NMITA:Neogene Marine Biota of Tropical America



Sciaenidarum sasaki (Schwarzhans, 1993)



Specimen details:
 Sample Number: PPP2667
Type Status: nontype
Scale Bar is 1 mm
Type: SEM
Orientation: mesial
Locality: Manzanilla Bay, Manzanilla Bay, Trinidad

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Specimen details:
 Sample Number: PPP2667
Type Status: nontype
Scale Bar is 1 mm
Type: SEM
Orientation: mesial
Locality: Manzanilla Bay, Manzanilla Bay, Trinidad

- Enlarge Image -

Morphologic Description:

    Otolith shape: oval;
    Thickness: thick;
    Form: -Mesial convex;
    Form: -Lateral slightly convex;
    Dorsal margin: slightly rounded;
    Dorsal margin sculpture: entire;
    Ventral margin: slightly rounded and entire;
    Posterior margin: sharply pointed;
    Sulcus acusticus: ostial, heterosulcoid;
    Colliculum: heteromorph, low anterior and indistinct posterior colliculi;
    Pseudocolliculum: absent;
    Ostium: extremely short and compressed, very high, more extended dorsally than ventrally, the posterior rim is nearly straight and vertical;
    Cauda: anteriorly narrow, moderately deep, slightly concave, turning upward meeting the posterior, downturned portion of the cauda in a right angle. The downturned portion of the cauda is oriented diagonally to the posterior ventral margin, close to the tip.;
    Ostio-caudal differentiation: dorso-ventrally constricted;
    Collum: absent;
    Crista superior: poorly developed over ostium, ridge-like over anterior portion of the cauda;
    Crista inferior: poorly developed under ostium, well developed under cauda;
    Dorsal depression: absent;
    Ventral depression: absent;
    Rostrum: reduced or absent;
    Antirostrum: absent;
    Excisura: absent;
Distribution:
    Middle Miocene: Manzanilla Fm., Manzanilla Bay, Trinidad;

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