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Phylogenetic relationships of LebachacanthidaeSoler-Gijón 1997 (Xenacanthiformes; Elasmobranchii)

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Kurzfassung

Die Familie Lebachacanthidae war für„Orthacanthus“ senkenbergianus, einen Xenacanthiformen aus dem unteren Perm von Lebach (Deutschland), aufgestellt worden. Die Gültigkeit der Familie ist in Frage gestellt worden, und die TypartLebachacanthus senkenbergianus wurde in die GattungOrthacanthus Agassiz 1843, UntergattungLebachacanthus Soler-Gijón 1997 eingegliedert. Argumente gegen ein solches Vorgehen werden hier vorgelegt. Eine neue phylogenetische Analyse wird durchgeführt, um die Verwandtschaftsbeziehungen der Lebachacanthidae zu den übrigen Xenacanthiformen zu untersuchen.Hagenoselache, ein vor kurzem beschriebener Xenacanthiforme aus dem Namur Deutschlands, und neue Daten zur Zahnhistologie werden in die Verwandschaftsanalyse einbezogen. Die neue Verwandtschaftanalyse bestätigt die Lebachacanthidae als eigenständige Familie der Xenacanthiformes. Die Lebachacanthidae sind die Schwestergruppe der Xenacanthidae, zu der der echteOrthacanthus gehört.Hagenoselache ist weiter abgeleitet alsDiplodoselache (der primitivste Xenacanthiforme) und stellt die Schwestergruppe der Lebachacanthidae und Xenacanthidae dar. Die phylogenetische Stellung der Lebachacanthidae stimmt mit der Vorstellung des Wirkens von heterochronen Prozessen in der Evolution der xenacanthiden Haie überein. Heterochronie (peramorpher Typ) kann die morphologische Entwicklungsreihe des Dorsalstachels von basalen Xenacanthiformen (Diplodoselachidae) über die Lebachacanthidae zu den fortschrittlichen Xenacanthidae (diese umfassen die GattungenOrthacanthus, Xenacanthus, Triodus undPlicatodus) erklären.

Abstract

The family Lebachacanthidae was erected for“Orthacanthus” senkenbergianus, a xenacanthiform from the Lower Permian of Lebach (Germany). Recently, the validity of the family has been questioned and the type species,Lebachacanthus senkenbergianus, has been included in the genusOrthacanthus Agassiz 1843, subgenusLebachacanthus Soler-Gijón 1997. Arguments against such changes are presented here. Anew phylogenetic analysis is performed in order to determine the relationships of Lebachacanthidae with the rest of xenacanthiforms.Hagenoselache, a xenacanthiform recently described from the Namurian of Germany, is included in the phylogenetic analysis together with new data on tooth histology. The new phylogenetic analysis confirms Lebachacanthidae as a distinct family within Xenacanthiformes. Lebachacanthidae is the sister group of Xenacanthidae which includes trueOrthacanthus. Hagenoselache is more derived thanDiplodoselache (the most primitive xenacanthiform) and is the sister group of the clade formed by Lebachacanthidae and Xenacanthidae. The phylogenetic position of Lebachacanthidae is consistent with the idea of heterochronic processes in the evolution of the xenacanth sharks. Heterochrony (peramorphic type) can explain morphological clines in dorsal spine morphology from basal xenacanthiforms (Diplodoselachidae) through Lebachacanthidae to the derived Xenacanthidae (comprisingOrthacanthus, Xenacanthus, Triodus andPlicatodus).

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Soler-Gijón, R. Phylogenetic relationships of LebachacanthidaeSoler-Gijón 1997 (Xenacanthiformes; Elasmobranchii). Paläont. Z. 74, 363–377 (2000). https://doi.org/10.1007/BF02988107

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