Orthoconic cephalopod -- T. crebriseptum?

Kingdom: Animalia

Phylum: Mollusca

Class: Cephalopoda

Order: Orthocerida

Family: Proteoceratidae

Genus: Treptoceras

Species: T. crebriseptum

Author Citation: Hall (1847) [then known as Actinoceras crebriseptum]

Eon: Phanerozoic

Era: Paleozoic

Period: Ordovician

Sub Period: None

Epoch: Late

Georgian Bay Formation

Mimico Creek

Toronto

Ontario, Canada

Field collection by Camille Martin on 09/14/2021

Comments:

Sephuncle segment compression ratio (SCR) = 1.0 EQUIAXIAL

T. crebriseptum is a species of Treptoceras found in the Georgian Bay Formation at Toronto.

See Robert C. Frey, "Middle and Upper Ordovician Nautiloid Cephalopods of the Cincinnati Arch Region of Kentucky, Indina, and Ohio" (1995) 25-26, 45.