sp. (Ravnogor); 3: B. walkeri n. sp. (Rila Mts); 4: B. srednogorica n. sp.; Radomaniola (blue dot): 1: R. bul- garica n. sp., 2: R. rhodopensis n. sp.; – Grossuana (green dot): 1: G. thracica n. sp. (Chirpan Bunar Cave); 2–4: G. angeltsekovi n. sp. (2: Bachkovo; 3: Pavelsko; 4: Musomishta), – Belgrandiella (yellow dot): 1: B. dobrostanica n. sp. (Gargina Dupka Cave), 2: B. bachkovoensis n. sp. (Bachkovo), 3: Belgrandiella zagoraensis n. sp. (Stara Zagora). The species of the genus Bythinella are widely dis- Species determination in the genus Bythinella is tributed from the uplands of Germany (BOETERS 1981) problematic, because species that are anatomically and Poland (FALNIOWSKI 1987) on the northern border, distinct cannot be distinguished genetically (B. robi- to the Mediterranean and Northern Africa (KRISTENSEN ciana (Clessin, 1890) vs. B. opaca (Gallenstein, 1848) 1985) in the South. The eastern border is the Ukraine HAASE et al. (2007)). On the other hand, species that (SON 2009), and Turkey limits the distribution in the differ only by the marginal teeth of the radula, a con- S-East (YILDIRIM 1999, 2006). stant feature, (B. angelitae Haase, Wilke & Mildner, Species of the genus Bythinella occur predomi- 2007 vs. B. opaca) can be distinguished by sequenc- nantly in springs and spring-fed brooks, and as they ing CO1 fragments (HAASE et. al. 2007). Thus it is un- are photophobic, they live on the undersides of leaves certain whether B. opaca is distributed in Bulgaria or or submerged wood, in the interstitial (BOETERS 1998), whether it is a distinct species such as B. angelitae, or, exceptionally, also in caves (Bythinella padiraci which can only be distinguished genetically or by the Locard, 1902), and prefer temperatures of 6–10° C. radula from B. opaca. From Bulgaria only three Bythinella spp. are known The Belgrandiella species listed by ANGELOV (2000) until now: B. austriaca (Frauenfeld, 1856), B. hans- only occur in the Stara Planina Mts and Kraishte Mts. boetersi Glöer & Pesič 2006, and B. cf. opaca (Gal- From the Rhodopes Mts, where we found the new spe- lenstein, 1848) (GEORGIEV & STOYCHEVA 2008). By- cies, Belgrandiella spp. are unknown so far. The new thinella austriaca has been listed by ANGELOV (2000) species do not belong to the genus Pontobelgrandiella and HUBENOV (2007) as well, but has not been men- Radoman, 1978, because the penis of Pontobelgran- tioned by RADOMAN (1983), who was the outstanding diella has two small outgrowths on the left side, which expert on the Hydrobiidae of the Balkans. GEORGIEV & could not be found in the Belgrandiella spp. which are STOYCHEVA (2008) already put in question the occur- discussed here. rence of B. austriaca in Bulgaria. Mollusca 27 (2) 2009 125 Species of the genus Radomaniola and Gros- suana have not been mentioned by ANGELOV (2000) from Bulgaria, except Grossuana codreanui (Grossu, 1946), listed as a Pseudamnicola. Species of the genus Radomaniola and Grossuana, which are discussed here, are problematic concerning their classifi cation. SZAROWSKA et al. (2007) discussed the species Grossuana codreanui (Grossu, 1846), G. serbica (Radoman, 1973), Belgrandiella haesitans (Westerlund, 1881), and Orientalina delphica Rado- man, 1973, considering their generic position, and they found that all these species, however, belong to the genus Grossuana. This paper is intended (i) to improve the knowledge concerning the Hydrobiidae in Bulgaria, and (ii) to describe the new species Bythinella markovi n. sp., B. ravnogorica n. sp., B. walkeri n. sp., B. srednogorica, Belgrandiella dobrostanica n. sp., B. bachkovoensis n. sp., B. zagoraensis n. sp., Radomaniola bulgarica n. sp., Grossuana thracica n. sp., and G. angeltsekovi n. sp. Material and methods In 2008–2009 D. Georgiev collected freshwater mol- luscs in Bulgaria. The snails were collected by hand and with a sieve from the waters. The samples were Fig. 2. The type locality of Bythinella markovi n. sp. (below: put into 75% ethanol. The dissections and measure- inside the cave). ments of the genital organs and the shells were carried out using a stereo microscope (Zeiss); the photographs were made with a digital camera system (Leica R8). Paratypes: 2 specimens ZMH 51443, 3 juvenile spec- Of every species we dissected three specimens to imens for DNA sequencing in the University of Gies- be sure that the morphology of the penis and the fl a- sen (Prof. Wilke), rest in collection Glöer. gellum is a constant feature. Locus typicus: In the stream of Gargina Dupka cave (=Crow Whole cave), near the village of Mostovo, the northern slope of the Rhodopes Mts, Southern Bulgar- ia, N 41° 51’ 00.4’’ E 24° 55’ 57.1’’, 915 m alt. Results Etymology: Named after Tanyo Markov, a speleolo- gist who led D. Georgiev to this cave. Description: The horn-coloured shell is cylindrical New samples, collected in the years 2008 and 2009 by and consists of 3.5–4 whorls, which are regularly con- D. Georgiev, revealed some new species of the Hydro- vex with a deep suture. The surface is silky and fi nely biidae in Bulgaria. striated. The apex is obtuse, the umbilicus closed. The aperture is oval with a sharp periostome, which is slightly thickened at the columella. Shell height 2–2.2 mm, width 1.2–1.3 mm, aperture height to shell height Genus: Bythinella Moquin-Tandon, 1856 0.47–0.50. Animal: The mantle is white. The penis is as long as Bythinella markovi n. sp. the penial appendix (Fig. 3.3), the fl agellum is regular- ly broad, at the proximal end slightly thickened (Fig. Material examined: 17 ex. from type locality, col- 3.4). lected 26.02.2009 by D. Georgiev. Distribution: Gargina Dupka cave is a part of the Holotype: Shell height 2.15 mm, width 1.25 mm, very large Dobrostan karst system that has a total ZMH 51442. of 77 registered caves, and adjacent areas of the vil- 126 GLÖER & GEORGIEV: New Rissooidea from Bulgaria 4 × Fig. 3. Bythinella markovi n. sp. 1: photographed in ethanol (holotype), 2: paratype, 3: penial appendix with fl agellum (penis cut), 4: penis in situ. – fl = fl agellum, p = penis, pa = penial appendix. lages as Mostovo, Dobrostan, Pavelsko, Borovo, and Recommendations for conservation measures: Not- Orehovo (PETROV & STOEV 2007).
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