Perilytoceras

Perilytoceras is a genus of ammonoid cephalopods belonging to the family Lytoceratidae.^[1]

Perilytoceras Temporal range: Upper Toarcian PreꞒ Ꞓ O S D C P T J K Pg N
Fossil shell of Perilytoceras species from Tulear (Madagascar)
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	†Ammonoidea
Order:	†Ammonitida
Family:	†Lytoceratidae
Subfamily:	†Megalytoceratinae
Genus:	†Perilytoceras Rulleau, 1997

These fast-moving nektonic carnivores lived in the Toarcian age (from 182.7 to 174.1 million years ago). Shells could reach a diameter of 20–25 centimetres (7.9–9.8 in).^[2]