Candona brehmi, Smith, Robin J., 2011

Smith, Robin J., 2011, Groundwater, spring and interstitial Ostracoda (Crustacea) from Shiga Prefecture, Japan, including descriptions of three new species and one new genus, Zootaxa 3140, pp. 15-37 : 22-23

Cryptocandona brehmi ( Klie, 1934)

( Figs 5A–D , 6 ).

1934 Candona brehmi n. sp. —Klie: 197, figs 11–14.

nov. comb. 1947 Cryptocandona brehmi ( Klie, 1934) —Bronshtein: 263.

Material examined. Eighteen females from a large pond fed by a spring approximately 325 meters upstream, at the foot of Mount Ibuki, Ueno, Maibara, Shiga Prefecture N35º 23’ 31.0”, E136º 23’ 33.7”, altitude 346 m, 2 August 2010. Material collected by the author.

Size: length 831–892 µm, height 379–419 µm.

Remarks. Previously this species has been recorded only once, from a cave in Nagano Prefecture ( Klie 1934; Namiotko and Danielopol 2002). This species is very similar to Cryptocandona reducta ( Alm, 1914) , and is distinguished from it mainly by shorter lengths of the G3 and GM claws of the antennae, a relatively short Sp seta on the caudal ramus, only very weakly protruding genital lobe and smaller size of the carapace. (For more details see Namiotko and Danielopol 2002). In their redescription of the only known syntype, Namiotko and Danielopol (2002) noted that the antennules are asymmetrical. However, the antennules of specimens collected in Shiga Prefecture are symmetrical, suggesting that the asymmetrical antennules of the syntype are an anomaly. The antennules of the Shiga specimens are most similar to the left one of the syntype, ( Fig. 6 B) suggesting that the right antennule of the syntype is the anomalous one.

This species was found in a pond in a wooded area, on a substrate of fallen leaves on sand. The pond is fed by a large, fast flowing spring about 325 meters upstream of a steep, wooded valley. The spring extrudes from a boundary of limestone above a clay layer.

Figures

FIGURE 6. Cryptocandona brehmi. A. internal view of left valve (LBM 1430005078). B. antennule (LBM 1430005079).

FIGURE 5. A – D, Cryptocandona brehmi. A. internal view of right valve (LBM 1430005078). B. internal view of left valve (LBM 1430005078). C. dorsal view of whole carapace, anterior to left (LBM 1430005080). D. right lateral view of whole carapace (LBM 1430005080). E – H, Cryptocandona tsukagoshii n. sp. E – internal view of right valve (LBM 1430005084). F. internal view of left valve (LBM 1430005084). G. dorsal view of whole carapace, anterior to left (LBM 1430005083). H. right lateral view of whole carapace (LBM 1430005083).