By Yanin B.T.

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Shell interior in the genera Litschkovitrigonia, Quadratotrigonia, Pterotrigonia, and Linotrigonia: (a) Litschkovitrigonia inguschensis, left valve, x2 (PI. 5, fig. 7c); (b) Quadratotrigonia nodosa orbignyana, left valve, x l (PI. 6, fig. 10); (c) Pterotrigonia caudata, right valve, x2 (PI. 9, fig. 14); (d, e) Linotrigonia belbekensis, x2: (d) left valve (PI. 10, fig. 8b); (e) right valve (PI. 10, figs. 4, posterior adductor scar and tooth 3b are partly broken off). The preserved structures of the valves are shown only.

8). The area is narrow (half the width of the flank), flatĀ­ tened, with numerous thin transverse costae, which are often similar to wrinkles of growth. On the median groove, the costae are usually interrupted. In some specimens, the area possesses only growth lines near the posterior margin (PI. 4, fig. 4a). The median groove is sharply pronounced and is filiform. The escutcheon is smooth, narrow, strongly deepened along the escutcheon carina, but flattened and slightly elevated along the dorĀ­ sal margin.

132, pi. 1, fig. 2; 1960, p. 205, pi. 19, figs. 3 and 4; Bogdanova, 1966, p. 110; 1988, p. 154, pi. 30, figs. 4 and 5; pi. 31, figs. 1 and 2; Bogdanova et al, 1997, p. 82, pi. 19, figs. 4 and 5. Myophorella (Myophorella) loewinsonlessingi: Saveliev 1958, p. 199, pi. 2, figs. 2-4; pi. 3, fig. 2; Yanin, 1979a, p. 24, pi. 2. fig. I. Myophorella (Myophorella) invittulina: Saveliev, 1958, p. 205, pi. 3, fig. 3; pi. 4, figs. 1 and 2. Myophorella figs. 4 and 5. invittulina: Bogdanova, 1988, p. 155, pi.

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Early Cretaceous Trigoniids of the Crimea by Yanin B.T.

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