NMITA:Neogene Marine Biota of Tropical America



Porichthys sp.2



Specimen details:
 Sample Number: PPP2539
Type Status: nontype
Scale Bar is 1 mm
Type: SEM
Orientation: mesial
Locality: Paraguana, Paraguana, Venezuela

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Morphologic Description:

    Otolith shape: oblong, with large antero-dorsal expansion;
    Thickness: slightly thick;
    Form: -Mesial slightly flat;
    Form: -Lateral convex;
    Dorsal margin: domed anteriorly;
    Dorsal margin sculpture: lobed and irregular;
    Ventral margin: slightly rounded and irregular;
    Posterior margin: sharply pointed and irregular;
    Sulcus acusticus: ostial, homosulcoid;
    Colliculum: homomorph, two colliculi almost equal in size;
    Pseudocolliculum: present, as long as, posterior colliculum;
    Ostium: oval;
    Cauda: oval, with oblong colliculum;
    Ostio-caudal differentiation: slight dorso-ventral constriction;
    Collum: absent;
    Crista superior: poorly developed over colliculum;
    Crista inferior: poorly developed under colliculum;
    Dorsal depression: oval;
    Ventral depression: absent;
    Rostrum: reduced;
    Antirostrum: absent;
    Excisura: poorly defined;
Distribution:
    Early Miocene: Cantaure Fm., Paraguana, Venezuela;

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