NMITA:Neogene Marine Biota of Tropical America

Sciaena trewavasae (Chao & Miller, 1975)

Specimen details:
Sample Number: PPP2545
Type Status: nontype
Scale Bar is 1 mm
Type: SEM
Orientation: mesial
Locality: Paraguana, Paraguana, Venezuela

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Morphologic Description:

    Otolith shape: subcircular;
    Thickness: very thick;
    Form: -Mesial convex;
    Form: -Lateral convex, with central nodules;
    Dorsal margin: slightly straight;
    Dorsal margin sculpture: slightly entire;
    Ventral margin: rounded;
    Posterior margin: rounded to angular and entire;
    Sulcus acusticus: ostial, heterosulcoid;
    Colliculum: heteromorph, low anterior and indistinct posterior colliculi;
    Pseudocolliculum: absent;
    Ostium: enlarged, straight and sub-circular;
    Cauda: short and narrow; tip gently flexed, ventrally ending very close to the posterior margin and rounded;
    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: reduced;
    Antirostrum: rounded;
    Excisura: narrow, notch absent;
    Early Miocene: Cantaure Fm., Paraguana, Venezuela;

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