No abstract

Sellialveolina Colalongo, 1963 is the most primitive rhapydioninid genus known, and it is the only genus of axially compressed alveolinaceans (Rhapydioninidae) present in the Middle Cretaceous Global Community Maturation cycle. Sellialveolina colonized the Tethyan carbonate platforms from the Middle East to the Iberian Peninsula.This work is based on a detailed analysis of the internal structure of Sellialveolina which enabled clarification of its morphostructural features and the phylogenetical and stratigraphical relationships between its species. The basic structure of Sellialveolina consists of a subdivision of the chamber lumen into numerous chamberlets by septula and floors. The chamberlets, placed in the center of the chamber, exhibit a tendency to develop a crosswise-oblique structure.

No abstract

No abstract

No abstract