NMITA:Neogene Marine Biota of Tropical America



Ophichthus sp.1



Specimen details:
 Sample Number: PPP2167
Type Status: nontype
Scale Bar is 1 mm
Type: SEM
Orientation: mesial
Locality: Canal, Canal, Panama

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Morphologic Description:

    Otolith shape: oval;
    Thickness: thin;
    Form: -Mesial slightly convex;
    Form: -Lateral slightly convex;
    Dorsal margin: slightly rounded;
    Dorsal margin sculpture: slightly irregular;
    Ventral margin: slightly rounded and irregular;
    Posterior margin: sharply rounded and irregular;
    Sulcus acusticus: pseudo-ostial, heterosulcoid;
    Colliculum: homomorph, poorly defined colliculum in ostium and cauda;
    Pseudocolliculum: absent;
    Ostium: oval;
    Cauda: elongate;
    Ostio-caudal differentiation: dorso-ventrally constricted;
    Collum: absent;
    Crista superior: poorly developed over ostium, moderately well developed over cauda;
    Crista inferior: poorly developed under ostium, moderately well developed under cauda;
    Dorsal depression: absent;
    Ventral depression: absent;
    Rostrum: small and rounded;
    Antirostrum: small and rounded;
    Excisura: narrow and shallow, angle acute;
Distribution:
    Middle Miocene to Late Miocene: Gatun Fm., Canal, Panama;

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