Camptocercus Baird, 1843

Sinev, Artem Y., 2016, Key for identification of Cladocera of the subfamily Aloninae (Anomopoda: Chydoridae) from South-East Asia, Zootaxa 4200 (4), pp. 451-486 : 464

Camptocercus Baird, 1843

Parthenogenetic female short description. Body low to moderately high, oval; head and valves with a welldefined keel in all Old World species ( Fig. 7 D). Sculpture of valves as longitudinal lines. Posteroventral angle of valves with or without denticles. Rostrum triangular in lateral view, with a pointed or blunt apex. Three main head pores with narrow connection between them, located at widened part of head keel. Lateral head pores minute. Labral keel of moderate width, with rounded or blunt apex, with clusters of setulae on posterior margin.

Postabdomen very long and narrow, with narrowing distally in postanal part; length about 5–6 heights ( Fig. 7 E, G). Preanal angle weakly defined, postanal angle not defined. Postanal denticles of variable shape. Postanal lateral groups of short setulae; in distalmost groups, length of setulae less than the width of base of postabdominal claw. Postabdominal claw long, almost straight, with short basal spine. A prominent spine or pecten of spines located at the middle of the claw.

Antennule without lateral aesthetascs; two of terminal aesthetascs much longer than others. Antennal seta without basal peg. Antenna without a seta on basal segment of endopod. Spine on basal segment of exopodite less than 1/4 length of middle segment. Spines on apical segments less than about 1/3 length of apical segments. IDL of limb I with three setae of variable morphology.

Taxonomic notes: two species recorded in the region, C. vietnamensis and C. uncinatus , are very close to each other in external morphology and morphology of appendages. The species can be recognized only by careful examination of postabdomen armament, they also differ in size. Many earlier records of Camptocercus from South- East Asia, including one of Idris (1983) were attributed to Camptocercus australis Sars, 1896 but this species is not present in the region.

Figures

FIGURE 7. A – C, Anthalona milleri (Kiser, 1948). A, head pores. B, postabdomen. C, IDL setae of limb I. D – H. Antalona sanoamuangae Sinev & Kotov, 2012. D, lateral view. E, head pores. F, labrum. G, postabdomen. H, IDL and ODL of limb I. I – M. Anthalona spinifera Tiang-nga, Sinev & Sanoamuang, 2016. I, lateral view. J, head pores. K, labrum. L, postabdomen. M, IDL and ODL of limb I. (A – C, after Van Damme (2016); D – H, from Sinev & Kotov (2012); I – M, from Tiang-nga et al. (2016 )).