NMITA:Neogene Marine Biota of Tropical America

Diaphus aff. regani (Taaning, 1932)

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

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Morphologic Description:

    Otolith shape: oval;
    Dorsal margin sculpture: irregular;
    Posterior margin: rounded and irregular;
    Ventral margin: rounded and serrate, with almost 8 denticles;
    Crista inferior: poorly developed along entire sulcus;
    Crista superior: low ridge from ostium to mid-cauda, poorly developed or absent at caudal tip;
    Collum: absent;
    Ostio-caudal differentiation: ventrally constricted;
    Cauda: oval, poorly defined posteriorly;
    Ostium: elongate, oval slightly flare, dorsal margin of sulcus is sinuous;
    Pseudocolliculum: present, elongate but low, under entire posterior colliculum;
    Colliculum: heteromorph, with low oblong anterior and oval posterior colliculum;
    Excisura: moderate, notch shallow, angle wide;
    Antirostrum: small and pointed;
    Rostrum: short, moderately broad and sharply rounded;
    Ventral depression: absent, shallow arch groove in mid-area;
    Dorsal depression: shallow;
    Sulcus acusticus: ostial, heterosulcoid;
    Dorsal margin: approximately straight, angled to rostrum, emarginated posteriorly;
    Thickness: moderately thin;
    Form: -Mesial slightly convex;
    Form: -Lateral convex;
    Early Miocene: Cantaure Fm., Paraguana, Venezuela;

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