NMITA:Neogene Marine Biota of Tropical America



Umbrina coroides (Cuvier, 1830)



Specimen details:
 Sample Number: PPP04
Type Status: nontype
Scale Bar is 1 mm
Type: SEM
Orientation: mesial
Locality: Canal, Canal, Panama

- Enlarge Image -

Morphologic Description:

    Otolith shape: ovoid, becoming subcircular;
    Thickness: moderately thick;
    Form: -Mesial slightly convex;
    Form: -Lateral convex;
    Dorsal margin: rounded;
    Dorsal margin sculpture: slightly irregular;
    Ventral margin: rounded and slightly irregular;
    Posterior margin: slightly rounded;
    Sulcus acusticus: ostial, heterosulcoid;
    Colliculum: heteromorph, low anterior and indistinct posterior colliculi;
    Pseudocolliculum: absent;
    Ostium: large and subrectangular;
    Cauda: large and narrow, strongly bent in ventral direction, the tip curved in the anterior direction;
    Ostio-caudal differentiation: dorso-ventrally constricted;
    Collum: absent;
    Crista superior: poorly developed over ostium, ridge-like over horizontal portion of the cauda;
    Crista inferior: poorly developed under ostium, moderately well developed under sulcus;
    Dorsal depression: shallow and elongate;
    Ventral depression: absent;
    Rostrum: reduced;
    Antirostrum: short;
    Excisura: wide, notch absent;
Distribution:
    Middle Miocene to Late Miocene: Gatun Fm., Canal, Panama;

Return to: