Plate P2. SEM images. Scale bars = 100 µm. Arrows = anterior direction. 1. Aversovalva formosa Coles and Whatley, Specimen MPC-15261, adult left valve (external view). 2. Cytheropteron americanum Yamaguchi, Matsui, and Nishi, Specimen MPC-15262, adult right valve (external view). 3. Pelecocythere sp., Specimen MPC-15263, adult right valve (external view). 4. Eucythere sp., Specimen MPC-15264, adult right valve (external view). 5–8. Krithe crassicaudata van den Bold; (5, 6) Specimen MPC-15266, adult left valve (5: external view, 6: dorsal view); (7, 8) Specimen MPC-15265. juvenile left valve (7: external view, 8: dorsal view).
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