NMITA:Neogene Marine Biota of Tropical America



Plagioscion aff. squamosissimus (Heckel, 1840)



Specimen details:
 Sample Number: OA-2
Type Status: nontype
Scale Bar is 1 mm
Type: light
Orientation: mesial
Locality: Paraguana, Paraguana, Venezuela

- Enlarge Image -

Morphologic Description:

    Otolith shape: sub-rectangular;
    Thickness: very thick;
    Form: -Mesial convex;
    Form: -Lateral convex, with nodules or tubercles;
    Dorsal margin: slightly straight;
    Dorsal margin sculpture: slightly irregular;
    Ventral margin: slightly rounded;
    Posterior margin: straight and oblique;
    Sulcus acusticus: ostial, heterosulcoid;
    Colliculum: heteromorph, low anterior and indistinct posterior colliculi;
    Pseudocolliculum: absent;
    Ostium: enlarged, inclined and sub-quadrangular;
    Ostio-caudal differentiation: dorso-ventrally constricted;
    Collum: absent;
    Crista superior: poorly developed over ostium, ridge-like over cauda;
    Crista inferior: poorly developed under ostium, moderately well developed under cauda;
    Dorsal depression: shallow and elongate;
    Ventral depression: absent;
    Rostrum: rudimentary or absent;
    Antirostrum: rounded;
    Excisura: very narrow, notch absent;
Distribution:
    Early Miocene: Cantaure Fm., Paraguana, Venezuela;

Return to: