NMITA:Neogene Marine Biota of Tropical America



Diaphus aff. brachycephalus (Taaning, 1928)



Specimen details:
 Sample Number: PPP2221
Type Status: nontype
Scale Bar is 1 mm
Type: SEM
Orientation: mesial
Locality: Bocas del Toro, Bocas del Toro, Panama

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Morphologic Description:

    Otolith shape: discoid;
    Dorsal margin sculpture: slightly irregular;
    Posterior margin: rounded and irregular;
    Ventral margin: rounded and serrate, with almost 10 denticles;
    Excisura: moderate, notch shallow, angle wide;
    Antirostrum: small and pointed;
    Rostrum: short, moderately broad and sharply pointed;
    Ventral depression: absent, shallow arch groove near ventral margin;
    Dorsal depression: shallow and oval;
    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;
    Sulcus acusticus: ostial, heterosulcoid;
    Dorsal margin: rounded and marginated posteriorly;
    Thickness: moderately thin;
    Form: -Mesial convex;
    Form: -Lateral flat;
Distribution:
    Early Pleistocene: Swann Cay Fm., Bocas del Toro, Panama;

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