Nautiloid a. : Like or pertaining to the nautilus; shaped like a nautilus shell.

Nautiloid n. : A mollusk, or shell, of the genus Nautilus or family Nautilidae.

Example:
Serious answers only-I need a good name for an alien race of Nautiloid creatures?

Taxonomy
nautiloids, shell, cephalopods, nautiloid, Nautiloidea, nautiluses, fossil, ammonoids, subclass, species, siphuncle, animals, sutures, diversity, coleoids, Nautilida, free encyclopedia, Late Cambrian.

Defination from the web:
nautiloid Trilacinoceras from the Ordovician of China. ... Apart from that exception, only a single nautiloid suborder, the Nautilina, continued throughout the Mesozoic, where they co-existed quite ...