NMITA:Neogene Marine Biota of Tropical America



Apogon sp.2



Specimen details:
 Sample Number: PPP1727
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, becoming angular posteriorly;
    Thickness: moderate;
    Form: -Mesial slightly convex;
    Form: -Lateral convex;
    Dorsal margin: slightly flat;
    Dorsal margin sculpture: lobed to irregular;
    Ventral margin: rounded and slightly irregular;
    Posterior margin: sharply rounded to oblique and irregular;
    Sulcus acusticus: ostial, heterosulcoid;
    Colliculum: heteromorph, anterior colliculum large, approximately oval, posterior narrow, raised towards ventral edge;
    Pseudocolliculum: absent;
    Ostium: large, approximately oval;
    Cauda: short, straight, slightly angles dorsally;
    Ostio-caudal differentiation: dorso-ventrally constricted;
    Collum: absent;
    Crista superior: poorly developed at extremes;
    Crista inferior: poorly developed;
    Dorsal depression: deep and oval;
    Ventral depression: absent;
    Rostrum: sharply rounded;
    Antirostrum: short and blunt;
    Excisura: moderate, notch shallow, angle wide;
Distribution:
    Late Pliocene: Rio Banano Fm., Limon, Costa Rica;

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