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Allonautilus

Genus of cephalopods

Summary

Genus of cephalopods

Allonautilus perforatus

The genus Allonautilus contains two species of nautiluses, which have a significantly different morphology from those placed in the sister taxon Nautilus. Mitogenome comparisons between Allonautilus and Nautilus confirm this split as the oldest divergence among living nautiloids, justifying their placement in separate genera.

Live individuals of Allonautilus scrobiculatus have only been collected in Papua New Guinea and the Solomon Islands. Little is known about their biology because they live in deep waters, whereas the better-understood genus Nautilus lives closer to the surface. Allonautilus perforatus is only known from shells washed ashore with no observations of live specimens to date. Despite the rarity of live sightings of individuals of this genus, genetic diversity among the limited collected live samples indicate relatively large populations persisting for at least Allonautilus scrobiculatus.

The entire family Nautilidae, including all species in the genus Nautilus and Allonautilus, was listed on Appendix II of the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES).

Species

ImageScientific nameCommon nameDistribution
[[File:Allonautilus perforatus.jpg120px]]Allonautilus perforatusBali
chambered nautilusBali
Papua New Guinea
[[File:Allonautilus scrobiculatus.jpg120px]]Allonautilus scrobiculatusCrusty nautilusPapua New Guinea
Solomon Islands

References

References

  1. Ward, P.D. & W.B. Saunders 1997. [https://www.jstor.org/stable/1306604 ''Allonautilus'': a new genus of living nautiloid cephalopod and its bearing on phylogeny of the Nautilida]. ''Journal of Paleontology'' '''71'''(6): 1054–1064.
  2. Barred, G.J., et al. (2023). [https://zookeys.pensoft.net/article/84427/ Three new species of Nautilus Linnaeus, 1758 (Mollusca, Cephalopoda) from the Coral Sea and South Pacific.] ''ZooKeys'' 1143 51-69.
  3. Groth, J. G., et al. (2015). [http://digitallibrary.amnh.org/bitstream/handle/2246/6589/N3834.pdf?sequence=1&isAllowed=y The mitochondrial genome of ''Allonautilus'' (Mollusca: Cephalopoda): Base composition, noncoding-region variation, and phylogenetic divergence.] ''American Museum Novitates'' 3834 1-18.
  4. "Checklist of CITES species".
Wikipedia Source

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