NMITA:Neogene Marine Biota of Tropical America



Ctenosciaena aff. gracilicirrhus (Metzelaar, 1919)



Specimen details:
 Sample Number: PPP1732
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: approximately oval or rounded;
    Dorsal margin sculpture: entire;
    Posterior margin: slightly rounded to flat and entire;
    Ventral margin: well rounded and entire;
    Excisura: wide, notch absent;
    Antirostrum: very short and rounded;
    Rostrum: reduced;
    Ventral depression: absent;
    Dorsal depression: shallow and very narrow;
    Crista inferior: poorly developed under ostium, moderately well developed along the entire cauda;
    Crista superior: poorly developed over ostium, ridge-like over cauda;
    Collum: absent;
    Ostio-caudal differentiation: dorso-ventrally constricted;
    Cauda: long, narrow and deep, strongly bent in ventral direction;
    Ostium: sub-quadrangular;
    Pseudocolliculum: absent;
    Colliculum: heteromorph, low anterior and indistinct posterior colliculi;
    Sulcus acusticus: ostial, heterosulcoid;
    Dorsal margin: slightly rounded and entire;
    Thickness: moderately thick;
    Form: -Mesial convex;
    Form: -Lateral convex;
Distribution:
    Late Pliocene: Rio Banano Fm., Limon, Costa Rica;

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