Camptocercus cf. lilljeborgi Schödler, 1862

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), pp. 10-18 : 15

Camptocercus cf. lilljeborgi Schödler, 1862

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 4,2X ( 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 ).

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.

Figures

Fig. 2. Parthenogenetic females of Camptocercus fennicus (a–h) from Chukchagir Lake, 300 m from mouth of the Bikkitckan River: a — lateral view; b — labrum; c–d — postero-ventral margin of valves; e–f — postabdomen and postabdominal claw; g–h — IDL of limb I and limb I; C. lilljeborgi (i–n) from Chukchagir Lake, Tavckit Bay apex part: i — lateral view; j — head; k — postero-ventral margin of valves; l, m — postabdomen and postabdominal claw; n — limb I. Scale bars: 0.1 mm. Рис. 2. Партеногенетические самки Camptocercus fennicus (a–h) иЗ оЗера Чукчагирское, 300 м от устьЯ реки Биккиткан: a — вид сбоку; b – лЯбрум; c–d — Задне-нижний край створки. e–f — постабдомен и постабдоминальный коготь; g–h — внеШнЯЯ дистальнаЯ долЯ торакопода I и торакопод I; C. lilljeborgi (i–n) иЗ оЗера Чукчагирское, Залив Тавкит кутоваЯ часть: I — вид сбоку; b — голова; k — Задне-нижний край створки; l, m — постабдомен и постабдоминальный коготь; n — торакопод I. МасШтабнаЯ линейка: 0,1 мм.