NMITA:Neogene Marine Biota of Tropical America

Micropogonias sp.1 (n.sp)

Specimen details:
Sample Number: PPP2534
Type Status: type
Scale Bar is 1 mm
Type: SEM
Orientation: mesial
Locality: Carrizal, Carrizal, Venezuela

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Morphologic Description:

    Otolith shape: subcircular;
    Excisura: very narrow, notch absent;
    Antirostrum: reduced;
    Rostrum: reduced;
    Ventral depression: absent;
    Dorsal depression: absent;
    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;
    Cauda: long and narrow, strongly bent in ventral direction. The tip curves in the anterior direction with an expanded distal end.;
    Ostium: enlarged and circular;
    Pseudocolliculum: absent;
    Colliculum: heteromorph, low anterior and indistinct posterior colliculi;
    Sulcus acusticus: ostial, heterosulcoid;
    Posterior margin: rounded and entire;
    Form: -Mesial convex;
    Form: -Lateral convex;
    Dorsal margin: rounded;
    Ventral margin: rounded and slightly irregular;
    Dorsal margin sculpture: entire;
    Thickness: very thick;
    Late Miocene: Caujarao Fm., Carrizal, Venezuela;

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