Geisonoceratidae

Geisonoceratidae
Temporal range: M Ordovician - M Devonian, ?L Cret
Fossil of Geisonoceras species
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Order: †Orthocerida
Family: †Geisonoceratidae
Zhuravleva, 1959
Genera

Geisonoceratidae is an extinct family of orthoceroid cephalopods endemic to what would be Asia, Europe, and North America from the Middle Ordovician to the Middle Devonian[1] living from about 470—380 mya, existing for approximately 90 million years. With the possible addition of an Early Cretaceous orthocerid from the western Caucasus [2] the range of this group increases dramatically to some 350 million years, thus making it one of the longest lived families of the Nautiloidea.

  1. ^ Sweet, W. C. 1964. Nautiloidea- Orthocerida; Treatise on Invertebrate Paleontology Part K, Teichert & Moore eds; pp K224- K242
  2. ^ Doguzhaeva, Larisa. (1994) An Early Cretaceous orthocerid cephalopod from north-western Caucasus.; Palaeontology 37(4): 889-899