Citation: Gittenberger E, Leda P, Wangchuk J, Gyeltshen C, Stelbrink B (2020) The genera Erhaia and Tricula (Gastropoda, Rissooidea, Amnicolidae and Pomatiopsidae) in Bhutan and elsewhere in the eastern Himalaya. ZooKeys 929: 1-17. https://doi.
AbstractShells of the Rissooidea species that are known from Bhutan are characterized. Tricula montana is reported from that country for the first time. Two Erhaia species from Bhutan are described as new to science, viz. E. jannei sp. nov., and E. pelkiae sp. nov., The holotypes of the Erhaia species that were described from Nepal are figured with photographs for the first time and compared with the congeneric taxa from Bhutan and India. Erhaia nainitalensis is considered a senior synonym of E. chandeshwariensis. An identification key is presented for the Erhaia species of the Himalayan foothills.
A peer-reviewed open-access journalEdmund Gittenberger et al. / ZooKeys 929: 1-17 (2020)
The cosmopolitan slug Deroceras laeve (O. F. Müller) is reported from Bhutan for the first time, with the identity at one site confirmed through dissection. Here it was a minor pest of cabbage on a single farm at 2,780 m a.s.l. in north-western Bhutan. Two further, anatomically unconfirmed, records suggest that it is widespread in Bhutan. This, together with evidence that it is already widely distributed in nearby countries, suggests that it might have been in Bhutan for some time. Surveys are required to confirm its distribution and pest status in Bhutan, but current indications are that it is a very localised and occasional pest that can be readily managed through manual removal.
The species of two gastropod superfamilies, i.e. Pupilloidea and Enoidea, that have been recorded in Bhutan, are described and illustrated. Five families with ten species in total are dealt with. Three species are described as new to science, viz. Pupisoma (P.) paroense Gittenberger et Leda, n. sp., Pseudonapaeus occibhutanus Gittenberger, Gyeltshen et Sherub, n. sp., and Laevozebrinus parvus Gittenberger, Gyeltshen et Leda, n. sp. Distribution maps are presented for all the species. Some biogeographical considerations are added.
Samples of the genus Endothyrella from Bhutan are dealt with, starting from the modern review of this genus by Páll-Gergely et al. (2015). Four species are recognized, 3 of which are new to science: E. bhutanensis, E. spirostriata, and E. pemagatshel. The record of Endothyrella blanda nearly 100 km southeast of its well documented range in Sikkim, India, puts some isolated unconfirmed records from India in a new light. Apart from shell size and shape, the number of spiral rows of hairs and the structure of the parietal and palatal callosities on the shell wall turned out to be important for identification. The species were found at altitudes of 335-2300 m a.s.l. in the Indo-Malayan part of Bhutan.
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