Protoconch morphology of Conoteuthis (Diplobelida, Coleoidea) and its implications on the presumed origin of the Sepiida

2012 | journal article. A publication with affiliation to the University of Göttingen.

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​Protoconch morphology of Conoteuthis (Diplobelida, Coleoidea) and its implications on the presumed origin of the Sepiida​
Fuchs, D.; Keupp, H. & Wiese, F. ​ (2012) 
Cretaceous Research34 pp. 200​-207​.​ DOI: https://doi.org/10.1016/j.cretres.2011.10.018 

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Authors
Fuchs, Dirk; Keupp, Helmut; Wiese, Frank 
Abstract
The phylogenetic origin of the Sepiida is still unclear. The presumed derivation from diplobelid belemnoids can be tested by comparison of their initial chambers (protoconchs). The first investigation of a juvenile phragmocone of the diplobelid Conoteuthis hayakawai from the Cenomanian of Hokkaido (northern Japan) yielded surprising insights into the internal protoconch morphology of the Diplobelida. The Conoteuthis protoconch exhibits in many aspects a mosaic of the belemnitid and the spirulid protoconch types. Whereas the sepiid protoconch represents most probably a modification of the spirulid type, the Conoteuthis protoconch is unique in having a closed (imperforated) proseptum. Apart from this, Conoteuthis differs in many other characters from the earliest sepiids (Ceratisepia, Belosepia), which makes a closer relationship unlikely. (C) 2011 Elsevier Ltd. All rights reserved.
Issue Date
2012
Journal
Cretaceous Research 
Organization
Abteilung Geobiologie ; Courant Forschungszentrum Geobiologie ; Geowissenschaftliches Zentrum ; Fakultät für Geowissenschaften und Geographie 
ISSN
0195-6671
Sponsor
German Research Foundation [FU 762/1-1]

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