Camptocercus fennicus Stenroos, 1898

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 fennicus Stenroos, 1898

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 ).

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., 2011a] and the Kolyma River [ Smirnov, 1971]. This is a rare species in the Far East also.

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.