Character;"Character states";dershavini-gr.;ambulans-gr.;wachuschtii-gr. 1Eyes;"ommatidia reduced";"well developed";"entirely lost" "Antenna 1 / Body length ratio (males)";0.60–0.90;0.45–0.60;"up to 0.30" "Antenna 1 / Antenna 2 length ratio (males)";>2.0;>1.33;<=2.0 Calceoli;absent;present;? "Inferior antennal sinus";distinct;indistinct;indistinct "Lower lip, inner lobes";broad;vestigial;vestigial "Gnathopod 2 type, (palmar margin)";"crangonyctid type (bevelled)";"synurellid type (sub-transverse)";"synurellid type (sub-transverse)" "Gnathopod 2, carpal lobe";narrow;broad;broad "Number of pleopod retinacula";4–6;2;2 "Coxal plates 1-4";"shallow or deep";deep;deep "Sexual dimorphism";"Males larger than females";"Females larger than males";? "Body length, mm";"up to 13";"up to 10";"up to 6" Species;"S. dershavini, S. donensis, S. osellai, S. odessana, sp. nov.";"S. ambulans, S. behningi, S. lepida, S. philareti";"S. wachuschtii, Synurella sp. (Sidorov et al. in prep.)" Ecology;"hypogean or spring inhabitants of karstic regions (preadapted stygobionts)";"epigean inhabitants of coastal lowlands, stygophiles (crenobionts)";"minute inhabitants of interstitial waters (stygobionts)"