Jump to content
  • Pteronisculus macropterus White, 1933


    Images:

    oilshale
    • In his 1933 paper, White described two new Pteroniscoids from Madagascar: Pteronisculus cicatrosus , which is rather common and the somewhat rarer Pteronisculus macropterus. According to White, P. macropterus is characterized by an "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 rugae only."

      Lit.:

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

    Taxonomy

    Kingdom: Animalia
    Phylum: Chordata
    Class: Actinopterygii
    Order: Palaeonisciformes
    Family: Palaeoniscidae
    Genus: Pteronisculus
    Species: P. macropterus
    Author Citation White, 1933

    Geological Time Scale

    Eon: Phanerozoic
    Era: Mesozoic
    Period: Triassic
    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

    Blank: 8cm

    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. According to White, P. macropterus is characterized by an "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 rugae only."

    Lit.:

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



    User Feedback


    oilshale

    Posted · Report

    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

    Share this comment


    Link to comment
    Share on other sites


    Create an account or sign in to comment

    You need to be a member in order to leave a comment

    Create an account

    Sign up for a new account in our community. It's easy!

    Register a new account

    Sign in

    Already have an account? Sign in here.

    Sign In Now


×