Pseudocandona sarsi (Hartwig, 1899)

Smith, Robin J. & Janz, Horst, 2008, Recent species of the Family Candonidae (Ostracoda, Crustacea) from the ancient Lake Biwa, Central Japan, Journal of Natural History 42 (45 - 46), pp. 2865-2922 : 2909

Pseudocandona sarsi (Hartwig, 1899)

( Figures 17K,L and 25 )

Candona sarsi Hartwig, 1899 .

Candona dentata G.W. Müller, 1900

Candona pubescens G.O. Sars, 1890 : Kaufmann, 1900

Remarks

A small number of female specimens were recovered from the Karasuma Peninsula (locality 81 in Figure 1 ). With three setae in the setal group of the second segment of the mandibular palp, this species belongs to the rostrata group of Pseudocandona . Without males, the identification of this species remains tentative because several species in this group have similar female carapace shapes [e.g. Pseudocandona marchica (Hartwig, 1899) , Pseudocandona rostrata (Brady and Norman, 1889) and Pseudocandona hartwigi (G. W. Müller, 1900) ]. However, the size and shape of the carapace, the proportions of the caudal ramus and the relatively long length of the antennal G2 claw (over twice the length of the final segment) very closely match those reported for P. sarsi in the literature (e.g. Meisch 2000). The h1 seta on the L7 is slightly longer than that reported for European specimens and the Japanese specimens are missing the tiny denticles on the penultimate segment of this limb. This is the first record of this species from Japan. Previously known from Europe (see review in Meisch 2000). It was found amongst the root mats below willow trees. Locality 81 in Figure 1 .

Figures

Figure 1. Location of Lake Biwa and sampling localities.

Figure 17. (A–D) Fabaeformiscandona pedana sp. nov. (A) Male, right valve, external view (LBM 1430003316); (B) female, right valve, external view (LBM 1430003317); (C) dorsal view of female left valve (LBM 1430003317); (D) dorsal view of female right valve (LBM 1430003317). (E–G) Fabaeformiscandona nishinoae sp. nov. (E) Male, whole carapace, right lateral view (LBM 1430003318); (F) female, whole carapace, right lateral view (LBM 1430003319); (G) dorsal view of female, anterior to right (LBM 1430003320). (H–J) Fabaeformiscandona akaina sp. nov. (H) Male, whole carapace, right lateral view (LBM 1430003324); (I) female, whole carapace, right lateral view (LBM 1430003325); (J) dorsal view of female, anterior to right (LBM 1430003325). (K,L) Pseudocandona sarsi. (K) Female, whole carapace, right lateral view (LBM 1430003328); (L) female, whole carapace, dorsal view, anterior to right (LBM 1430003328). Scale bar below L represents 515 Mm for A–D, 618Mm for E–G, 761Mm for H–J, 510Mm for K and L.

Figure 25. (A–D) Pseudocandona sarsi. (A) Female left valve, internal view (LBM 1430003329); (B) distal section of female An2 (LBM 1430003330); (C) L7 (LBM 1430003330); (D) UR (LBM 1430003330).