Top close view of a specimen of Orbitolina (Mesorbitolina) texana with the typical rings hardly visible
Test shape depressed conical, with a convex upper and concave lower side
The classification is based upon: Loeblich and Tappan, Treatise on Invertebrate Paleontology, Part C, C310 and Cushman,J.A.: Foraminifera, Their Classification and Economic Use, 4ed. 1959, Page 210/211 + Plate 19 and HUSINEC A, Mid Cretaceous orbitolinid (Foraminiferida) record from the islands of Cres and Losinj (Croatia) and its regional stratigraphic correlation. Cretaceous Research vol: 21 issue: 1 page: 155-171 year: 2000