Dimorphism of late Cretaceous false-puzosiine ammonites, Yokoyamaoceras Wright and Matsumoto, 1954 and Neopuzosia Matsumoto, 1954

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Abstract

Yokoyamaoceras jimboi Matsumoto, previously assigned to the Kossmaticeratidae, and Neopuzosia ishikawai (Jimbo), N. japonica (Spath), and N. haboroensis Matsumoto and Inoma, previously assigned to the Puzosiinae, all co-occurring in Santonian to lower Campanian deposits of the Upper Cretaceous Yezo Group in Hokkaido, Japan, and Sakhalin, Russia, are reinvestigated on the basis of many well-preserved specimens. Observations on the stratigraphic occurrence, morphological variation, and shell ontogeny show these four nominal species to be dimorphs of but a single biospecies. A dimorphic lineage can be traced back to certain upper Turonian-Coniacian Kossmaticeras <M> and Yokoyamaoceras <m> species. The superficial morphological resemblance between the species and Mesopuzosia spp. is mere homeomorphy. -from Author

Original languageEnglish
Pages (from-to)97-128
Number of pages32
JournalTransactions & Proceedings - Palaeontological Society of Japan
Volume169
Publication statusPublished - Jan 1 1993
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

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