Pseudochydorus globosus ( Baird, 1843 )

Sinev, Artem Y., Garibian, Petr G. & Gu, Yangliang, 2016, A new species of Pseudochydorus Fryer, 1968 (Cladocera: Anomopoda: Chydoridae) from South-East Asia, Zootaxa 4079 (1), pp. 129-139 : 137

Pseudochydorus globosus ( Baird, 1843)

( Figs. 5–6 )

Material examined. 5 parthenogenetic females from Glubokoe lake, Ruza district, Moscow Area, Russia, 0 6.2014, coll. P.G. Garibyan; 12 parthenogenetic females from Sterlyazhiy pond at Zvenigorod Biological Station of M.V. Lomonosov Moscow State University, Odintsovo district, Moscow Area, Russia 0 7.2014, coll. A. Y. Sinev; 23 parthenogenetic females from Sadki pond, Tekstilschiki district of Moscow, Russia. 0 9.2014, coll A. Y. Sinev.

Comments. Specimens from European Russia agree well with previous descriptions (see Van Damme & Dumont 2007, Hudec 2010) and are similar to P. bopingi sp. nov., but differ in the following characters: Body ( Fig. 5 A–C, 6A–G) similar to the previous species, but of greater size (maximum length of female in studied material 0.73 mm, according to literature, maximum length is 0.8 mm). Valves with narrow flattened flange along posterior margin only. In studied material, sculpture of valves as weakly defined polygons with small cavities at outer side of polygon ( Fig 6 H). Head with long evenly curved rostrum, pointing down, tip of rostrum same as in the previous species ( Fig. 6 I). Length of rostrum (measured from rostrum tip to the level of mandibular articulation point) is about 0.43–0.46 height of the body. Diameter of ocellus 2 times smaller than diameter of eye. Distance between ocellus and tip of the rostrum about two distances between ocellus and the center of the eye. Antenna ( Fig. 5 D) with seta arising from basal segment as reaching to the end of endopodite. Limb II ( Fig. 5 E) with spines 5 and 8 armed with short triangular spines.

Figures

FIGURE 5. Pseudochydorus globosus (Baird, 1843) from Sterlyazhiy pond at Zvenigorod Biological Station of M. V. Lomonosov Moscow State University, Odintsovo district, Moscow Area, Russia, parthenogenetic females. A – C, lateral view. D, antenna. E, thoracic limb II.

FIGURE 6. Pseudochydorus globosus (Baird, 1843) from Sterlyazhiy pond at Zvenigorod Biological Station of M. V. Lomonosov Moscow State University, Odintsovo district, Moscow Area, Russia, parthenogenetic females. A – G, specimens in different views (end and start of valve flange are shown by arrows). H, valve. I, rostrum. Scale bars denote 0.2 mm for A – G, 0.08 mm for H, 0.02 mm for I.