Aenigmacaris cornigerum SCHRAM & HORNER, 1979

By oilshale (edited)

• September 21, 2016

Taxonomy

Kingdom: Animalia
Phylum: Arthropoda
Class: Malacostraca
Order: Aeschronectida
Family: Aenigmacarididae
Genus: Aenigmacaris
Species: Aenigmacaris cornigerum
Author Citation SCHRAM & HORNER, 1979

Geological Time Scale

Eon: Phanerozoic
Era: Paleozoic
Period: Carboniferous
Sub Period: Mississippian
Epoch: Late
International Age: Serpukhovian

Stratigraphy

Big Snowy Group
Heath Formation
Bear Gulch Bed

Provenance

Acquired by: Purchase/Trade

Dimensions

Length: 8 cm

Location

Bear Gulch
Fergus County
Montana
United States

• bear gulch
• carboniferous
• fergus
• heath formation
• montana
• tff-oilshale-ar472

Comments

Taxonomy from Factor & Feldman 1985.

Diagnosis from Factor & Feldman 1985 p. 339: "Malacostracan with thinly sclerotized carapace; prominent anteriorly directed mid-dorsal spine; antero-dorsal and antero-ventral spines present. Ventral margins of abdominal pleura triangular, smooth. Third abdominal segment with strong dorsal flexure."

Line drawing from Factor & Feldman 1985, p. 342:

Bar represents 1 cm.

Identified by oilshale

References:
Schram, F., Horner, J. (1979) Crustacea of the Mississippian Bear Gulch Limestone of Central Montana. Journal of Paleontology Vol. 52, No. 2 (Mar., 1978), pp. 394-406.
Factor D. F. and Feldmann R. M. (1985): Systematics and Paleoecology of Malacostracan Arthropods in the Bear Gulch Limestone (Namurian) of central Montana. Carnegie Museum of Natural History. 54, 319-356.
Jenner, R. A., Hof, C. and Schram, F. R. (1998): Palaeo- and archaeostomatopods (Hoplocarida, Crustacea) from the Bear Gulch Limestone, Mississippian (Namurian), of central Montana. Contributions to Zoology 67 (3) 155-185.