A new species of freshwater amphipod genus Gammarus (Amphipoda: Gammaridae) from Tajikistan (Pamir Mountains)Новый вид пресноводных амфипод рода Gammarus (Amphipoda: Gammaridae) из Таджикистана (Памир)

摘要

A new species of freshwater amphi-pod; Gammarus martynovi sp.n., from a small thermal spring in the headwaters of a small tributary of the Panj River in Gorno-Badakhshan Autonomous Region of Tajikistan is described based on morphological and moleculargenetic data. The new species belongs to the "Gammarus lacustris" species group, but can be clearly separated from other species by the combination of the following features: accessory flagellum of Al with less than 3 segments (the last is short); dactyli of Pp3-7 almost straight, with a short unguis; posterior margin of P7 straight in distal (2/3) part, with setae; U3 with bristles (plumose setae) and simple setae on edges of both branches; telson lobe with 1-2 apical spines; dorsal setae on urosomites shorter than spines, while distal setae on telson lobes much longer than spines; and 3 retinacules on P13. Moreover, this is the first Gammarus species described from Amu Darya basin in the territory of Tajikistan in Pamir Mountains.