NMITA:Neogene Marine Biota of Tropical America



Polymixia sp.1



Specimen details:
 Sample Number: PPP2541
Type Status: nontype
Scale Bar is 1 mm
Type: SEM
Orientation: mesial
Locality: Paraguana, Paraguana, Venezuela

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Morphologic Description:

    Otolith shape: approximately rhomboidal;
    Thickness: moderately thin;
    Form: -Mesial slightly convex;
    Form: -Lateral slightly concave;
    Dorsal margin: slightly raised and angular;
    Dorsal margin sculpture: lobed or irregular;
    Ventral margin: rounded, lobed or irregular;
    Posterior margin: blunt and irregular;
    Sulcus acusticus: ostial, heterosulcoid;
    Colliculum: homomorph, single low anterior colicullum;
    Pseudocolliculum: absent;
    Ostium: ventral wall with slight deep in center, flared anteriorly, filled with colliculum;
    Cauda: narrow with ventral flexion near tip;
    Ostio-caudal differentiation: dorso-ventrally constricted;
    Collum: absent;
    Crista superior: ridge-like above neck, well developed elsewhere;
    Crista inferior: well developed along entire length;
    Dorsal depression: shallow;
    Ventral depression: absent;
    Rostrum: short, broad and blunt;
    Antirostrum: small and sharply pointed;
    Excisura: moderate, notch shallow;
Distribution:
    Early Miocene: Cantaure Fm., Paraguana, Venezuela;

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