taxonID	type	description	language	source
03F087B6A355FFD6FCF9FECEFA9561C4.taxon	description	Fig. 3 a – g. PARTHENOGENETIC FEMALE. Length of examined individual 0.84 mm, height 0.47 mm. Body (Fig. 3 a) ovoid, moderately compressed laterally, maximum height approximately at middle. Dorsal and posterior margin of valves convex, ventral margin weakly convex. Anteroventral, Postero-dorsal and postero-ventral angles broadly rounded. Postero-dorsal angle with two denticles (Fig. 3 c – d), ventral margin with row of setae. Head relatively small, with ocellus and eye, rostrum pointed down, relatively narrow. Head shield with two connected major head pores and two lateral head pores (Fig. 3 b). Postabdomen (Fig. 3 e) large, subrectangular, moderately high. Ventral margin straight, distal margin almost straight, distal angle rounded. Dorsal margin slightly convex, straight in postanal portion and weakly concave in anal portion. Postanal angle not defined, preanal angle well exspresed. Postanall margin with 13 well-developed deticles, lateral portion with 14 clusters of setulles. Postabominal claw moderately long, basal spine long and slender. Limb I with IDL with three seta, seta 1 large and broad, claw-like, seta 2 and 3 with thin setulae in distal part, ODL with one long setulaeted setae (Fig. 3 f – g).	en	Garibian, P. G., Chertoprud, E. S. (2022): First records of Cladocera and Copepoda from Chukchagir Lake and its basin (Khabarovsk Territory, Far East of Russia). Arthropoda Selecta 31 (1): 10-18, DOI: 10.15298/arthsel.31.1.02, URL: http://dx.doi.org/10.5281/zenodo.7576486
03F087B6A355FFD6FCF9FECEFA9561C4.taxon	discussion	COMMENTS. B. sibirica is wide distributed in NorthEast Palearctic. Previously this specie regarded as form of Biapertura affinis (Leydig, 1860), but a detailed recent revision confirmed its species status [Sinev et al., 2020] within the genus Biapertura Smirnov, 1971 [Sinev, 2020].	en	Garibian, P. G., Chertoprud, E. S. (2022): First records of Cladocera and Copepoda from Chukchagir Lake and its basin (Khabarovsk Territory, Far East of Russia). Arthropoda Selecta 31 (1): 10-18, DOI: 10.15298/arthsel.31.1.02, URL: http://dx.doi.org/10.5281/zenodo.7576486
03F087B6A355FFD6FEBAFDFEFE4B606C.taxon	description	Fig. 2 a – h. PARTHENOGENETIC FEMALE. Length of examined individual 0.77 mm, height 0.45 mm. Body (Fig. 2 a) ovoid, elongated in lateral view, strongly compressed laterally. Head and carapace with a well-expressed dorsal keel. Dorsal margin convex, postero-dorsal and postero-ventral angles rounded. Ventral margin slightly convex with a row of setae. Labrum with a sub-triangular keel, its posterior margin with two rows of short setules (Fig. 2 b). Postero-vetral angle of valves with 2 – 3 pointed denticles (Fig. 2 c – d). Postabdomen very long, without defined distal margin, its length about 6 heights. Dorsal margin almost straight, preanal margin concave. Postanal margin straight with 17 subrectangular saw toothed denticles. Postanal portion with 13 lateral fascicles (Fig. 2 e). Postabdominal claw slightly curved very long. Basal spine broad with lancet-like shape (Fig. 2 e – f). Limb I with ODL bearing long seta, armed with long setules. IDL with three seta, seta 1 moderate size 1 / 3 length of ODL seta. Seta 2 and 3 hook-like with setulated distal portion (Fig. 2 g – h).	en	Garibian, P. G., Chertoprud, E. S. (2022): First records of Cladocera and Copepoda from Chukchagir Lake and its basin (Khabarovsk Territory, Far East of Russia). Arthropoda Selecta 31 (1): 10-18, DOI: 10.15298/arthsel.31.1.02, URL: http://dx.doi.org/10.5281/zenodo.7576486
03F087B6A355FFD6FEBAFDFEFE4B606C.taxon	discussion	COMMENTS. C. fennicus is regarded as a rare species, it is distributed in Germany, Poland, Scandinavia, North Europian part of Russia and Yakutia [Sinev, 2014]. Previously it was recorded in the Zeya River basin [Kotov et al., 2011 a] and the Kolyma River [Smirnov, 1971]. This is a rare species in the Far East also.	en	Garibian, P. G., Chertoprud, E. S. (2022): First records of Cladocera and Copepoda from Chukchagir Lake and its basin (Khabarovsk Territory, Far East of Russia). Arthropoda Selecta 31 (1): 10-18, DOI: 10.15298/arthsel.31.1.02, URL: http://dx.doi.org/10.5281/zenodo.7576486
