NMITA:Neogene Marine Biota of Tropical America




Sciaenidarum sp.2 (n.sp) (Schwarzhans, 1993)




Specimen details:
Sample Number: PPP2673
Type Status: type
Scale Bar is 1 mm
Type: SEM
Orientation: mesial
Locality: Manzanilla Bay, Manzanilla Bay, Trinidad

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Specimen details:
Sample Number: PPP2673
Type Status: type
Scale Bar is 1 mm
Type: SEM
Orientation: mesial
Locality: Manzanilla Bay, Manzanilla Bay, Trinidad

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Morphologic Description:

    Otolith shape: oval;
    Thickness: thick;
    Form: -Mesial slightly convex;
    Form: -Lateral convex;
    Dorsal margin: rounded;
    Dorsal margin sculpture: slightly irregular;
    Ventral margin: slightly flat;
    Posterior margin: sharply rounded;
    Sulcus acusticus: ostial, heterosulcoid;
    Colliculum: heteromorph, low anterior and indistinct posterior colliculi;
    Pseudocolliculum: absent;
    Ostium: expanded only dorsally and does not reach the anterior margin;
    Cauda: shows a strong sinuosity in the anterior portion (convex following by concave section), turning upwards meeting the posterior, down-turned portion of the cauda in a right angle;
    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;
    Antirostrum: reduced;
    Excisura: very narrow;
Distribution:
    Middle Miocene: Manzanilla Fm., Manzanilla Bay, Trinidad;


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