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Home Latest Update :  3 Tuesday April 2012
Other Genus
OrderFORAMINIFERIDA
Sub OrderROTALIINA
Super FamilyNUMMULITACEA
FamilyASTEROCYCLINIDAE
Genus ASTEROCYCLINA

ASTEROCYCLINA Gümbel, 1870
 

Type species: Calcarina? stellata d'Archiac. 1846 (*65), p. 199 (syn.: Asterodiscus pentagonalis Schafhäutl. 1863 (*2743), p. 108): SD Dollfus. 1889(*967), p. 1226.Asterocyclina Gümbel. 1870(*1337), p. 689. Asterodiscus Schafhäutl. 1863(*2743), p. 107 (non Asterodiscus Ehrenberg. 1840); type species: Asterodiscus
pentagonalis Schafhäutl. 1863, obj.; OD(M).Cisseis Guppy. 1866 (*1341). p. 584 (non Cisseis Laporte
and Gory. 1839): type species: Cisseis asteriscus Guppy,1866: OD(M).Orthophragmina (Asterodiscus) H. Douvillé. 1915(*990), p. 723 (nom. transl).Orthophragmina (Asterodiscocyclina) Berry. 1928 (*216), p. 406: type species: Orthophragmina (Asterodiscocyclina) stewarti Berry. 1928: OD.Orthocyclina van der Vlerk, 1923 (*3300), p. 93: type species: Orthocyclina soeroeanensis van der Vlerk. 1923 = Orthophragmina taramellii Munier-Chalmas. in Schlumberger, 1904 (*2775), p. 131; OD.Isodiscodina van der Weijden, 1940 (*3356), p. 15: type species: Orthophragmina pentagonalis Deprat. 1905 (*933), p. 507(non Asterodiscus pentagonalis Schaf häntl. 1863) = Asterodiscus euyillieri Neumann, 1958(*2243), p. 119: OD(M).Discocyclina (Asterocyclina) Brönnimann. 1940(*360).P. 13(nom, transl.).Test stellate to subdiscoidal, rays may be evident at the surface or only visible in horizontal section, globular megalospheric proto­conch partly embraced by larger reniform deuteroconch, followed by two principal auxiliary chambers, other chambers of the first annulus somewhat smaller, microspheric protoconeh followed by a short nepionic spiral of arcuate chambers, later chambers in annular series, those of successive annuli alternating in position, equatorial chambers not subdivided into chamberlets, later chambers spatulate and finally rectangular in both generations, the median layer thicker and lateral layers reduced toward the periphery, radial zones formed by elongated equatorial chambers in the median plane separated by zones of smaller chambers in the interrays, commonly five rays present but these may increase by intercalation toward the periphery of larger specimens, lateral chambers present on both sides of the median layer, annular stolons at the proximal side of the equatorial chambers and addi­tional stolons may connect chambers with those of adjacent annuli; radial chamber walls well developed, pillars present, appearing as pustules at the surface where they are sur­rounded by rosettes of lateral walls. M. Paleo­cene to U. Eocene; cosmopolitan, tropical and subtropical.
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