NMITA:Neogene Marine Biota of Tropical America



Lampanyctus cupriarius (Taaning, )



Specimen details:
 Sample Number: PPP2553
Type Status: nontype
Scale Bar is 1 mm
Type: SEM
Orientation: mesial
Locality: Araya, Araya, Venezuela

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Morphologic Description:

    Otolith shape: approximately kidney-shaped and tall;
    Dorsal margin: rounded;
    Ventral margin: slightly rounded and entire;
    Sulcus acusticus: pseudo-ostiocaudal, may appear ostio-caudal, pseudo-archaesulcoid;
    Pseudocolliculum: poorly defined in the fossil specimen;
    Colliculum: heteromorph, larger anterior colliculum;
    Rostrum: eroded;
    Ventral depression: absent, ventral ridge present;
    Dorsal depression: oval, shallow, covering most of area;
    Crista inferior: poorly developed or absent along entire sulcus;
    Crista superior: well developed over ostium, poorly developed above cauda;
    Collum: absent;
    Ostio-caudal differentiation: slightly ventrally constricted;
    Cauda: short and oblong;
    Excisura: moderate, if present, notch very shallow and angle wide;
    Antirostrum: eroded;
    Ostium: approximately oblong with oblong colliculum;
    Posterior margin: rounded or slightly flattened and slightly emarginate, entire;
    Dorsal margin sculpture: entire;
    Form: -Lateral convex;
    Thickness: moderately thick;
    Form: -Mesial slightly concave;
Distribution:
    Early Pliocene: Cubagua Fm., Araya, Venezuela;

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