NMITA:Neogene Marine Biota of Tropical America



Opistognathus sp.1



Specimen details:
 Sample Number: PPP2549
Type Status: nontype
Scale Bar is 1 mm
Type: SEM
Orientation: mesial
Locality: Araya, Araya, Venezuela

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Morphologic Description:

    Otolith shape: oblong;
    Thickness: moderate;
    Form: -Mesial convex;
    Form: -Lateral approximately flat;
    Dorsal margin: slightly rounded to flat;
    Dorsal margin sculpture: irregular or crenate;
    Ventral margin: slightly rounded or flattened, crenulate or irregular;
    Posterior margin: rounded, may be notched and irregular;
    Sulcus acusticus: ostial, heterosulcoid;
    Colliculum: heteromorph, anterior colliculum slightly raised, posterior indistinct;
    Pseudocolliculum: absent;
    Ostium: flared dorsally, moderately deep, anterior dorsal well poorly defined;
    Cauda: flexed upward and curved along its length;
    Ostio-caudal differentiation: dorso-ventrally constricted;
    Collum: absent;
    Crista superior: ridge-like from mid-ostium to midcauda, very poor developed over ostium, well developed over posterior cauda;
    Crista inferior: low ridge below ostium, well developed below cauda;
    Dorsal depression: oval;
    Ventral depression: elongate depression under cauda and near the margin;
    Rostrum: moderate, broad and pointed;
    Antirostrum: small and sharply rounded;
    Excisura: moderate, angle wide;
Distribution:
    Early Pliocene: Cubagua Fm., Araya, Venezuela;

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