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  • Discoserra pectinodon LUND, 2000


    Images:

    oilshale

    Taxonomy

    Kingdom: Animalia
    Phylum: Chordata
    Class: Actinopteri Cope 1871
    Order: Guildayichthyiformes Lund 2000
    Family: Guildayichthyidae Lund 2000
    Genus: Discoserra
    Species: Discoserra pectinodon
    Author Citation LUND, 2000

    Geological Time Scale

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

    Stratigraphy

    Big Snowy Group
    Heath Formation

    Provenance

    Acquired by: Purchase/Trade

    Dimensions

    Length: 8 cm

    Location

    Bear Gulch
    Fergus County
    Montana
    United States

    Comments

    Taxonomy from Lund 2000.

    Diagnosis for the genus Discoserra from Lund 2000, p. 180: "Teeth of the premaxilla, maxilla and dentary long, thin, and styliform. Posterior end of maxilla does not extend back to level of anterior margin of orbit. Parietals excluded from contact in dorsal midline by postrostral 2, which contacts supraoccipital. No transverse supratemporal commissure in supraoccipital. Two rows of paired bones over orbit. One to three interopercular bones; two to three small postspiraculars and a presupracleithrum. Branchiostegals very variable in size, number and shape. Dorsal ridge scales with small, forwardly facing hooks; two to three small anal fin hooks. Origin of anterior edge of dorsal fin set well below dorsal margin of ridge scales. All fins with well spaced rays; pelvic fin reduced, caudal fin rounded."

    Line drawing from Lund 2000, p. 183:

    197950810_DiscoserrapectinodonHead.JPG.09ceed2f338c25e00ae559510e7747fb.JPG

    Identified by oilshale using Lund 2000.

    References:

    R. Lund (2000) The new Actinopterygian order Guildayichthyiformes from the Lower Carboniferous of Montana (USA). Geodiversitas 22(2):171-206

     

    DiscoserraKopf.JPG.575328005dfadc7703275f617dc52a46.jfif




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