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Nautilus macromphalus
Nautilus macromphalus Sowerby, 1848
Bellybutton nautilus
Nautilus macromphalus
photo by FAO

Family:  Nautilidae (chambered nautiluses)
Max. size:  16 cm SHD (male/unsexed)
Environment:  reef-associated; marine; depth range 0 - 500 m
Distribution:  Western Pacific.
Diagnosis:  Umbilicus has deep, round-shouldered concavity (Ref. 346), not filled with a concretion; reduced color markings on shell (Ref. 275).
Biology:  Consumed by artisanal fishers and supports small fisheries for private and public aquaria and research trade (Ref. 346). Occurs at depths of 0 to 500 m on the continental shelf and slope. Broken shell washed up on beach (Ref. 88739). Has poor vision; instead, utilizes scent and touch to recognize and look for food. At night, it actively forages at 20 m depth. It adjusts gases contained in its chambered body to facility vertical movement (Ref. 101162).
IUCN Red List Status: Not Evaluated (N.E.) Ref. 123251)
Threat to humans: 
Country info:   
 

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