صفحه اصلى به روز رسانى در :  شنبه 1 خرداد 1395
ديگر گونه ها
راستهFORAMINIFERIDA
زير راستهTEXTULARIINA
رو خانوادهATAXOPHRAGMIACEA
خانوادهATAXOPHRAGMIIDAE
زير خانوادهPERNERININAE
جنس OPERTUM

OPERTUM Voloshina, 1972
 
 
Type species: Ataxophragmium (Opertum) incognitum Voloshina, 1972; OD.
Ataxophragmium (Opertum) Voloshina, 1972 (*3311), p. 111.
Ataxophragmium (Opertum) Voloshina, 1965 (*3309), p. 150, 154, 155 (name not available, ICZN Art. 13 (a)(i), no description).
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.
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