03F087B6A355FFD6FF41FAEEFB49640C.taxon	description	Fig. 2 i – n. PARTHENOGENETIC FEMALE. Length of examined individual 0.62 mm, height 0.29 mm. Body (Fig. 2 i) ovoid, elongated in lateral view, strongly compressed laterally and having a dorsal keel. Head rostrum pointed down, its tip broadly rounded (Fig. 2 j). Dorsal margin convex, ventral margin slightly concave. Postero-dorsal and postero-ventral angles rounded. Ventral part of valves bearing setae, which covered more than half of margin. Postero-ventral angles of valves with dentical (Fig. 2 k). Postabdomen very long, narrowing distally, its length about five heights. Anal margin almost straight, preanal portion slightly concave, postanal margin slightly concave to straight with 14 - clustered postanal denticles with fused bases. Preanal angle well-developed, a postanal angle not defined (Fig. 2 l). Postabdominal claw long with curved tip. Basal spine slightly bent, shorter than claw about 4,2 X (Fig. 2 m). Limb I with ODL bearing long seta, armed with long setules. IDL with three seta, seta 1 large, seta 2 and 3 thick, curved with setulated distal portion (Fig. 2 n).	en	Garibian, P. G., Chertoprud, E. S. (2022): First records of Cladocera and Copepoda from Chukchagir Lake and its basin (Khabarovsk Territory, Far East of Russia). Arthropoda Selecta 31 (1): 10-18, DOI: 10.15298/arthsel.31.1.02, URL: http://dx.doi.org/10.5281/zenodo.7576486
03F087B6A355FFD6FF41FAEEFB49640C.taxon	discussion	COMMENTS. It is the second record of C. lilljeborgi from the Amur River basin. This population is located more northwest as compared to previous record from Bolon Lake basin. C. lilljeborgi is, probably, widely distributed in Northern Eurasia, but this is a relatively rare species.	en	Garibian, P. G., Chertoprud, E. S. (2022): First records of Cladocera and Copepoda from Chukchagir Lake and its basin (Khabarovsk Territory, Far East of Russia). Arthropoda Selecta 31 (1): 10-18, DOI: 10.15298/arthsel.31.1.02, URL: http://dx.doi.org/10.5281/zenodo.7576486
03F087B6A355FFD5FC8AFB01FCB6623D.taxon	description	Fig. 2 h – l. PARTHENOGENETIC FEMALE. Length of examined individual 0.32 mm, height 0.21 mm. Body (Fig. 3 h) ovoid, short. Maximum height at the middle. Dorsal and posterior margin of valves convex, ventral margin slightly convex. Posterior margin rounded, anterior margin weakly straight. Head with a short rostrum, without a dorsal keel. Valves with weakly developed longitudinal lines in postero-ventral and postero-dorsal portion (Fig. 3 h – i). Postero-ventral angle without denticles (Fig. 3 i). Postabdomen (Fig. 3 j) short, dorsal margin convex, ventral margin slightly straight. Lateral portion with rows of clustered setae. Postanal margin with with well-developed marginal denticles, anal margin weakly convex, preanal margin slightly straight. Postabdomenal claw long with long basal spine. Limb I with IDL bearing two setae, armed with long slender spines, ODL with one long seta (Fig. 3 k – l).	en	Garibian, P. G., Chertoprud, E. S. (2022): First records of Cladocera and Copepoda from Chukchagir Lake and its basin (Khabarovsk Territory, Far East of Russia). Arthropoda Selecta 31 (1): 10-18, DOI: 10.15298/arthsel.31.1.02, URL: http://dx.doi.org/10.5281/zenodo.7576486
03F087B6A355FFD5FC8AFB01FCB6623D.taxon	discussion	COMMENTS. Common species in South-East Asia [Sinev, 2016] and Russian Far East. We supposed to found Coronatella trachystriata (Chen, Zhang et Liu, 1994) in Chukchgir Lake basin, but it was not found. The Bolon Lake basin seems to be the northeast location for this species. C. BIODIVERSITY ANALYSIS Our analysis revealed that the copepods are wellstudied taxonomically — both sample-based rarefaction curves and the best species richness estimator reached the same plateau at 14 taxa (Fig. 4 b). In contrast, neither the sample-based rarefaction curves nor the best species richness estimator reached a plateau for the Cladocera (Fig. 4 a). Therefore, the cladoceran biodiversity is still inadequately studied in this region.	en	Garibian, P. G., Chertoprud, E. S. (2022): First records of Cladocera and Copepoda from Chukchagir Lake and its basin (Khabarovsk Territory, Far East of Russia). Arthropoda Selecta 31 (1): 10-18, DOI: 10.15298/arthsel.31.1.02, URL: http://dx.doi.org/10.5281/zenodo.7576486
