Carcharodon carcharias (Linné) -shark teeth- from the Pliocene Na-arai formation, Choshi Peninsula, environs of Tokyo, Japan | Bulletin of the Mizunami Fossil Museum No. 2

Bulletin of the Mizunami Fossil Museum No. 2

Carcharodon carcharias (Linné) -shark teeth- from the Pliocene Na-arai formation, Choshi Peninsula, environs of Tokyo, Japan

Junji Itoigawa, Hiroyuki Nishimoto, Masanao Kuroda, Hiroyasu Horie, Atsushi Naruse and Yasunari Watanabe

BMFM02-009Itoigawa et al., 1975（PDF 4.45MB）

Itoigawa et al. (1975b) print-version

Published: 1975/12/25 　 Page: 91–102, pls. 19–22

Elasmobranchus specimens collected from the Pliocene Na-arai formation are studied taxonomically and statistically. It is concluded that a. Carcharodon rondeletii (Müller and

Henle) is synonimous to C. carcharias (Linné), b. Japanese specimens from the Neogene and Quaternary formations belong to Carcharodon megalodon (Agassiz) and C. Carcharias (Linné), c. C. megalodon is the representative of the Miocene,and the Pliocene and Quaternary

one is C. carcharias.

The difference in two species of Carcharodon is seen in the results of measurement of some features as follows;

OCH/OCL (mean) C. carcharias 1.15 > C. megalodon 0.64

number of serration in 10 mm (mean) C. carcharias 11.6–11.7 < C. megalodon 14.8–16.1