NMITA:Neogene Marine Biota of Tropical America

Stellifer aff. rastrifer (Jordan, 1889)

Specimen details:
Sample Number: PPP1727
Type Status: nontype
Scale Bar is 1 mm
Type: SEM
Orientation: mesial
Locality: Limon, Limon, Costa Rica

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Morphologic Description:

    Otolith shape: approximately rectangular;
    Thickness: thick;
    Form: -Mesial slightly convex;
    Form: -Lateral convex;
    Dorsal margin: flattened;
    Dorsal margin sculpture: pre-dorsal spine acute;
    Ventral margin: slightly flat;
    Posterior margin: short obtuse angle, emarginated ventrally;
    Sulcus acusticus: ostial, heterosulcoid;
    Colliculum: heteromorph, low anterior and indistinct posterior colliculi;
    Pseudocolliculum: absent;
    Ostium: small, discoid, in anteroventral position;
    Cauda: deep and wide, strongly flexed, ending close to ventral margin;
    Ostio-caudal differentiation: dorso-ventrally constricted;
    Collum: absent;
    Crista superior: poorly developed over ostium, ridge-like over anterior portion of the cauda;
    Crista inferior: poorly developed under ostium, well developed under cauda;
    Dorsal depression: very narrow and elongate;
    Ventral depression: absent;
    Rostrum: reduced;
    Antirostrum: sharply pointed;
    Excisura: moderately wide, notch absent;
    Late Pliocene: Rio Banano Fm., Limon, Costa Rica;

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