NMITA:Neogene Marine Biota of Tropical America



Syacium sp.1



Specimen details:
 Sample Number: PPP2245
Type Status: nontype
Scale Bar is 1 mm
Type: SEM
Orientation: mesial
Locality: Bocas del Toro, Bocas del Toro, Panama

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Morphologic Description:

    Otolith shape: approximately rhomboidal;
    Thickness: moderately thick;
    Form: -Mesial convex;
    Form: -Lateral approximately flat too slightly convex;
    Dorsal margin: slightly rounded to straight and angular;
    Dorsal margin sculpture: entire;
    Ventral margin: slightly rounded and entire;
    Posterior margin: sharply oblique, straight and entire;
    Sulcus acusticus: ostial, heterosulcoid;
    Colliculum: heteromorph, colliculum depressed;
    Pseudocolliculum: absent;
    Ostium: narrow and oval;
    Cauda: smaller, oval and deep;
    Ostio-caudal differentiation: slightly dorso-ventrally constricted on internal walls of cristae;
    Collum: a slit passing through;
    Crista superior: well developed over anterior ostium, broad, rough-ridge along rest of sulcus; tip well developed or ridge-like;
    Crista inferior: well developed under anterior ostium, broad, flat ridge elsewhere;
    Dorsal depression: oval, elongated, covering most of the dorsal area;
    Ventral depression: narrow and elongated;
    Rostrum: minute and sharply rounded;
    Antirostrum: absent;
    Excisura: narrow, notch extremely shallow, angle wide;
Distribution:
    Early Pliocene: Cayo Agua Fm., Bocas del Toro, Panama;

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