The buccal apparatus with radula of a ceratitic ammonoid from the German Middle Triassic

Ammonoid Buccal Mass and Jaw Apparatus

“…10.4a, 10.8.1, 10.8.2, 10.8.3;Closs 1967;Saunders and Richardson 1979;Mapes 1987;Bandel 1988;Tanabe and Mapes 1995;Doguzhaeva et al 1997), and Ceratitina (F ig. 10.8.4, 10.8.5;Zakharov 1974;Dagys and Weitschat 1988;Klug and Jerjen 2012). The remaining four jaw morphotypes are known from the order Ammonitida of Jurassic and Cretaceous age (Table 10.1, F ig.…”

Ammonoid Radula

“…This radula, although not attributed to a precise taxon, may belong to a cephalopod stem group (Firby and Durham 1974;Engeser 1996). Recent discoveries of fossil radulae in ammonoids (Klug and Jerjen 2012;Kruta et al 2011Kruta et al , 2013Kruta et al , 2014 seem to reinforce this hypothesis, as all the specimens have 7 teeth per row. The number of marginal elements (absent, 2 or 4) seem to be more variable compared to what Lehmann (1967) …”

“…Techniques using computerized tomography (µCT scan, PPC SRµCT scan) have been successfully applied in recent studies (e.g. Kruta et al 2011;Klug and Jerjen 2012;Kruta et al 2013Kruta et al , 2014 to describe the anatomy of fossil radular structures in ammonoids exploiting the differences in composition (absorption contrast) between the teeth and the matrix or gaps between them.…”

“…l Rhaeboceras halli (Campanian, Scaphitoidea). (Modified from Kruta et al 2013) penndorfi from the German Muschelkalk (Klug and Jerjen 2012). The radula remains was found between the beak elements and in the buccal mass area, behind the two mandibles.…”

Non-destructive, safe removal of conductive metal coatings from fossils: a new solution

“…They mostly occur individually, but are rarely preserved in situ within the body chambers (e.g., Lehmann, 1967Lehmann, , 1971Lehmann, , 1979Mutvei, 1992, 1993;Tanabe and Landman, 2002;Kruta et al, 2010Kruta et al, , 2011Landman et al, 2010;Tanabe et al, 2012Tanabe et al, , 2013Klug and Jerjen, 2012). Especially when preserved in calcareous and phosphate concretions, they generally retain their original three-dimensional morphology, although their primarily organic composition is replaced by phosphate minerals during diagenesis (Kanie, 1982;Tanabe and Fukuda, 1983;Tanabe et al, 2012;Gupta et al, 2008).…”