NMITA:Neogene Marine Biota of Tropical America



Menticirrhus aff. chaoi (Nolf & Stringer, 1992)



Specimen details:
 Sample Number: PPP1142
Type Status: nontype
Scale Bar is 1 mm
Type: SEM
Orientation: mesial
Locality: Darien, Darien, Panama

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Morphologic Description:

    Otolith shape: elongate rectangular;
    Form: -Mesial convex;
    Form: -Lateral slightly convex;
    Dorsal margin sculpture: slightly irregular;
    Posterior margin: slightly straight and inclined;
    Colliculum: heteromorph, low anterior and indistinct posterior colliculi;
    Ostium: elongate, ovoid to rectangular, slightly inclined ventrally;
    Ostio-caudal differentiation: dorso-ventrally constricted;
    Cauda: long and narrow, strongly bent; the tip is somewhat curved in the anterior direction close to ventral margin.;
    Excisura: narrow, notch absent;
    Antirostrum: reduced;
    Rostrum: reduced;
    Ventral depression: absent;
    Dorsal depression: shallow and elongate;
    Crista inferior: poorly developed under ostium, moderately well developed under cauda;
    Crista superior: poorly developed over ostium, ridge-like over cauda;
    Collum: absent;
    Pseudocolliculum: absent;
    Sulcus acusticus: ostial, heterosulcoid;
    Ventral margin: slightly straight and slightly irregular;
    Dorsal margin: slightly straight;
    Thickness: slightly thick;
Distribution:
    Late Miocene: Tuira Fm., Darien, Panama;

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