Foraminifera taxon details
Opertum Voloshina, 1972 †
739140 (urn:lsid:marinespecies.org:taxname:739140)
accepted
Genus
Ataxophragmium (Opertum) incognitum Voloshina, 1972 † accepted as Opertum incognitum (Voloshina, 1972) † (type by original designation)
Ataxophragmium (Opertum) Voloshina, 1972 † · unaccepted (Opinion of Loeblich &Tappan...)
Opinion of Loeblich &Tappan (1987) nomen translatum
marine, brackish, fresh, terrestrial
fossil only
neuter
Diagnosis Test subglobular, with few gradually enlarging chambers in a low trochospiral coil that is nearly involute on the spiral...
Diagnosis Test subglobular, with few gradually enlarging chambers in a low trochospiral coil that is nearly involute on the spiral side, chamber interior subdivided by numerous tiers of internal partial partitions or buttresses that form distinct chamberlets and may be more numerous in later chambers; wall moderately coarsely agglutinated, surface roughened; aperture a low interiomarginal slit on the periphery and may be slightly oblique. U. Cretaceous (U. Campanian to Maastrichtian); USSR: Ukraine, Crimea, W. Siberian depression. (Loeblich & Tappan, 1987, Foraminiferal Genera and Their Classification) [details]
Hayward, B.W.; Le Coze, F.; Vachard, D.; Gross, O. (2025). World Foraminifera Database. Opertum Voloshina, 1972 †. Accessed at: https://www.marinespecies.org/foraminifera/aphia.php?p=taxdetails&id=739140 on 2026-08-13
Date
action
by
original description
Voloshina, A. M. (1972). Атаксофрагмииды верхнемеловых отложений Волыно-Подольской окраины Русской платформы - Ataxophragmiidae from the Upper Cretaceous sediments of the Volhyno-Podolia borderland of the Russian platform. <em>Тр. УкрНИГРИ.</em> 27: 55-130. [details] Available for editors 
[request]
original description (of Ataxophragmium (Opertum) Voloshina, 1972 †) Voloshina, A. M. (1972). Атаксофрагмииды верхнемеловых отложений Волыно-Подольской окраины Русской платформы - Ataxophragmiidae from the Upper Cretaceous sediments of the Volhyno-Podolia borderland of the Russian platform. <em>Тр. УкрНИГРИ.</em> 27: 55-130. [details] Available for editors [request]
[request]original description (of Ataxophragmium (Opertum) Voloshina, 1972 †) Voloshina, A. M. (1972). Атаксофрагмииды верхнемеловых отложений Волыно-Подольской окраины Русской платформы - Ataxophragmiidae from the Upper Cretaceous sediments of the Volhyno-Podolia borderland of the Russian platform. <em>Тр. УкрНИГРИ.</em> 27: 55-130. [details] Available for editors
[request]From editor or global species database
Diagnosis Test subglobular, with few gradually enlarging chambers in a low trochospiral coil that is nearly involute on the spiral side, chamber interior subdivided by numerous tiers of internal partial partitions or buttresses that form distinct chamberlets and may be more numerous in later chambers; wall moderately coarsely agglutinated, surface roughened; aperture a low interiomarginal slit on the periphery and may be slightly oblique. U. Cretaceous (U. Campanian to Maastrichtian); USSR: Ukraine, Crimea, W. Siberian depression. (Loeblich & Tappan, 1987, Foraminiferal Genera and Their Classification) [details]
From editor or global species database
Image from typetaxon