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Camachobathynella meghalayaensisn. gen., n. sp., the first Palearctic element of Bathynellacea (Eumalacostraca: Bathynellidae) from northeastern India

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A new bathynellacean, Camachobathynella meghalayaensisn. gen., n. sp., is described from a hyporheic habitat in Meghalaya, a northeastern Indian state. This is the first Palearctic bathynellacean from India. It has very little in common with the hitherto known tropical Bathynellidae Grobben, 1905 of India and other Gondwana landmasses, but it shows some close morphological relationships with the Palearctic members of the subfamily Bathynellinae Grobben, 1905. It has a unique of constellation of characters: antennule 7-segmented, with 5 setae on segment 7; antennary endopod 5-segmented and perpendicular to antennule, and exopod without medial seta; mandible sexually isomorphic with 3-segmented palp and distinct gnathobase; maxilla 4-segmented, setal formula 6-4-6-4; Th I-VII with 4-segmented endopod; male Th VIII penile region consisting of 3 lobes, none of them denticulate, basis armed with 2 setae on inner margin, exopod bent outwards and armed with 5 setae, and endopod absent; female Th VIII with large, biarticulate epipod, exopod and endopod 1-segmented, with 2 setae each; pleopod I 2-segmented, with 6 setae on distal segment; uropodal sympod with 5 equal spines; caudal furca with 4 spines; and pleotelson with 2 dorsal moderately strong setae. Of these characters, the male Th VIII lacking endopod and the caudal furca having only four spines can be considered the autapomorphies of the new genus within in the subfamily Bathynellinae. The position of the new taxon in Bathynellidae is discussed, and a brief note on its ecology and biogeography is also added.

Affiliations: 1: Department of Zoology, Acharya Nagarjuna University, Nagarjunanagar 522 510, India


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