Pseudodalatias henarejensisnov. sp. a new pseudodalatiid (Elasmobranchii) from the Middle Triassic of Spain

The enameloid microstructure of euselachian (Chondrichthyes) scales

“…The enameloid microstructure of chondrichthyan teeth has repeatedly been studied since the early work of Reif (1973), focusing principally on euselachian sharks (Gillis and Donoghue, 2007 and references therein), and emerged as a useful tool for taxonomic studies of the group (e.g., Reif, 1977Reif, , 1978Duffin, 1980;Cuny et al, 1998;Cuny and Risnes, 2005;Botella et al, 2009a;Guinot and Cappetta, 2011). In fact, changes in the organization of tooth enameloid can be related to the evolutionary history of Chon drichthyes.…”

New Triassic stem selachimorphs (Chondrichthyes, Elasmobranchii) and their bearing on the evolution of dental enameloid in Neoselachii

“…Unfortunately, no specimens of Doratodus teeth with completely intact roots have been recovered so far, thus preventing a direct comparison with the holaulacorhize vascularization (Duffin, 1982) of Vallisia. Pseudodalatias (known from the species P. henarejensis [Ladinian; Botella et al, 2009b] and P. barnstonensis [Norian-Rhaetian;Sykes, 1971;Cuny, 1998]), in contrast to the above-mentioned genera, displays highly specialized cutting-clutching dentition with strong serrations on the crowns of the lower? tooth files.…”

“…tooth files. The root is bilobed with a narrow medial groove (Botella et al, 2009b), but lacking the major basal foramen of Vallisia (Duffin, 1982). More interestingly, the individual crystallites of Pseudodalatias enameloid layer are densely packed and oriented perpendicular to the tooth surface in the inner part of the tissue, whereas superficially they change orientation and run parallel to it (Cuny and Benton, 1999;Botella et al, 2009b).…”

“…The root is bilobed with a narrow medial groove (Botella et al, 2009b), but lacking the major basal foramen of Vallisia (Duffin, 1982). More interestingly, the individual crystallites of Pseudodalatias enameloid layer are densely packed and oriented perpendicular to the tooth surface in the inner part of the tissue, whereas superficially they change orientation and run parallel to it (Cuny and Benton, 1999;Botella et al, 2009b). This highly structured SCE has probably purely adaptive significance, because similar compaction of crystallites has been demonstrated (Duffin and Cuny, 2008) in some hybodonts (Priohybodus d 'Erasmo, 1960, Thaiodus Cappetta et al, 1990 and Carcharopsis prototypus Agassiz, 1843 (Elasmobranchii incertae sedis following Ginter et al, 2010), which possess serrated crown margins.…”

Nuevos enfoques sobre los vertebrados del Pérmico y Triásico de la Península Ibérica, con énfasis en las cuencas Pirenaica y Catalana

“…Several localities in southeastern Iberian Peninsula (Cuenca and Valencia), specially in the Henarejos section, yielded vertebrate remains such as fishes, notho-, nothosauroids and placodonts, as in Cañete-Boniches, Henarejos, Bugarra, Valdemeca and Royuela sites (28,29,30,31,32) (Sanz, 1983;Alafont, 1999;Bardet et al, 2008;Botella et al, 2009;Pla et al, 2009). Fossils are mainly found in the Cañete Dolostones and Limestones Formation.…”