Table 1.

Comparison of some distinct characters of Echinogammarus özbeki sp. nov. with species of the genus Echinogammarus distributed in Türkiye.

Echinogammarusozbeki sp. nov.: a small species; urosome segments without elevation; inner surface of basis of pereopods 5–7 without setae; all extremities without curled setae; all extremities have sparse setae	Echinogammarusantalyae G. Karaman, 1971	Urosome segments elevated; exopod of uropod 3 with densely plumose setae; basis of pereopods 5–7 with some setal groups on inner surface
	Echinogammarusbaliki Özbek & Ustaoğlu, 2007	Exopod of uropod 3 with plumose setae; urosomite 3 dorsally elevated; outer margin of telson lobes with spines and setae; accessory flagellum with 5 segments; inner surface of gnathopods 1 and 2 with groups of straight and curled setae
	Echinogammarusfoxi (Schellenberg, 1928)	Basis of pereopods 5–7 with some setal groups on inner surface; antenna 2 with weak setation, short setae; flagellum of antenna 1 with 25 segments
	Echinogammarusischnus Stebbing, 1899	Antenna 1, antenna 2, pereopod 3, gnathopods with densely curled setose; telson very short, with 2 lateral spines and 3 dorsal posterior spines; setation absent or very sparse on peraeopods 5–7.
	Chaetogammarustrichiatus (Echinogammarustrichiatus) Martynov, 1932	Antenna 2, uropod 3 and gnathopods with dense, curled setae
	Echinogammarusstocki G. Karaman, 1970	Antenna 1 with relatively long setae; telson lobes longer than wide; exopod of uropod 3 have dense, long, simple setae
	Echinogammarusveneris (Heller, 1865)	Antenna 2, exopod of uropod 3 and pereopod 3 have dense, simple setae; basis of pereopod 5–7 have some seta groups on inner surface; urosome segments slightly elevated