NMITA:Neogene Marine Biota of Tropical America

Diaphus aff. problematicus (Parr, 1928)

Specimen details:
Sample Number: PPP1137
Type Status: nontype
Scale Bar is 1 mm
Type: SEM
Orientation: mesial
Locality: Darien, Darien, Panama

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Morphologic Description:

    Otolith shape: oval;
    Form: -Mesial slightly convex;
    Dorsal margin: approximately straight and raised anteriorly;
    Ventral margin: rounded and serrate, with almost 8 denticles;
    Sulcus acusticus: ostial, heterosulcoid;
    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 groove in mid-area;
    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;
    Posterior margin: blunt and narrow, emarginate dorsally and slightly irregular;
    Dorsal margin sculpture: irregular, with slightly notched in the postero-dorsal angle;
    Form: -Lateral convex;
    Thickness: moderately thin;
    Late Miocene: Tuira Fm., Darien, Panama;

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