Biology:Megalytoceras

Short description: Genus of molluscs (fossil)

Megalytoceras Temporal range: Toarcian–Bajocian PreЄ Є O S D C P T J K Pg N
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	†Ammonoidea
Order:	†Ammonitida
Family:	†Lytoceratidae
Subfamily:	†Megalytoceratinae
Genus:	†Megalytoceras Buckman, 1905
Species
M. amplum M. rasile M. rubescens

Megalytoceras is an extinct genus of ammonite from the middle Jurassic, belonging to the suborder Lytoceratina.

The shell of Megalytoceras is evolute and grew to be fairly large, to as much as 24.5 cm. (8 3/4 in.) in diameter in M. amplum, from the Aalenian of France. Early whorls are elliptical in section and bear periodic flares. Later, or outer, whorls are smooth with convergent sides. The outer rim, or venter, is rounded. Embracement of previous whorls by the next is slight to mild. The umbilicus is rather wide, with an abrupt edge.

Megalytoceras and its close relative Metrolytoceras are included in the Megalytoceratinae

Distribution

Only found at Cerro Mendez, Opalinum Zone, Andalucia (Jurassic of Spain)

External links

• Megalytoceras BUCKMAN, 1905 (in French)
• Megalytoceras amplum (in French)

References

Notes

Bibliography

• Arkell, W.J.; Kummel, B.; Wright, C.W. (1957). Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology, Part L, Mollusca 4. Lawrence, Kansas: Geological Society of America and University of Kansas Press. 

Wikidata ☰ Q6808588 entry