Mimachlamys miurensis (Yokoyama, 1920)
YOKOYAMA, M. 1920. Fossils from the Miura Peninsula and its inmediate North. Journal of the College of Science, Imperial University of Tokyo, 36 (6): 1-193, pls. 1-19, 1 map. [p. 157, pl. 12, figs. 2-6]
1920 Pecten miurensis Yokoyama, 1920
M. Yokoyama, 1920, plate 12.
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«Shell large, rather solid, compressed, inequivalve, the right valve more convex than the very flattened left valve, nearly equilateral, roundly ovate in form, somewhat higher than long. Surface with about twenty-five smooth, rounded, radiating ribs separated by intervals of about an equal breadth in which there is a single interstitial riblet with traces of distant scales. Ears unequal, the anterior being the largest, both ornamented with granular radial riblets.
There are several speci mens of this species, but the preservation is bad, though .snfficient to show that they belong to a still undescribed species. The largest right valve measures about 130 millim. in height. One of the right valves, comparatively well preserved, is abuut 85 millim. high, 75 millirn. long and 8-9 millim. in depth. Rather frequent at Zushi. Fossiloccurrence.— Miyata Zone (Harashita in Shimo-Miyata); Yokosuka Zone (Zushi).» MATAJIRO YOKOYAMA, 1920
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«Pecten miurensis Yokoyama, 1920 from the uppermost Miocene–lower Pliocene Zushi Formation in the Miura Peninsula, central Japan, is another allied species, but is distinguished from Ch. (N.) kaneharai in having rounded and a greater number of (ca 26) radial ribs without bifurcation or trifurcation. As the former species does not have any shagreen microsculpture, it is probably referable to the genus Mimachlamys Iredale, 1929 (type species: Pecten asperrimus Lamarck, 1819, by original designation).»
MATSUBARA, T., I. NORO, Y. MATSUURA & T. IRIZUKI. 2014. Miocene Mollusca from the Ichibu Formation on Nishinoshima Island, Oki Islands, Southwest Japan. Paleontological Research, 18 (1): 6-32, figs. 1-11. [p. 19]
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