Phragmoteuthida

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Phragmoteuthida
Temporal range: Permian - Jurassic
Phragmoteuthis conocauda 1.JPG
Phragmoteuthis conocauda
Scientific classification e
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Cohort: Belemnoidea
Order: Phragmoteuthida
Jeletzky in Sweet, 1964
Families

Family

Phragmoteuthida is an order of coleoid cephalopods[1] characterized by a fan-like teuthoid pro-ostracum attached to a belemnoid-like phragmocone.

Diagnosis[edit]

Jeletzky[1] characerized 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 from the Jurassic of Dorset, England. Notes 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[edit]

References[edit]

  1. ^ a b Doguzhaeva, L. 2002. Adolescent bactritoid, orthoceroid, ammonoid and coleoid shells from the Upper Carboniferous and Lower Permian of the South Urals. PDF Abhandlungen der Geologischen Bundesanstalt 57: 9–55.
  • D.T. Donovan 2006. Phragmoteuthida (Cephalopoda: coleoidea) from the Jurassic of Dorset, England. Palaeontology Vp; 49 Issue 3 pp 673 -684 May 2006. [1]