NMITA:Neogene Marine Biota of Tropical America



Citharichthys 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: approximately discoid, becoming angular posteriorly;
    Thickness: moderately thick;
    Form: -Lateral approximately flat;
    Dorsal margin sculpture: entire;
    Posterior margin: sharply rounded to angular and entire;
    Colliculum: heteromorph, colliculum depressed;
    Ostium: narrow and oval;
    Pseudocolliculum: absent;
    Excisura: narrow, notch extremely shallow, angle wide;
    Antirostrum: absent;
    Rostrum: minute and sharply rounded;
    Ventral depression: joined forming horseshoes;
    Crista inferior: well developed under anterior ostium, broad, flat ridge elsewhere Dorsal depression and;
    Crista superior: well developed over anterior ostium, broad, rough-ridge along rest of sulcus; tip well developed or ridge-like;
    Collum: a slit passing through;
    Ostio-caudal differentiation: slightly dorso-ventrally constricted on internal walls of cristae;
    Cauda: oval, deeper than ostium;
    Sulcus acusticus: ostial, heterosulcoid;
    Ventral margin: slightly rounded to angular, entire;
    Dorsal margin: slightly rounded to angular;
    Form: -Mesial convex;
Distribution:
    Middle Miocene to Late Miocene: Gatun Fm., Canal, Panama;

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