{"refrec":{"BRefID":317740,"RR":"<b>Schroeder, R.</b> (1975). General evolutionary trends in Orbitolinas. <i>Rev. Esp. Micropaleontol. Numero Especial</i>: 117-128","BEntID":311177,"PublicFlag":1,"CheckedFlag":0,"wosflag":0,"vabbflag":0,"RefStringPartII":". <i>Rev. Esp. Micropaleontol. Numero Especial</i>: 117-128","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Schroeder, R.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Schroeder, R.","Englishabstract":"After a short survey about the most important structural elements of Orbitolinas the author discusses at first the origin of this foraminiferal group. The first true Orbitolinas have developed from <i>Praeorbitolina</i> Schroeder 1964 at the boundary Lower Aptian /Upper Aptian. <i>Palorbitolina</i> Schroeder 1963 (containing <i>Orbitolina lenticularis</i>) does not belong to the true Orbitolinas. Within the genus <i>Orbitolina</i>, at present, one can differentiate between three general evolution lines, which I have given the status of subgenera: <i>0. (Mesorbitolina) Schroeder 1962, <i>0 . (Orbitolina</i>) D’Orbigny 1850 and <i>0. (Conicorbitolina)</i> Schroeder 1973. 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