Devonohelicoceras hidaense, a new torticonic oncocerid (Cephalopoda) from the Lower Devonian of Central Japan

Based on the four specimens from the Lower Devonian (Emsian?) D4 Member of the Fukuji Formation, and a specimen from an unknown locality, a new genus and species of the oncocerid cephalopod, Devonohelicoceras hidaense, is described as the second known oncocerid from Japan. The present genus is most...

Full description

Saved in:
Bibliographic Details
Published inProceedings of the Japan Academy, Series B Vol. 79B; no. 7; pp. 201 - 206
Main Authors NIKO, Shuji, NISHIDA, Tamio
Format Journal Article
LanguageEnglish
Published The Japan Academy 2003
Subjects
Actinosiphonate deposits
Cephalopoda
D. hidaense sp. nov
Devonohelicoceras gen. nov
Fukuji Formation
Lower Devonian
Oncocerida
INW, Japan
Online AccessGet full text

Cover

More Information
Summary:Based on the four specimens from the Lower Devonian (Emsian?) D4 Member of the Fukuji Formation, and a specimen from an unknown locality, a new genus and species of the oncocerid cephalopod, Devonohelicoceras hidaense, is described as the second known oncocerid from Japan. The present genus is most similar to the Late Silurian genus Foersteoceras, but differs in its weakly depressed whorl section, submarginal siphuncle with positional shifting, and well-developed actinosiphonate deposits. It is likely that the actinosiphonate deposits functioned as a substratum of adhesive liquid which has a lower specific gravity than the sea water. (Communicated by Tatsuro MATSUMOTO, M. J. A., Sept. 12, 2003)
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0386-2208
1349-2896
DOI:10.2183/pjab.79B.201