Foraminifera taxon details
Rotalispirella acuta Consorti, Villalonga & Caus, 2017 †
1047745 (urn:lsid:marinespecies.org:taxname:1047745)
accepted
Species
marine, brackish, fresh, terrestrial
fossil only
Consorti, L., Villalonga, R., Caus, E. (2017). New Rotaliids (benthic foraminifera) from the Late Cretaceous of the Pyrenees in northeastern Spain. <em>The Journal of Foraminiferal Research.</em> 47: 284-293. [details]
Hayward, B.W.; Le Coze, F.; Vachard, D.; Gross, O. (2024). World Foraminifera Database. Rotalispirella acuta Consorti, Villalonga & Caus, 2017 †. Accessed at: https://marinespecies.org/foraminifera/aphia.php?p=taxdetails&id=1047745 on 2024-05-17
Date
action
by
original description
Consorti, L., Villalonga, R., Caus, E. (2017). New Rotaliids (benthic foraminifera) from the Late Cretaceous of the Pyrenees in northeastern Spain. <em>The Journal of Foraminiferal Research.</em> 47: 284-293. [details]
From editor or global species database
Original description Small-sized (nearly 1 mm in diameter), very low trochospiral perforated shell with flat, ornamented dorsal side. Lamellar thickening due to the formation of successive lamellae during ontogeny is evident especially in the first growth step. The periphery of the shell is angular and keeled, double-keeled in the first 1.5 whorls and subsequently single-keeled. When single-keeled, its position may fluctuate from central to ventral. Ventral side flat or slightly convex and largely occupied by folia and foliar piles. Folia are very long, superposed like the blades of a propeller. Foliar piles arise adaxially at the inner end of each folium. The shell is composed of 2–2.5 whorls; the double-keeled chambers are slightly rectangular while the others are trapezoidal in edge view.There are at least 7–8 chambers in the firstwhorl and approximately 10–12 in the second. Proloculus diameter varies from 53 micron to 80 micron. Septa are thick, 20 micron for those of the first whorl and 30 micron for those of the second. Shell diameter varies from 0.6–0.95 mm, while the height is ∼0.27–0.3 mm; the average D/H ratio is ∼2.6. Intraseptal interlocular spaces are present along the septa. Spiral interlocular spaces are thin. [details]
