Early perisphinctid ammonites from the early/late Bajocian boundary interval (Middle Jurassic) from Lókút, Hungary

Mollistephaninae and Frebolditinae, new subfamilies of Middle Jurassic stephanoceratid Ammonoidea

“…Occurrence Phaulostephanus is known from the Humphriesianum Zone of various basins of Europe (Parsons 1976;Pavia 1983a;Fernandez-Lopez 1985;Galácz 2012). Discussion Pavia (1983a) and Pavia and Zunino (2012) confirmed the dimorphic status of this genus.…”

“…(b) Sub-Mediterranean Province (Quenstedt 1882(Quenstedt -1888Fallot and Blanchet 1923;Pavia 1973Pavia , 1983aPavia , b, 2000Fernandez-Lopez 1985, 2014Schlegelmilch 1985;Gomez-Alba 1988;Fernandez-Lopez et al 1989Rulleau 2011;Dietze et al 2010;this paper). (c) Mediterranean Province (Vacek 1886;Parona 1896;Sturani 1964aSturani , b, 1971Géczy 1966;Galácz 1980Galácz , 1986Galácz , 1994Galácz , 2012Sandoval 1983Sandoval , 1990Sadki 1994Sadki , 1996Clari and Pavia 2002; this paper). 2.…”

“…However, Parabigotites displays prominent secondary ribs arching evenly across the venter instead of a discontinuous smooth ventral band. In addition, the septal pattern suggests affinity with Leptosphinctes Buckman, 1920Buckman, (in 1909Buckman, -1930, whose origin in the upper lower Bajocian has been repeatedly discussed (Galácz 2012, and reference therein). Consequently, Parabigotites seems to be a candidate to confirm the Pacific origin of some perisphinctoids low in a biostratigraphical level equivalent to the middle part of the Lower Bajocian in western Tethyan areas.…”

Macroevolution and Paleobiogeography of Jurassic-Cretaceous Ammonoids

“…By comparison, origination and extinction rates for marine metazoans as a group are typically less than 0.1 events per lineage-million years (Foote 2000). Many have noted the relative evolutionary and morphological stability of the suborders Phylloceratina and Lytoceratina, relative to other ammonite suborders Arkell et al 1957;Schindewolf 1962;Houša 1965;Wiedmann 1969;Doguzhaeva and Mikhailova 1981;Donovan et al 1981;Wright 1981;House 1988;Guex 1995;Page 1996;Wright et al 1996;Engeser and Keupp 2002;Blau et al 2008;Page 2008;Galácz 2012;Landman et al 2012;Howarth 2013 (Page 1996; but see Tanabe et al 2003). The superfamily Desmoceratoidea (Perisphinctina) also shows a slower rate of evolution than other groups.…”

“…The dispersal of Jurassic ammonoids through the Hispanic Corridor ( Fig. 8.3a; Smith and Tipper 1986;Moyne et al 2004;Arias 2008;Longridge et al 2008;Fernández-López and Chong Díaz 2011;Galácz 2012;Stevens 2012;Sandoval et al 2013) and Cretaceous ammonoids through the Trans-Saharan Seaway ( Fig. 8.3b; Reyment 1980;Meister et al 1992Meister et al , 1994Courville et al 1998;Courville 2007;Lehmann and Herbig 2009;Nagm et al 2010; Nagm and Wilmsen 2012) have been particularly well-documented.…”