NMITA:Neogene Marine Biota of Tropical America



Pomadasys aff. panamensis (Steindachner, 1875)



Specimen details:
 Sample Number: PPP2165
Type Status: nontype
Scale Bar is 1 mm
Type: SEM
Orientation: mesial
Locality: Canal, Canal, Panama

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Morphologic Description:

    Otolith shape: approximately rhomboidal, oblique anteriorly;
    Thickness: moderately thick;
    Form: -Mesial slightly convex;
    Form: -Lateral slightly concave anteriorly, convex posteriorly;
    Dorsal margin: raised, anglular and flattened;
    Dorsal margin sculpture: slightly irregular;
    Ventral margin: well rounded and slightly irregular;
    Posterior margin: oblique to rounded and slightly irregular;
    Sulcus acusticus: ostial, heterosulcoid;
    Colliculum: heteromorph, low anterior and indistinct posterior colliculi;
    Pseudocolliculum: absent;
    Ostium: oval, slightly angled dorsally;
    Cauda: narrow and straight, tip slightly flexed ventrally;
    Ostio-caudal differentiation: dorso-ventrally constricted;
    Collum: absent;
    Crista superior: moderately well developed over ostium, ridge-like above anterior cauda, absent at tip;
    Crista inferior: well developed under entire sulcus;
    Dorsal depression: oval and shallow from neck to flexion;
    Ventral depression: absent;
    Rostrum: moderate, broad and sharply rounded;
    Antirostrum: minute and rounded;
    Excisura: moderately wide, notch very shallow, angle wide;
Distribution:
    Late Miocene: Gatun Fm., Canal, Panama;

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