Lycopterocypris sp.

Wang, Yaqiong, 2025, First report of the non-marine ostracod fauna from the Lower Cretaceous Xiaonangou Formation of the Baishan Basin, NE China, Zootaxa 5660 (4), pp. 560-572 : 566

Lycopterocypris sp.

Figs. 2 , 4G–H .

Material. Three carapaces.

Dimensions. L: 0.65 mm, H: 0.37 mm, W: 0.25 mm.

Description. Small size carapace with round-triangle shape in lateral view. Maximum height at mid-length, maximum length at 2/3 of maximum height, maximum width at mid-length. LV> RV; LV overlapping RV along all margins. Both anterior and posterior margin rounded and infracurvate, and with rounded cardinal angles. Dorsal margin rounded arch, sloping towards both anterior and posterior margins. Ventral margin nearly straight or slightly convex. Surface smooth.

Remarks. The studied specimens closely resemble some Lycopterocypris species described by Ye et al. (2002), such as L. triangularis Ye (in DOFEAD 1976), L. grandis Ye (in DOFEAD 1976), and L. pyriformis Ye (in DOFEAD 1976). However, Lycopterocypris sp. is shorter and has a more rounded dorsal margin. These differences might indicate intraspecific variation, and additional material is needed to clarify this.

Figures

FIGURE 2. Stratigraphic column for the ostracod-bearing sequence in the Guanghuanjie-Yumuqiaozi section (41°56'34.4"N, 126°34'18.6"E) of the Baishan Basin, showing the positions of the ostracod samples and abundances of ostracod species recovered from the Xiaonangou Formation.

FIGURE 4. A–F. Lycopterocypris sinuolata Zhang, 1985, A, left lateral view of carapace (NIGP 206917), sample 2024-XNG- 11, B, right lateral view of carapace (NIGP 206918), sample 2024-XNG-11, C, left lateral view of carapace (NIGP 206918), sample 2024-XNG-11, D, dorsal view of carapace, anterior to left (NIGP 206919), sample 2024-XNG-10A, E, right lateral view of carapace (NIGP 206920), sample 2024-XNG-11, F, left lateral view of carapace (NIGP 206920), sample 2024-XNG-11; G–H. Lycopterocypris sp., G, right lateral view of carapace (NIGP 206921), sample 2024-XNG-10A, H, left lateral view of carapace (NIGP 206921), sample 2024-XNG-10A; I–R. Candona praevara Zhang & Zhang, 1982, I, right lateral view of carapace (NIGP 206922), sample 2024-XNG-11, J, ventral view of carapace, anterior to left (NIGP 206922), sample 2024-XNG-11, K, left lateral view of carapace (NIGP 206923), sample 2024-XNG-11, L, dorsal view of carapace, anterior to left (NIGP 206923), sample 2024-XNG-11, M, dorsal view of carapace, anterior to left (NIGP 206924), sample 2024-XNG-11, N, right lateral view of carapace (NIGP 206925), sample 2024-XNG-11, O, left lateral view of carapace (NIGP 206925), sample 2024-XNG-11, P, left lateral view of carapace (NIGP 206926), sample 2024-XNG-10A, Q, left lateral view of carapace (NIGP 206927), sample 2024-XNG-10A, R, right lateral view of carapace (NIGP 206927), sample 2024-XNG-10A. Scale bars = 100 μm.