A new gammaridean amphipod from the Lake District Region of Turkey: Gammarus deryae sp. nov.
In order to determine the distribution and
composition of freshwater amphipod species of the Lake District Region
of Turkey, detailed samplings were conducted between 1998 and 2001.
Among these materials, those from Pınar Pazarı and Yukarı Gökdere
villages (Isparta Province, Turkey) were studied in the present study.
Because of having different character combinations, the author believes
that they belong to a new species, Gammarus deryae sp. nov. The new species is a typical member of the Gammarus pulex-group
having setose third and fourth pereopod and uropod 3 where dense
plumose setae exist. Elevated urosomal segments and sharply pointed
third epimeral plate are the most distinct characters of the species. In
addition, the palp of right maxilla 1 has 1 seta on the outer margin.
These encountered characters are commonly observed in the G. pulex-group
but the combination of these characters is specific for the newly
identified species. All the extremities of the holotype male and
allotype female are illustrated and described in detail. The similar and
different morphological characters of the new species are compared with
those of related species.
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