TABLE 2 in Morpho-molecular studies suggest a new species from a transboundary river of Turkiye: Gammarus arasensis sp. nov. (Amphipoda: Gammaridae)

TABLE 2. Comparative morphological analysis of Gammarus arasensis sp. nov. and G. kischineffensis. CharacterGammarus arasensis sp. nov.G. kischineffensis (in Schellenberg, 1937)G. kischineffensis (in Karaman & Pinkster, 1977)Holotype male body length12.5 mm18 mmMaximum 17 mm observedEyesKidney-shapedSmall, kidney-shapedVariable in size from almost round to reniform.Antenna 1 lengthDistinctly shorter than half of body lengthA little longer than 1/3 of body lengthVariableAntenna 1 flagellum16–17 articlesNot specified22–33 articlesAntenna 2 gland coneLong, straight, almost reaching the distal end of peduncular article 3Not described (“weakly and shortly setose”)Short, half as long as the peduncular article 3Mandibular palp (article 3)1 group of B-setae. C-seta absent.Not described2 groups of B-setae. (C-seta not mentioned, implying absence)Pereopod 3 & 4 seta length (merus & carpus)Setae longer than the article diameter (P3), as long as the article diameter (P4).Very short setae; posterior margin of merus with “single groups of short bristles”.Setae at most as long as article diameter (P3), always shorter than article diameter (P4).Coxal plates 1–4Bear one long, simple seta on their inner surfaces.No mention of long inner setae.No mention of long inner setae.Epimeral plate 3Posterodistal corner slightly pointed.Posterodistal corner hardly produced, almost rectangular.Posterodistal corner varies from almost rectangular to moderately pointed.Uropod 3 (endopod/exopod ratio)~0.64 (Endopod 0.64x length of exopod)Similar to G. lacustris (implies well-setose exopod)Endopod ~0.75x (3/4) length of exopod. Exopod lacks setation on the lower half.