NMITA:Neogene Marine Biota of Tropical America

cf. Diplectrum sp.1

Specimen details:
Sample Number: PPP2225
Type Status: nontype
Scale Bar is 1 mm
Type: SEM
Orientation: mesial
Locality: Bocas del Toro, Bocas del Toro, Panama

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Morphologic Description:

    Otolith shape: oval;
    Thickness: moderately thick;
    Form: -Mesial slightly convex;
    Form: -Lateral convex;
    Dorsal margin: slightly rounded;
    Dorsal margin sculpture: slightly irregular;
    Ventral margin: slightly rounded and irregular;
    Posterior margin: strongly angular and irregular;
    Sulcus acusticus: ostial, heterosulcoid;
    Colliculum: heteromorph, low anterior and posterior colliculi;
    Pseudocolliculum: absent;
    Ostium: approximately oval, slight dorsal flare;
    Cauda: straight, with slight posterior flexion, tip poorly defined;
    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 along the entire cauda;
    Dorsal depression: deep and elongate;
    Ventral depression: elongate and narrow arch depression close to the ventral margin;
    Rostrum: large and pointed;
    Antirostrum: short and rounded;
    Excisura: moderately wide, notch absent;
    Early Pliocene: Cayo Agua Fm., Bocas del Toro, Panama;

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