プラビトセラス シグモイダーレ　Pravitoceras sigmoidale (part 1)

3D Model

標本　Specimen: OMNH MI-2177-1

産地　Occurrence: 淡路島　Awaji Island, Hyogo Prefecture, Japan

地質年代　Geological age: 白亜紀後期カンパニアン期　Campanian, Late Cretaceous

備考　Note: この標本は、プラビトセラス シグモイダーレの気室部です。一見、正常巻きのアンモナイトのように見えます。A part of a well preserved specimen of Pravitoceras sigmoidale Yabe, 1902 which is one of unique heteromorph ammonoids of Japan.

関連資料　Related publications

• Matsumoto, T. et al. (1981) Note on Pravitoceras sigmoidale (Cretaceous heteromorph ammonite). Transactions and Proceedings of the Palaeontological Society of Japan, New series 123: 168-178.

• Morozumi, Y. (1985) Late Cretaceous (Campanian and Maastrichtian) ammonites from Awaji Island, Southwest Japan. Bulletin of Osaka Museum of Natural History 39: 1-58.

• Wright, C.W. et al. (1996) Treatise on Invertebrate Paleontology Part L Mollusca 4 Revised Volume 4: Cretaceous Ammonoidea, 362 p. Geological Soceity of America. (The specimen is in figure 193 on page 249)