Microdarwinula zimmeri ( Menzel, 1916 ), 2005

Ma, Shunxin & Yu, Na, 2020, Freshwater ostracods (Crustacea) from Hainan Island, southern China, with description of a new species, Zootaxa 4767 (2), pp. 201-243 : 234

Microdarwinula zimmeri ( Menzel, 1916)

Figures 30D and 31A .

1916 Darwinula zimmeri n. sp. — Menzel: 487 –489, figs. 16–17.

1952 Darwinula brevis n. sp. — Straub: 498, figs. 21–22.

1968 Microdarwinula zimmeri (Menz) — Danielopol: 154 –163, figs. 1–28.

Material examined: Eighteen females from HK 3, one female ( ECNU 20170411/HN40) dissected.

Dimensions: Female. RV, n = 1, length 0.324 mm; LV, n = 1, length 0.344 mm; height 0.194 mm.

Description: Carapace white. LV overlapping RV. Greatest height approximately at mid-length. Dorsal margin arched ( Fig. 30D ). Aesthetasc y1 present on penultimate segment of A2 ( Fig. 31A ).

Distribution: This species has been found in Europe, Western Africa, North America, the Caribbean, Madagascar, the Middle East and Indonesia ( Rossetti & Martens 1998). This species was found in Haikou on Hainan Island.

Remarks: There are only two species in this genus: M. inexpectata Pinto et al., 2005 and M. zimmeri ( Menzel, 1916) ( Pinto et al. 2005) . M. zimmeri can be easily distinguished by the presence of aesthetasc y1 on A2 (absent in M. inexpectata ). M. zimmeri has been reported to be widely distributed, while M. inexpectata has only been reported from South America ( Pinto et al. 2005).

Figures

FIGURE 30. A–C, Cypridoidea gen. et sp. indet. 2. A, ECNU20170418/HN3-34, dorsal view anterior to the right; B, ECNU20170418/HN3-35 internal view of RV; C, ECNU20170418/HN3-35, external view of LV; D, Microdarwinula zimmeri (Menzel, 1916). Female. ECNU20170411/HN40, internal view of RV. Scale bars: 100 μm.

FIGURE 31. A, Microdarwinula zimmeri (Menzel, 1916). Female. ECNU20170411/HN40. A, A2. B–C, Vestalenula cornelia Smith et al., 2006. Female. ECNU20170417/HN41. B, adductor muscle scars; C, UR and P-abd. Scale bars: 100 μm.