NMITA:Neogene Marine Biota of Tropical America



Equetus aff. punctatus (Bloch & Schneider, 1801)



Specimen details:
 Sample Number: PPP2539
Type Status: nontype
Scale Bar is 1 mm
Type: SEM
Orientation: mesial
Locality: Paraguana, Paraguana, Venezuela

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Morphologic Description:

    Otolith shape: oblong becoming subrectangular;
    Dorsal margin sculpture: slightly irregular;
    Posterior margin: straight and slightly irregular;
    Ventral margin: slightly rounded and irregular;
    Ostium: moderate and subrectangular;
    Pseudocolliculum: absent;
    Colliculum: heteromorph, low anterior and indistinct posterior colliculi;
    Sulcus acusticus: ostial, heterosulcoid;
    Dorsal margin: slightly rounded and slightly expanded anteriorly;
    Thickness: moderately thick;
    Form: -Mesial slightly convex;
    Form: -Lateral convex;
    Cauda: moderately short and narrow, strongly bent in right angle ventrally. The area situated between the posterior part of the ostial crista inferior and the recurved portion of the cauda is lesser than the maximal diameter of the ostium.;
    Ostio-caudal differentiation: dorso-ventrally constricted;
    Collum: absent;
    Crista inferior: poorly developed under ostium, moderately well developed along sulcus;
    Ventral depression: absent;
    Antirostrum: rounded;
    Excisura: very narrow, notch absent;
    Rostrum: reduced;
    Dorsal depression: shallow and elongate;
    Crista superior: poorly developed over ostium, ridge-like over horizontal portion of the cauda;
Distribution:
    Early Miocene: Cantaure Fm., Paraguana, Venezuela;

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