CANDONINAE Kaufmann, 1900

Ma, Shunxin & Yu, Na, 2018, Freshwater ostracods (Crustacea) from Tiantong National Forest Park and Dongqian Lake, eastern China, with descriptions of two new species, Journal of Natural History 52 (27 - 28), pp. 1825-1868 : 1830-1831

Subfamily CANDONINAE Kaufmann

Genus Candonopsis Vávra

Candonopsis (Candonopsis) transgrediens Brehm, 1923

( Figures 2 , 3 )

Candonopsis transgrediens sp. nov. Brehm, 1923: 340–342; figs. 3, 10–14.

Material examined

Two females, one dissected (ECNU20150419/TT44) and one for SEM (ECNU20150419/TT4401).

Dimensions

(Female, n = 2) Length, 0.87–0.92 mm; height, 0.43–0.46 mm.

Brief description

Female, in lateral view, dorsal margin of the carapace arched. Posterior end wider than the anterior ( Figure 2 ). Maximum height behind the middle. Two setae present on end of first endopodal segment of A2, one long, reaching to middle of terminal claws, one short, not easily visible ( Figure 3 ). Terminal segment of Md palp with length equalling six times width, apical claw fused with segment. L6 five-segmented. Seta d1 long. Setae e and f short, seta f not reaching to end of next segment. L7 with three d setae. Setae e and f reaching mid-length of the next segments, respectively. Length ratios of three h setae approximately equalling 1: 1.7: 2.4. UR thin and with prominent denticles along posterior margin. Seta Sa slender and Sp absent. Claws Ga and Gp well-developed, with claw Gp equalling three-quarters length of claw Ga. Claw Gp with a distinct spine medially. UR attachment with more than two branches.

Distribution

This species has been reported from China ( Brehm 1923) and Korea ( Karanovic and Lee 2012). In China, this species was only reported from Guangdong ( Brehm 1923).

Remarks

The genus Candonopsis can be distinguished from other genera of the Candoninae by the following characters: the length of terminal segment of the Md palp is more than three times as long as its width, the L7 is five-segmented, with the terminal segment supporting two long and one short setae, seta Sp on the UR is absent. There are two subgenera in the genus Candonopsis . In the subgenus Candonopsis , one d seta is present on the basal segment of the L6, whereas this seta is missing in the subgenus Abcandonopsis ( Karanovic 2004) . Candonopsis (C.) transgrediens can be easily distinguished from other species in subgenus Candonopsis according to carapace and soft-body characters, such as the length of the carapace, the ratio between the length and width of the terminal segment of the Md palp equalling 6 ( Figure 3b ), L7 with completely divided penultimate segment and seta h2 about 1.7 times longer than h1 ( Figure 3c ), UR with prominent denticles along the posterior margin, seta Sa present and claw Gp with a strong spine ( Figure 3d ) ( Karanovic and Lee 2012).

Figures

Figure 2. Candonopsis (Candonopsis) transgrediens Brehm, 1923. Female. (a) ECNU20150419/TT4401, external view of RV; (b) ECNU20150419/TT44, internal view of RV. Scale bars: 100 μm.

Figure 3. Candonopsis (Candonopsis) transgrediens Brehm, 1923. ECNU20150419/TT44. Female. (a) A2; (b) Md; (c) L7; (d) UR; (e) UR attachment. Scale bars: 100 μm.