taxonID	type	description	language	source
6512879BFFDE0827988F825EFE6947E0.taxon	description	Female. Morphology of studied populations agrees well with that from initial description of the species. Chinese populations have a rather low body (Fig. 2 D), antenna with extremely long spines (Fig. 2 F), setae of inner distal lobe of thoracic limb I of a characteristic morphology (Fig. 2 G) and postabdomen of a characteristic shape (Fig. 2 H) armed with groups of short elementary denticles, The only difference between Jeju and Chinese populations concerns the morphology of setulae on the postero-ventral angle of valves, in Chinese populations they are differentiated, forming several groups (Fig. 2 E), while in populations from Jeju they are completely uniform (Sinev et al. 2022). Male. The length of a single studied specimen was 0.31 mm, height was 0.17 mm. Body (Fig. 2 I) low oval, with maximum height before midline, lower than in female, height / length ratio about 0.54. Ocellus and eye larger than in female. Postabdomen (Fig. 2 J) short, with almost parallel margins in anal portion, narrowing distally in postanal portion, dorso-distal angle not defined. Ventro-distal angle well-defined, obtuse. Sperm duct openings located ventrally almost at the end of postabdomen. Preanal angle is well-defined, postanal angle is not defined. Distal part of postabdomen 1.5 times longer than proximal part. The preanal, anal portion is 1.5 times longer than the postanal one. Clusters of short setulae in place of marginal denticles, lateral fascicles of setulae wider and located more close to each other than in female. Postabdominal claw shorter than that of females, with four-five strong spines on the inner side. Basal spine long and thin, about 0.3 – 0.4 length of claw. Antennule (Fig. 2 K) thicker than in female, with 10 terminal and 2 lateral aesthetascs. Lateral aestetascs of unequal length, about 2 / 3 and 1 / 2 length of the antennule. Male seta arising at 2 / 3 length from tip, about 1 / 3 of antennule length. A single cluster of long setulae is located on the anterior face of the antenna. Thoracic limb I (Fig. 2 L – N) with a short U-shaped copulatory hook 25 times shorter than limb itself. Copulatory brush present, copulatory brush seta short. Ventral face of limb below them with double row of numerous short thick setulae. Inner distal lobe without seta 1; setae 2 and 3 much shorter and thinner than in female, armed with moderately thick setulae; male seta curved, a little longer or as long as seta 2. Males of C. (C.) jejuana differ from males of C. (C.) rectangula (see descriptions in Sinev 2020, Sinev et al. 2020) in shape of postabdomen, in unequal in length lateral aestetascs of antenna, and in IDL seta 3 without strong spine. C. (C.) jejuana can be easily confused with C. (C.) rectangula, so it is possible that this species is widely distributed in Central and North China. Coronatella rectangula (Sars, 1862). Common littoral phytophilous species, abundant in all seasons. Few males and ephippial females were present in November only. Predominantly Palearctic species, distributed from Spain to Far East of Russia, common in China. In East Asia, the species penetrates south up to Peninsular Malaysia and Borneo, but the Southeast Asian populations differ slightly from those of the Palearctic in that they have narrower postabdomen, probably presenting species-complex (Sinev et al. 2015). Common in China (Ji et al. 2015).	en	Sinev, Artem Y., Liu, Ping, Gu, Yangliang, Han, Bo-Ping (2025): Autumn, winter and spring fauna of Cladocera in lakes and reservoirs of Jiangsu province, East China. Zootaxa 5722 (2): 229-248, DOI: 10.11646/zootaxa.5722.2.4, URL: https://doi.org/10.11646/zootaxa.5722.2.4
