New genus of Cupressaceae from the Upper Cretaceous of Patagonia (Argentina) fills a gap in the evolution of the ovuliferous complex in the family  

作　　者：Ana Andruchow-Colombo Maria A.Gandolfo Ignacio H.Escapa Nestor R.Cuneo 

机构地区：[1]LH Bailey Hortorium,Plant Biology Section,School of Integrative Plant Science,Cornell University,Ithaca 14853 NY,USA [2]Consejo Nacional de Investigaciones Cientificas y Tecnicas(CONICET),Museo Paleontologico Egidio Feruglio(MEF),Av.Fontana 140,Trelew 9100 Chubut,Argentina

出　　处：《Journal of Systematics and Evolution》2022年第6期1417-1439,共23页植物分类学报（英文版）

基　　金：Financial support has been provided by the Agencia Nacional de Promocion Cientifica y Tecnologica(PICT 2014-2433);the National Science Foundation|grantI numbers DEB-1556666,DEB-1556136,EAR-1925552 to MAG].

摘　　要：The conifer family Cupressaceae encompasses seven subfamilies.Five of them were once considered to constitute the family Taxodiaceae,later eliminated because of its paraphyletic nature but remaining as an informal category for early-diverging Cupressaceae lineages.Among the taxodiaceous subfamilies,Athrotaxoideae shows a unique morphology in its ovuliferous complexes(OCs)and a phylogenetically unexplored fossil record.We describe the new genus and species Patagotaxodia lefipanensis,based on OC adpressions associated with leafy branches collected at the Maastrichtian section of the Lefipán Formation(Patagonia,Argentina),and we refer it to Athrotaxoideae.We include Patagotaxodia in total evidence phylogenetic analysis to test its affinity,and we recover it within the subfamilies Athrotaxoideae or Cunninghamioideae.However,we argue that the characters supporting the athrotaxoid affinity are more meaningful in a taxodiaceous systematic context.This placement is also supported by taxon inclusion-exclusion experiments.We discuss the position of other Cretaceous athrotaxoid records.With basis on the morphological insights provided by the OC morphology of extant and extinct Athrotaxoideae,we study the evolution of the OC morphology in the family in a phylogenetic context and discuss the results in the light of the fossil record of the family.We discuss how and when the different morphologies appeared in the family.Based on phylogenetic,temporal,morphological,and ontogenetic evidence,we conclude that the OC morphology shown by the subfamily Athrotaxoideae is intermediate between two of the most common morphologies within extant and extinct Cupressaceae species,one of which would show adaptative advantages over basal morphologies.

关 键 词：Athrotaxis Athrotaxoideae Cunninghamioideae Cupressaceae Phylogeny Elatides ovuliferous complex evolution Patagotaxodia Protodammara seed cone evolution TAXODIACEAE 

分 类 号：Q94[生物学—植物学]