Allonautilus
Genus of cephalopods
From Wikipedia, the free encyclopedia
The genus Allonautilus contains two species of nautiluses, which have a significantly different morphology from those placed in the sister taxon Nautilus.[1] Mitogenome comparisons between Allonautilus and Nautilus confirm this split as the oldest divergence among living nautiloids, justifying their placement in separate genera.[2]
| Allonautilus | |
|---|---|
| |
| Allonautilus scrobiculatus shell with periostracum removed | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | Nautiloidea |
| Order: | Nautilida |
| Family: | Nautilidae |
| Genus: | Allonautilus Ward & Saunders, 1997 |
| Type species | |
| Allonautilus scrobiculatus | |
| Species | |
|
Allonautilus scrobiculatus Allonautilus perforatus | |
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.[3]
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).[4]
Species
| Image | Scientific name | Common name | Distribution |
|---|---|---|---|
 | Allonautilus perforatus | Bali chambered nautilus | Bali Papua New Guinea |
 | Allonautilus scrobiculatus | Crusty nautilus | Papua New Guinea Solomon Islands |