Hemicypris kibiensis Okubo, 1990

Smith, Robin James & Chang, Cheon Young, 2020, Taxonomic assessments of some Cyprinotinae Bronstein, 1947 species (Crustacea: Ostracoda) from Japanese and Korean rice fields, including (re-) descriptions of six species and a review of the type species of the subfamily, Zootaxa 4795 (1), pp. 1-69 : 23

Hemicypris kibiensis Okubo, 1990

( Figs 4 M–O)

1990 Hemicypris kibiensis sp. nov. —Okubo: 9, figs 3d–f (fide Okubo 2004).

2008 Hemicypris kibiensis Okubo, 1990 —Savatenalinton & Martens: Table 1.

2009 Hemicypris kibiensis Okubo, 1990 —Hayashi et al.: 77.

2004 Hemicypris megalops Sars, 1903 —Okubo: 26, figs 11i–l.

2011 Hemicypris kibiensis Okubo, 1990 —Martens & Savatenalinton: 43 (as syn. of Hemicypris megalops ).

2012 Hemicypris kibiensis Okubo, 1990 —Hayashi et al.: 62.

2013 Hemicypris kibiensis Okubo, 1990 —Martens et al.: No page numbers.

2012 H. kibiensis Okubo 1990 b—Karanovic: 438, 441.

2019 Hemicypris kibiensis Okubo, 1990 —Meisch et al. 64 (as syn. of Hemicypris megalops ).

Material examined. JAPAN • 1♀, “ Hemicypris megalops 010725 ”, valves and appendages mounted on a glass slide in an unknown matrix; [Okayama]; Ichiro Okubo leg.; LBM 1430009515 .

Remarks. The specimen of Hemicypris kibiensis examined was provided by Ichiro Okubo. The slide is labeled as Hemicypris megalops , but because Okubo (2004) considered Hemicypris megalops a senior synonym of Hemicypris kibiensis we assume that this specimen represents Hemicypris kibiensis of Okubo (1990). Overall, in carapace shape and size, this specimen resembles Hemicypris megalops ( Fig. 4C, M & N ). However, the h2 seta on the seventh limb is not reflexed and distally this limb is not compact and rounded. Additionally, in transmitted light microscopy, the valves have a reticulated pattern (ca. 14–25 µm across) overlying a finer, poorly defined granular background ( Fig. 4O ). Such a reticulated pattern has not been recorded for Hemicypris megalops . We therefore can- not confirm the proposed synonymy by Okubo (2004) that Hemicypris kibiensis is a junior synonym of Hemicypris megalops , and refer to this specimen as Hemicypris kibiensis . A lack of specimens hinders further work on this species.

Figures

FIGURE 4. A & B, Cyprinotus cassidula sp. nov. (sample 10; see Table 1).A, left lateral view of whole carapace, female. B, left lateral view of whole carapace, male. C, Hemicypris megalops, whole carapace, right lateral view, female (paralectotype from Sumatra, Indonesia F12292c2, before dissection). D–F, Hemicypris posterotruncata. D & E, left lateral views of whole carapaces, females. F, dorsal view of whole carapace, anterior to left, female. G & H, Hemicypris ovata. G, paralectotype (NHMO F12264c), right view of whole carapace, female (prior to SEM). H, paralectotype (NHMO F12264b), internal view of right valve, female (before dissection). I & J, Hemicypris barbadensis (LBM 1430009514). I, left valve, internal view, female. J, right valve, internal view, female. K & L, Heterocypris savatenalintonae sp. nov. K, left lateral view of whole carapace, female. L, left lateral view of whole carapace, male. M–O, Hemicypris kibiensis (LBM 1430009515). M, left valve, internal view, female. N, right valve, internal view, female. O, high magnification transmitted light microscopy of valves. A–H, K & L, photographed while specimens submerged in water. I, J, M–O, mounted in unknown medium on glass slide.All photographs focussed stacked. Scale bar = 1506 µm for A & B, 1000 µm for C to N, 238 µm for O.