Ammonoids are a group o extinct marine mollusc ainimals in the subclass Ammonoidea o the cless Cephalopoda. Thir molluscs, commonly referred tae as ammonites, are mair closely related tae leevin coleoids (i.e., octopuses, ink-fish, an cuttlefish) nor thay are tae shelled nautiloids sic as the leevin Nautilus species.[1] The earliest ammonites appear in the Devonian, an the last speshies dee'd oot in the Cretaceous–Paleogene extinction event.

Temporal range: 409–66 Ma
Artist's reconstruction o Asteroceras
Scientific classification e
Kinrick: Animalia
Phylum: Mollusca
Cless: Cephalopoda
Subcless: Ammonoidea
Zittel, 1884

References eedit

  1. Klug, Christian; Kröger, Björn; Vinther, Jakob; Fuchs, Dirk (August 2015). "Ancestry, Origin and Early Evolution of Ammonoids". In Christian Klug; Dieter Korn; Kenneth De Baets; Isabelle Kruta; Royal H. Mapes (eds.). Ammonoid Paleobiology: From macroevolution to paleogeography. Topics in Geobiology 44. Springer. p. 3-24. doi:10.1007/978-94-017-9633-0_1.