Biology:Phragmoteuthida

Short description: Extinct order of molluscs

Phragmoteuthida Temporal range: Permian - Jurassic
Comparation of hard parts of Phragmoteuthida, Belemnitida and Diplobelida
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Superorder:	†Belemnoidea
Order:	†Phragmoteuthida Jeletzky in Sweet, 1964
Families
See text.

Phragmoteuthida is an order of extinct coleoid cephalopods characterized by a fan-like teuthoid pro-ostracum attached to a belemnoid-like phragmocone.

Diagnosis

Jeletzky characterized phragmoteuthids as having a large tripartite, fanlike pro-ostracum forming the longest portion of the shell, attached to about three-quarters of the circumference of a comparatively small breviconic phragmocone with short camerae and superficially belemnitid-like siphuncle, an absent or much reduced rostrum at the apical part of the phragmocone, belemnite-like arm hooks, an ink sack, beaks resembling those of Recent teuthids, and a muscular mantle.

Donovan (2006), gives a similar description for Phragmoteuthis: Phragmocones as having an apical angle of between 20 and 30 degrees, and relatively few chambers compared with belemnoids; a multi-layered conotheca, thick-walled siphuncle, and a long, three-lobed pro-ostracum as in the Triassic species. Arms are short and bear pairs of slightly curved hooks.

Classification

• Order †Phragmoteuthida
  • Family †Phragmoteuthididae
    • Genus †Permoteuthis
    • Genus †Phragmoteuthis
    • "unnamed form"
  • Family †Rhiphaeoteuthidae
    • Genus †Rhiphaeoteuthis

References

Wikidata ☰ Q7188058 entry