Orbulina

Or`bu`li´na


prop. n.1.(Zool.) A genus of minute living Foraminifera having a globular shell.
References in periodicals archive ?
Denyer y Arias (1991) detallan la presencia de Praeorbulina glomerosa, Orbulina cf.
Morphological recognition of cryptic species in the planktonic foraminifera Orbulina universa.
Orbulina universa, Globigerinella siphonifera, Globigerina bulloides, Globigerinita glutinata, and Pulleniatina obliquiloculata do not show a strong preference for particular depths within 300 m of water column (Be & Tolderlund 1971).
Experimental determination of barium uptake in shells of the planktonic Foraminifera Orbulina universa at 22[degrees]C.
We have successfully analysed 5 - 10 mg samples of planktonic foraminiferal tests (Pulleniatina obliquiloculata, Globorotalia tumida and Orbulina universa) from top 2 cm of cores collected from Ontong-Java Plateau (western Pacific) and Ceara Rise (western equatorial Atlantic).
Evidence of the Orbulina Marl formation was first seen at approximately 5,250 feet (1,600 meters) with Calcium Carbonate (CaCO3) increasing from approximately 20% up to 60%.
La primera corresponde al Mioceno Temprano y la segunda al Mioceno Medio por la presencia de la Orbulina universa (Bolli et al, 1985), por lo que el rio Calvario representaria el contacto entre el Mioceno Temprano y el Mioceno Medio.
Other vertebrate and invertebrate fossils from San Gerardo de Limoncito have a longer chronological range (Oligocene to Pliocene), and the microforaminiferan Orbulina universa (Laurito & Valerio, 2008a, b) is present and has a temporal range from Middle Miocene to Holocene.
The identified species which have a wide stratigraphic range are: Globigerinoides quadrilobatus trilobus and Orbulina universa (D.