NMITA:Neogene Marine Biota of Tropical America



Ariosoma balearicum (DeLaroche, 1980)



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: circular;
    Thickness: moderately thin;
    Form: -Mesial slightly convex;
    Form: -Lateral very slightly convex;
    Dorsal margin: rounded, with a central expansion;
    Dorsal margin sculpture: slightly irregular;
    Ventral margin: rounded and slightly irregular;
    Posterior margin: rounded and slightly irregular;
    Sulcus acusticus: Para-ostial, archaesulcoid;
    Colliculum: homomorph, single low colliculum;
    Pseudocolliculum: absent;
    Ostium and Cauda: undifferentiated, approximately oval and shallow, with a slightly central constriction;
    Ostio-caudal differentiation: no constriction;
    Collum: absent;
    Crista superior: moderately well developed;
    Crista inferior: moderately well developed;
    Dorsal depression: absent;
    Ventral depression: absent;
    Rostrum: large, broad and rounded;
    Antirostrum: absent;
    Excisura: very narrow, notch absent;
Distribution:
    Early Pleistocene: Swann Cay Fm., Bocas del Toro, Panama;

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