NMITA:Neogene Marine Biota of Tropical America



Symphurus sp.1



Specimen details:
 Sample Number: PPP2553
Type Status: nontype
Scale Bar is 1 mm
Type: SEM
Orientation: mesial
Locality: Araya, Araya, Venezuela

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Morphologic Description:

    Otolith shape: rounded-triangular;
    Thickness: moderately thick;
    Form: -Mesial convex;
    Form: -Lateral convex;
    Dorsal margin: flat or slightly rounded;
    Dorsal margin sculpture: slightly irregular;
    Ventral margin: rounded and slightly irregular;
    Posterior margin: flat or slightly irregular,may be emarginate;
    Sulcus acusticus: pseudo-ostial or ostial, heterosulcoid;
    Colliculum: homomorph, single raised, fused colliculum, may be depressed in center, angularity funnel shaped;
    Pseudocolliculum: absent;
    Ostium: straight and narrow poorly defined at tip and may penetrate anterior well;
    Cauda: triangular and blunt;
    Ostio-caudal differentiation: dorso-ventrally constricted;
    Collum: absent;
    Crista superior: poorly developed along entire sulcus;
    Crista inferior: poorly developed along entire sulcus;
    Dorsal depression: dorsal area raised with groove-like depression around it;
    Ventral depression: ventral area and posterior area raised with grooves around them;
    Rostrum: absent;
    Antirostrum: absent;
    Excisura: absent;
Distribution:
    Early Pliocene: Cubagua Fm., Araya, Venezuela;

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