Graptoleberis Sars, 1862

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 : 471

Graptoleberis Sars, 1862

Parthenogenetic female short description. Body low, with straight ventral margin and convex anterior margin; valves with weakly-developed keel ( Fig. 10 J). Sculpture of valves as well-defined polygons. Posteroventral angle of valves with 1–3 large, closely spaced denticles ( Fig. 10 K). Anterior portion of head shield broadly rounded; rostrum triangular in lateral view. Three main head pores with narrow connection between them; lateral head pores minute. Labral keel of moderate width, with rounded apex, with clusters of setulae on apex and posterior margin.

Postabdomen short, narrowing distally, without distal margin and distal angle; length about 3 heights ( Fig. 10 L). Preanal angle weakly defined, postanal angle not defined. Postanal denticles short, thin, in clusters, not exceeding the width of postabdominal claw base. Postanal lateral groups of moderately long, thin setulae. Postabdominal claw short, curved, with short basal spine and transverse rows of spinulae in distal portion.

Antennule without lateral aesthetascs, all terminal aesthetascs of similar length. Antennal seta without a basal peg. Antenna with thin seta on basal segment of endopodite. Spine on basal segment of exopodite of about 1/4 length of middle segment. Spines on apical segments somewhat shorter than apical segments. IDL of limb I with three setae; seta 1 short; setae 2–3 thin, armed with thin setulae.

Single species, Graptoleberis cf. testudinaria (Fisher, 1848) ( Fig. 10 J–K). Length up to 0.5 mm. Rare, but recorded from all parts of the region (see Korovchinsky, 2013), found in lakes and ponds. Littoral species, associated with vegetation. The species was described from Europe, and is recorded worldwide, probably a species-complex. For description, see Alonso (1996).

Figures

FIGURE 10. A – E. Euryalona orientalis (Daday, 1898). A, lateral view. B, head pores. C, postabdomen. D, postanal margin of postabdomen. E, antenna. F, IDL of limb I. F – H, Flavalona costata (Sars, 1862). F, lateral view. G, head pores. H, postabdomen. I, Flavalona cheni (Sinev, 1999), head pores. J – L. Graptoleberis testudinaria (Fischer, 1851), J, lateral view. K, posteroventral corner of valves. L, postabdomen. (A – E, J – L, orig.; F – H, from Sinev et al., 2015; I, from Sinev (1999 )).