NMITA:Neogene Marine Biota of Tropical America



Parasudis sp.1



Specimen details:
 Sample Number: PPP1137
Type Status: nontype
Scale Bar is 1 mm
Type: SEM
Orientation: mesial
Locality: Darien, Darien, Panama

- Enlarge Image -

Morphologic Description:

    Otolith shape: ovate;
    Thickness: medium thin;
    Form: -Mesial slightly convex;
    Form: -Lateral flat;
    Dorsal margin: slightly rounded to straight, anterior and posterior corners rounded;
    Dorsal margin sculpture: slightly lobed;
    Ventral margin: rounded and lobed;
    Posterior margin: corners rounded and irregular;
    Sulcus acusticus: ostial, heterosulcoid;
    Colliculum: no raised colliculi;
    Pseudocolliculum: absent;
    Ostium: small flared anteriorly and lies along the length of the rostrum;
    Cauda: straight and horizontal, has a deep anterior pit, poorly defined posteriorly;
    Ostio-caudal differentiation: ostium generally narrower than cauda, slight ventral constriction;
    Collum: low wall-like structure between the ostium and cauda;
    Crista superior: straight and ridge-like, absent at tip;
    Crista inferior: straight and ridge-like under the mid cauda only;
    Dorsal depression: shallow depression covering most of dorsal area;
    Ventral depression: absent but raised plateau under crista;
    Rostrum: large and rounded;
    Antirostrum: minute, but dorsal wall rises vertically behind excisura;
    Excisura: wide, notch absent or very shallow;
Distribution:
    Late Miocene: Tuira Fm., Darien, Panama;

Return to: