A New Finding Of The Non-Native Copepod Sinodiaptomus Sarsi (Copepoda, Calanoida, Diaptomidae) In Ukraine Author Svetlichny, L. Schmalhausen Institute of Zoology NAS of Ukraine, vul. B. Khmelnytskogo, 15, Kyiv, 01030 Ukraine Author Samchyshyna, L. Institute of Fisheries, National Academy of Agrarian Sciences, vul. Obukhivska, 135, Kyiv, 03164 Ukraine & Institute of Fisheries and Marine Ecology, Konsulska st., 8, Berdiansk, 71118 Ukraine text Zoodiversity 2021 2021-01-05 55 1 1 8 http://dx.doi.org/10.15407/zoo2021.01.001 journal article 54094 10.15407/zoo2021.01.001 7372567d-3a99-4e51-b68c-d6791cee87cf 2707-7268 6377802 Sinodiaptomus sarsi ( Rylov, 1923 ) R e d e s c r i p t i o n. Female ( FIg. 1 , A ). Body length (excluding furcal setae) 2.05–2.49 mm (2.24 ± 0.13 mm , n = 15), prosome length 1.45–1.75 mm (1.58 ± 0.09 mm ), prosome width 0.51 – 0.65 mm (0.58 ± 0.04 mm ). The dorsal surface of last prosomal somite with a chitinous, triangular projection ( FIg. 1 , A ), which is a diagnostic character of the genus Sinodiaptomus ( Kiefer, 1932 ) . This somite with moderately developed wings. Left wing twolobed with inner one round. Right wing relatively pointed. Both lobes with strong hyaline spine ( FIg. 2 ). Urosome with three somites, genital somite slightly asymmetrical, with a moderately long hyaline spine on each side, the intermediate somite short. Antennules extending beyond the caudal setae ( FIg. 1 , A ). Сoxopodite of leg 5 with long, strong, distolateral projection ( FIg. 3 , arrow). Male ( FIg. 1 , B). Body length 1.9–1.95 mm (1.91 ± 0.02 mm , n = 20), prosome length 1.20–1.32 mm (1.25 ± 0.04 mm ), prosome width 0.45–0.48 mm (0.46 ± 0.02 mm ). Urosome has a lateral bend to the right. Antennules reach the end of caudal rami. Right antennule geniculated between segments 18 and 19; segment 15 ( FIg. 4 ) with longer projection than that of segment 14; antepenultimate segment of right male antennule with a comb-like process ( FIg. 4 ). Basipodite of right leg 5 with a wide round process reaching almost the distal end of the exopodite I and with a hyaline lamella on its distal inner margin ( FIg. 5 ). Exopodite II of left leg 5 ending in a lamellate thumb-like process with short posterodistal basal projection.