NMITA:Neogene Marine Biota of Tropical America



Anchoa sp.3



Specimen details:
 Sample Number: PPP2671
Type Status: nontype
Scale Bar is 1 mm
Type: SEM
Orientation: mesial
Locality: Manzanilla Bay, Manzanilla Bay, Trinidad

- Enlarge Image -

Morphologic Description:

    Otolith shape: oval;
    Thickness: moderately thin;
    Form: -Mesial slightly convex;
    Form: -Lateral slightly convex;
    Dorsal margin: rounded;
    Dorsal margin sculpture: slightly irregular;
    Ventral margin: rounded and slightly irregular, with few denticles;
    Posterior margin: sharply rounded and slightly irregular;
    Sulcus acusticus: ostial, heterosulcoid;
    Colliculum: homomorph;
    Pseudocolliculum: absent;
    Ostium: oval and large;
    Cauda: short, oval, poorly defined posteriorly;
    Ostio-caudal differentiation: dorso-ventrally constricted;
    Collum: absent;
    Crista superior: well developed ridge-like over sulcus, except in the cauda tip;
    Crista inferior: well developed ridge-like under sulcus, except in the cauda tip;
    Dorsal depression: very shallow;
    Ventral depression: small and shallow below ridge;
    Rostrum: large and rounded;
    Antirostrum: short and rounded;
    Excisura: wide, notch shallow, angles acute;
Distribution:
    Middle Miocene: Manzanilla Fm., Manzanilla Bay, Trinidad;

Return to: