- Obinautilus
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Obinautilus
Temporal range: Oligocene – Pliocene
Obinautilus awaensis Scientific classification Kingdom: Animalia Phylum: Mollusca Class: Cephalopoda Order: Octopoda Superfamily: Argonautoida Family: Argonautidae Genus: Obinautilus
Kobayashi, 1954Species - Obinautilus awaensis
(Tomida, 1983) - Obinautilus pulcher
Kobayashi, 1954
Obinautilus is an extinct genus of shelled octopods from the Late Oligocene to Late Miocene of Japan.[1] The shell is discoidal and very involute, with rapidly expanding and compressed whorls, fine radial ribs, a rounded venter with a shallow furrow, and almost closed umbilicus.
Based on the examination of O. pulcher fossils from the Oligocene, the Tremoctopus-Argonauta divergence has been calculated to have occurred at least 29 million years ago.[2]
References
- ^ Saul, L. & C. Stadum (2005). "Fossil Argonauts (Mollusca: Cephalopoda: Octopodida) From Late Miocene Siltstones Of The Los Angeles Basin, California". Journal of Paleontology 79 (3): 520–531. doi:10.1666/0022-3360(2005)079<0520:FAMCOF>2.0.CO;2. http://apt.allenpress.com/aptonline/?request=get-abstract&issn=0022-3360&volume=079&issue=03&page=0520.
- ^ Strugnell, J., J. Jackson, A.J. Drummond & A. Cooper (2006). Divergence time estimates for major cephalopod groups: evidence from multiple genes. Cladistics 22 (1): 89-96.
Further reading
- Yanagisawa, Y. 1990. Age of fossil Argonautidae (Cephalopoda) from Hokuriku Province (central Honshu, Japan) based on diatom biostratigraphy.PDF (1.90 MiB) Bull. Geol. Surv. Japan 41 (3): 115-127.
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