NMITA:Neogene Marine Biota of Tropical America



Prionotus sp.1



Specimen details:
 Sample Number: PPP1137
Type Status: nontype
Scale Bar is 1 mm
Type: SEM
Orientation: mesial
Locality: Darien, Darien, Panama

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Morphologic Description:

    Otolith shape: bluntly ovate;
    Thickness: moderately thick;
    Form: -Mesial slightly convex;
    Form: -Lateral slightly concave;
    Dorsal margin: rounded;
    Dorsal margin sculpture: crenulate;
    Ventral margin: rounded and crenate;
    Posterior margin: oblique or rounded and slightly crenulate;
    Sulcus acusticus: ostial, heterosulcoid;
    Colliculum: heteromorph, indistinct and depressed colliculi;
    Pseudocolliculum: absent;
    Ostium: small, extending onto rostrum;
    Cauda: large and narrow, gently flexed ventrally;
    Ostio-caudal differentiation: dorso-ventrally constricted;
    Collum: slightly raised and rounded;
    Crista superior: ridge-like along sulcus, poor at tip;
    Crista inferior: well developed in neck, very poor at extremes;
    Dorsal depression: deep and oval;
    Ventral depression: absent;
    Rostrum: large and sharply rounded;
    Antirostrum: large and sharply rounded;
    Excisura: moderate, notch deep, angle acute;
Distribution:
    Late Miocene: Tuira Fm., Darien, Panama;

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