NMITA:Neogene Marine Biota of Tropical America



Oligopus sp.1



Specimen details:
 Sample Number: PPP2032
Type Status: nontype
Scale Bar is 1 mm
Type: SEM
Orientation: mesial
Locality: Limon, Limon, Costa Rica

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Morphologic Description:

    Otolith shape: oval and very elongate;
    Thickness: thick;
    Form: -Mesial slightly convex;
    Form: -Lateral convex;
    Dorsal margin: slightly flat;
    Dorsal margin sculpture: entire;
    Ventral margin: rounded and entire;
    Posterior margin: sharply rounded and entire;
    Sulcus acusticus: mesial, archaesulcoid;
    Colliculum: homomorph, single oval colliculum, slightly indented and elongated;
    Pseudocolliculum: absent;
    Ostium and Cauda: undifferentiated;
    Ostio-caudal differentiation: no constriction;
    Collum: absent;
    Crista superior: poorly developed over entire colliculum;
    Crista inferior: poorly developed under entire colliculum;
    Dorsal depression: shallow and oval;
    Ventral depression: absent;
    Rostrum: absent;
    Antirostrum: absent;
    Excisura: absent;
Distribution:
    Early Pleistocene to Middle Pleistocene: Moin Fm., Limon, Costa Rica;

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