Izumonauta

Izumonauta
Temporal range: Miocene
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Order: Octopoda
Superfamily: Argonautoida
Family: Argonautidae
Genus: Izumonauta
Kobayashi, 1954
Species
  • Izumonauta lata
    Kobayashi, 1954
  • Izumonauta kagana
    Kaseno, 1955
  • Izumonauta kasataniensis
    Kaseno, 1955

Izumonauta is an extinct genus of shelled octopods from the Mid to Late Miocene of Japan and New Zealand.[1]

The keels of Izumonauta eggcases lack tubercules and are intermediate in morphology between those of the earlier Obinautilus and later Argonauta.[2]

The New Zealand fossil material was described from the Kapitean Stage (uppermost Miocene).[3]

References

  1. Kobayashi, T. (1954). Izumonauta, a new genus of the Argonautinae, with a note on their rare but gregarious fossil occurrence. Japanese Journal of Geology and Geography 25: 21-34.
  2. 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.
  3. Marshall, B.A. (1971). Izumonauta (Argonautidae, Cephalopoda, Coleoida) from the Kapitean Stage (Uppermost Miocene) of New Zealand. New Zealand Journal of Geology and Geophysics 14: 288-292.

Further reading

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