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  • Pteronisculus macropterus White, 1933


    Images:

    oilshale

    Taxonomy

    Kingdom: Animalia
    Phylum: Chordata
    Class: Actinopteri Cope 1871
    Order: Palaeonisciformes Hay 1902
    Family: Palaeoniscidae Vogt 1852
    Genus: Pteronisculus
    Species: Pteronisculus macropterus
    Author Citation White, 1933

    Geological Time Scale

    Eon: Phanerozoic
    Era: Mesozoic
    Period: Triassic
    Sub Period: None
    Epoch: Early
    International Age: Dienerian

    Stratigraphy

    Beaufort Group
    Sakamena Formation

    Biostratigraphy

    Lystrosaurus and Cynognathus Zone
    Fish and Ammonite Horizon

    Provenance

    Acquired by: Purchase/Trade

    Dimensions

    Length: 8 cm

    Location

    Ambodipo
    Antsiranana Province
    Diana Region
    Madagascar

    Comments

    In his 1933 paper, White described two new Pteroniscoids from Madagascar: Pteronisculus cicatrosus , which is rather common and the somewhat rarer Pteronisculus macropterus.

    Diagnosis from White 1933, p. 126: "Pteronisculus with elongate-fusiform body; maximum depth rather less than length of head with opercular apparatus, and equal to one—quarter total length to base of caudal fin. Length of pectoral fin exceeding distance between tip of snout and hinder margin of maxilla. Origin of dorsal fin above fortieth scale—row from pectoral girdle approximately. Scales in more than seventy vertical rows to base of caudal fin, and ornamented with oblique rugæ only."

    Sketch from White 1933, p. 126:

    image.png.abb72d98e464150ea78cdb1e060105cd.png

    References:

    White, E. I. (1933): New Triassic palaeoniscids from Madagascar. Ann. a. Mag. Nat. Hist.(10) 11: 118-128; London




    User Feedback


    Hey @oilshale, i cant tell whats going on with this fish?  Is the tail of the fish on the middle of the fish?

     

    Ron

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    Hi Ron,

    the tail is missing and the fish is seen in partial ventral view - so belly up. These huge fins are the pectoral fins - they can almost touch the anal fin.

    In P. cicatrosus, the pectoral fins are much smaller.

    Thomas

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    Can't ever refuse a decent amblypterid.

    Nice one,Tom

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    Very nice piece, even if the tail fin is missing

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