Main
Key to Species
About
Contact
|
Morphological Attributes: Wallmaterial: hyaline Overall appearance: coiled spirally Coiling: trochospiral Chamberform: triangular to trapezoid Aperture Position: umbilical extraumbilical Aperture Form: slit, no tooth, no neck, no lip Sutures: --, --, -- Ornamentation: --, --, --, -- |
type specimen holotype Cretaceous Upper Cretaceous Mexico and Middle America unknown FEU-1008647 |  | type specimen holotype Cretaceous Upper Cretaceous Mexico and Middle America unknown FEU-1008648 |  |