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Species / Tessarolax Japonicus


Original Description of Tessarolax japonicus by Yabe and Nagao, 1928

  • "Shell fusiform; spire nearly as high as aperture, and incrusted by a deposit, so as to obliterate the sutures as well as the ornamentations. Whorls of spire about 6, each bearing a prominent spiral carina lying a little below the middle; flattened above and concave below the carina. Upper part of spire thickly incrusted and with a varix-like process, which is flattened on both sides and lies on the line opposite to the outer lip. Body whorl inflated, ornamented with four spiral carinae, two prominent and two narrower; angulated along the two prominent carinae, which diverge near the aperture; one of the narrower carinae situated between the prominent ones, and the other in the upper part of the base. Aperture broad above and contracted below; anterior canal lost but probably elongated, and the posterior one narrow, running beside the spire for the most part; columella incrusted, without folds; outer lip expanded showing a tendency of the two prominent carinae of the body whorl to be prolonged into two long spines."

Locus typicus: The upper course of the Ikushunbets and the ShiyŻbari, a tributary of the YŻbari-gawa, Province of Ishikari, Japan

Stratum typicum: Cretaceous

Types: Holotype IGPS no. 22636

History and Synonymy


Tessarolax japonicus Nagao, 1932, pl. VI, fig. 11, 11a

  • Upper Ammonite Beds; Sakai-zawa, a tributary of the Abeshinai, province of Teshio

Specimens from private collections

Tessarolax cf. japonicus Yabe and Nagao, 1928; Santonian, Cretaceous; Nakafutama-Zawa, Haboro-Cho, Tomamaegun, Hokkaido, Japan; Coll. Ulrich Wieneke

Tessarolax japonicus Yabe and Nagao, 1928; Turonian, Cretaceous; Yubari City, Hokkaido Prefecture, Hokkaido Island, Japan; Coll. Tsuruga Hirofumi

Tessarolax japonicus Yabe and Nagao, 1928; Turonian, Cretaceous; Yubari City, Hokkaido Prefecture, Hokkaido Island, Japan; Coll. Tsuruga Hirofumi


  • Alabushev, A. 1995. Sedimentary formations of the Cretaceous Sakhalin Basin (Far East Asia); Geol Rundsch 84: 237.
  • Kaim, A., Jenkins, R.G., and Hikida, Y. 2009. Gastropods from Late Cretaceous Omagari and Yasukawa hydrocarbon seep deposits in the Nakagawa area, Hokkaido, Japan. Acta Palaeontologica Polonica 54 (3) 463Ė490. DOI: 10.4202/app.2009.0042; Fulltext
  • Poyarkova, Z.N. & M.R. Dzhalilov, 1985. Morskie gastropody mela okrain Azii. 168 pp., 24 pls. DVNC Acad. Nauk SSSR, Vladivostok. [Marine gastropods of Cretaceous in the Asian margins.] (In Russian), Fulltext
  • Poyarkova, Z.N. [Ed.] 1987. Reference Section of Cretaceous Deposits in Sakhalin (Naiba Site) (Nauka, Leningrad, 1987) [in Russian], Trans. Acad. Sci. USSR. Leningrad, 16, 1-197, Fulltext
  • Yabe, Hisakatsu 1927. Cretaceous Stratigraphy of the Japanese Islands; Sci. Repts. Tohoku Imper. Univ., Sendai, Japan, 2nd ser., vol. 11 (1927), 27-100, Fulltext
  • H. Yabe & T. Nagao, 1928


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