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Any of various marine cephalopod mollusks formerly classified in the subclass Nautiloidea, including the nautiluses and numerous extinct species known only from fossils.

[From New Latin Nautiloīdea, former subclass name : Latin nautilus, nautilus; see nautilus + Greek -oeidēs, -oid.]

nau′ti·loid adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Animals) any mollusc of the Nautiloidea, a group of cephalopods that includes the pearly nautilus and many extinct forms
(Animals) of, relating to, or belonging to the Nautiloidea
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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At Early Paleocene the transgression of sea emerged which deposited the Sangiali Group like carbonate shallow marine limestone and shale (fossil bearing like bivalves nautiloids and gastropods) of Sangiali Formation deltaic siliciclastic Rakhi Gaj Formation and coral reef deposits of Dungan Limestone.
Shell organic inclusions have also been used to make dietary comparisons between modern and fossil nautiloids (Kashiyama et al.
All of the hundreds of species of nautiloids, except four species of Nautilus, disappeared as living things ages before man came into existence upon the earth" (193).
All modern cephalopods are carnivorous predators or scavengers, and before big fish evolved, nautiloids (nautilus relatives) would have been among the major predators in the seas--some nautiloid shells from the Ordovician period measured up to three metres in length.
Among the fossils are a variety of creatures from sponges, worms and nautiloids to solitary hydroids, also known as the flowers of the sea.
Fossils of nautiloids (an ancestor of the giant squid) dug up during the building of the new centre are set into the floor of the building; a reconstructed Stone Age roundhouse sits on the site of a crannog (a prehistoric dwelling built on an artificial island in a lake); and the reserve's spectacular new glass-sided bird observatory sits above lime kilns that provided many of the bricks that built Belfast.
Then he witnesses the rise and fall of intelligent species in many worlds, including exotic hive minds, plant men, "nautiloids," and intelligent stars.
The fossils being referred to are orthocone nautiloids, Rayonnoceras sp., that occur in the top ten feet or so of the Whitmore Wash Member of the Redwall Limestone in Nautiloid Canyon and elsewhere in the Grand Canyon region (Fig.
In the Soeginina Beds distinct transgressive features appear compared to the underlying Vesiku Beds: rich normal marine fauna (corals, nautiloids) and numerous bivalves, gastropods, and calcareous algae (Solenopora).