著者

上野 輝彌 坂本 一男 坂本 治

出版者

国立科学博物館

雑誌

Bulletin of the National Science Museum. Series C, Geology & paleontology (ISSN:0385244X)

巻号頁・発行日

vol.20, no.4, pp.149-155, 1994-12

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A fossil scombrid fish from the Middle Miocene Nagura Formation, Chi-chibumachi Group, Saitama Prefecture, Japan, previously reported as Scomberomorus sp. is now described as a new species S. chichibu. This was determined based on the following characters : the temporal ridge reaching to the level of the posterior end of the ethmoid; a wide, short fenestra between the frontals (the ratio of its width to length is about 1 : 3); and the moderately forked anterior portion of the ethmoid.