128009 20240319081027.0 doi 10.1080/08912963.2022.2054712 sideral 128855 ART-2022-128855 eng Guillaume, Alexandre R. D. Plasticity in the morphology of the fused frontals of Albanerpetontidae (Lissamphibia; Allocaudata) 2022 Access copy available to the general public Unrestricted Albanerpetontidae form an enigmatic extinct group of lissamphibians, ranging from the early Bathonian to the early Pleistocene. The Upper Jurassic outcrops of Portugal yield a large collection of material, suitable for addressing the intraspecific variation in and diagnostic potential of the characteristic fused frontals. We revise 58 specimens from the Guimarota beds of the Kimmeridgian Alcobaca Formation and describe 62 new frontal bones from the Kimmeridgian - Tithonian Lourinha Formation. Smaller specimens exhibit a vermicular dorsal ornamentation, while it is polygonal in larger specimens and other albanerpetontids. Compared to small specimens, larger specimens display: (1) larger ventrolateral crests extending posteriorly after the parietal margin; (2) a relatively shorter internasal process; (3) a frontal width across posterior edges relatively smaller; and (4) a ventromedian crest less pronounced. Morphometric analyses suggest a single species with different ontogenetic stages. Specimens are attributed to aff. Celtedens sp., based on a bell-shaped outline with a curved orbital margin (although variable in Portuguese specimens), and a flabellate, bulbous-shaped internasal process. The species is more similar to C. megacephalus than C. ibericus, but its phylogenetic position comprises an unresolved trichotomy. Our results show that intraspecific variation and homoplasy render the fused frontal non-diagnostic below the generic level. info:eu-repo/semantics/openAccess by-nc http://creativecommons.org/licenses/by-nc/3.0/es/ 1.4 2022 PALEONTOLOGY 30 / 54 = 0.556 2022 Q3 T2 0.551 2022 Agricultural and Biological Sciences (miscellaneous) 2022 Q1 3.5 2022 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Natario, Carlos Mateus, Octavio Moreno-Azanza, Miguel Universidad de Zaragoza (orcid)0000-0002-7210-1033 2000 655 Universidad de Zaragoza Dpto. Ciencias de la Tierra Área Paleontología 35, 4 (2022), 537-554 Hist. Biol Historical Biology 0891-2963 5006986 http://zaguan.unizar.es/record/128009/files/texto_completo.pdf Postprint 960687 http://zaguan.unizar.es/record/128009/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:128009 articulos driver 2024-03-18-16:48:52 ARTICLE