NMITA:Neogene Marine Biota of Tropical America



Melamphaes polylepis (Ebeling, )



Specimen details:
 Sample Number: PPP3055
Type Status: nontype
Scale Bar is 1 mm
Type: SEM
Orientation: mesial
Locality: Araya, Araya, Venezuela

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Morphologic Description:

    Otolith shape: oval, becoming diagonal anteriorly;
    Posterior margin: rounded and irregular;
    Ventral margin: slightly rounded, irregular, with a pit in each extreme;
    Crista inferior: poorly developed at extremes;
    Crista superior: poorly developed at extremes;
    Collum: absent;
    Ostio-caudal differentiation: dorso-ventrally constricted;
    Cauda: short and oblong;
    Ostium: approximately oval;
    Pseudocolliculum: absent;
    Colliculum: heteromorph, anterior colliculum large and oval, posterior colliculum narrow, raised towards ventral edge;
    Excisura: poorly defined or absent;
    Antirostrum: poorly defined or absent;
    Rostrum: poorly defined or absent;
    Ventral depression: very shallow, narrow and elongate;
    Dorsal depression: shallow and elongate;
    Sulcus acusticus: ostial, heterosulcoid;
    Thickness: thin;
    Form: -Lateral convex;
    Dorsal margin: rounded, diagonal anteriorly;
    Dorsal margin sculpture: entire to slightly irregular;
    Form: -Mesial flattened;
Distribution:
    Early Pliocene: Cubagua Fm., Araya, Venezuela;

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