Matralona Van Damme & Dumont, 2009

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 : 478

Matralona Van Damme & Dumont, 2009

Parthenogenetic female short description. Body oval, of moderate height ( Fig. 13 H); head and valves without keel. Sculpture of valves as weakly developed longitudinal lines. Posteroventral angle of valves without denticles. Rostrum short. Two main head pores with a narrow connection between them; lateral head pores minute. Labral keel wide ( Fig. 13 I), with rounded apex, with cluster of very long setulae on posterior margin.

Postabdomen short and wide ( Fig. 13 J), with convex postanal margin and broadly rounded distal angle; length about 2–2.2 height in Asian species. Preanal angle well defined, postanal angle not defined. Postanal denticles short, in clusters. Postanal lateral groups of setulae with very long and thick distalmost seta; in distalmost groups length of setulae exceed two widths of base of postabdominal claw. Postabdominal claw short, curved, with short basal spine.

Antennule without lateral aesthetascs, all terminal aesthetascs of similar length. Antennal seta without basal peg. Antenna with thin seta on basal segment of endopodite. Spine on basal segment of exopodite longer than middle segment. Spines on apical segments longer than apical segments. IDL of limb I with two setae ( Fig. 13 K); seta 1 absent, setae 2–3 thin, armed with thin setulae.

Single species, Mathralona freyi (Idris & Fernando, 1981) ( Fig. 13 H–K). Length up to 0.36 mm. Rare endemic of South-East Asia, known from Penninsular Malaysia only. For description, see Sinev & Kotov (2012).

Figures

FIGURE 13. A – B, Leydigiopsis pulchra Van Damme & Sinev, 2013. A, lateral view. B, postabdomen. C – G. Magnaspina siamensis (Sinev & Sanoamuang, 2007). C, lateral view. D, posteroventral corner of valves. E, head pores. F, postabdomen. G, IDL and ODL of limb I. H – K, Matralona freyi (Idris & Fernando, 1981). H, lateral view. I, labrum. J, postabdomen. K, IDL and ODL of limb I. (A – B—from Van Damme & Sinev (2013); C – G, from Sinev & Sanoamuang (2007), H – K, from Sinev & Kotov (2012 )).