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  • Aenigmacaris cornigerum SCHRAM & HORNER, 1979




    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


    Big Snowy Group
    Heath Formation
    Bear Gulch Bed


    Acquired by: Purchase/Trade


    Length: 8 cm


    Bear Gulch
    Fergus County
    United States


    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

    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.

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