NMITA:Neogene Marine Biota of Tropical America



Bregmaceros sp.1



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: irregular hexagon, face-like;
    Thickness: thin;
    Form: -Mesial flat;
    Form: -Lateral slightly convex to flat;
    Dorsal margin: domed;
    Dorsal margin sculpture: irregular;
    Ventral margin: slightly rounded to flat and slightly irregular;
    Posterior margin: sinuate and entire;
    Sulcus acusticus: mesial, homosulcoid;
    Colliculum: homomorph, two-indented colliculi;
    Pseudocolliculum: present, nose-like, almost connecting ostium and cauda;
    Ostium: rounded to short oval depression;
    Cauda: more elongate, oval depression;
    Ostio-caudal differentiation: separated by the collum;
    Collum: present, flat, and slightly higher than ostium and cauda;
    Crista superior: very poorly developed;
    Crista inferior: poorly developed, slightly raised towards cauda;
    Dorsal depression: half oval and shallow towards dorsal margin, bounded by low ventral ridge;
    Ventral depression: absent, with a low ventral ridge;
    Rostrum: absent;
    Antirostrum: absent;
    Excisura: absent;
Distribution:
    Early Pleistocene: Swann Cay Fm., Bocas del Toro, Panama;

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