Contribution to the morphology of the Bulgarian stygobiont Truncatelloidea (Caenogastropoda)

Dilian Georgiev

Department of Ecology and Environmental Conservation, University of Plovdiv, Tzar Assen St. 24, BG-4000 Plovdiv, Bulgaria

Artur Osikowski

Department of Animal Anatomy, Institute of Veterinary Science, University of Agriculture in Cracow, Al. Mickiewicza 24/28, 30-059 Cracow, Poland

Sebastian Hofman

Department of Comparative Anatomy, Institute of Zoology, Jagiellonian University, Gronostajowa 9, 30-387 Cracow, Poland

Aleksandra Rysiewska

Department of Malacology, Institute of Zoology, Jagiellonian University, Gronostajowa 9, 30-387 Cracow, Poland

Andrzej Falniowski, e-mail:

Department of Malacology, Institute of Zoology, Jagiellonian University, Gronostajowa 9, 30-387 Cracow, Poland

The paper deals with morphology of the representatives of an entirely stygobiont, molecularly distinct and ancient clade of Bulgarian Truncatelloidea. Ten nominal species of seven genera (two of them new: Devetakiola Georgiev and Stoyanovia Georgiev) are analysed; six of them (except four Pontobelgrandiella species) are re-described. The knowledge of subterranean stygobiont gastropods is still limited; cave-dwelling species are mostly known only from empty shells found on the surface. The study includes all the Bulgarian stygobiont truncatelloideans known not only from empty shells. Their shells, soft part pigmentation, female reproductive organs and penes are presented. The results are compared with fragmentary data from the literature

Key words
Hydrobiidae; stygobiont; new genus; shell; pigmentation; reproductive organs; Bulgaria

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Folia Malacologica (2017) 25: 15-25
First published on-line: 2017-02-24 00:00:00
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