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.
On the other hand, Jennifer Nouri was wowed to learn that a smooth black rock with a stunning white imprint - originally found in Morocco - turns out to be a 400 million-year-old orthocone nautiloid
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.
Only one nautiloid
group survived the massive extinctions that also destroyed the dinosaurs.
species, Cimomia ozani new species and Eutrephoceras dekayi (Morton), are described from the Campanian Ozan Formation of the Taylor Group in northeast Texas.
Apart from Dawsonoceras and the Silurian coiled-shell nautiloid
Peismoceras Hyatt, no shell colouration was documented in any other species with highly elaborated sculpture.
A very peculiar specimen of a nautiloid
phragmocone was found close to the root-bearing surface (Figs 1B, 2E).
Ordovician and Silurian nautiloid
cephalopods from Anticosti Island: traject across the Ordovician-Silurian (O-S) mass extinction boundary.
Noteworthy is the occurrence of nautiloid
conchs and specific echinoderm columnals (Fig.
Mergl (2002) proposed that the generally poorly fossiliferous shales with phyllocarids (Caryocaris), graptolites, conulariids, nautiloids
and trilobites should be classified as the Rafanoglossa Community within his Paterula Community Group.
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).