NMITA:Neogene Marine Biota of Tropical America



Equetus davidandrewi (Nolf & Aguilera, 1998)



Specimen details:
 Sample Number: PPP2541
Type Status: nontype
Scale Bar is 1 mm
Type: SEM
Orientation: mesial
Locality: Paraguana, Paraguana, Venezuela

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Morphologic Description:

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

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