126864 20241125101155.0 doi 10.1002/spp2.1494 sideral 134252 ART-2023-134252 eng Ferratges, Fernando A. (orcid)0000-0002-9532-6972 The oldest dairoidid crab (Decapoda, Brachyura, Parthenopoidea) from the Eocene of Spain 2023 Access copy available to the general public Unrestricted Eubrachyurans, or ‘higher’ true crabs, are the most speciose group of decapod crustaceans and have a rich fossil record extending into the Early Cretaceous. However, most extant families are first found in the fossil record in the Palaeogene, and particularly in the Eocene. Unfortunately, fossils of many early eubrachyuran groups are often fragmentary, and only a few studies have combined extinct and extant taxa in a phylogenetic context using different optimality criteria. Here, we report the dairoidid crab Phrynolambrus sagittalis sp. nov., an enigmatic eubrachyuran from the upper Eocene of Huesca (northern Spain), whose completeness and exquisite preservation permit examination of its anatomy in a phylogenetic context. Dairoidids have previously been considered among the oldest stone crabs (Eriphioidea) or elbow crabs (Parthenopoidea), two disparate and distantly related groups of true crabs living today. Mechanical preparation and computed tomography of the fossil material revealed several diagnostic features that allow a detailed comparison with families across the crab tree of life, and test hypotheses about its phylogenetic affinities. Phrynolambrus sagittalis is the first record of the genus in the Iberian Peninsula, and represents one of the oldest crown parthenopoidean crabs worldwide, expanding our knowledge of the biogeographical distribution of elbow crabs during the Palaeogene, as well as their early origins, anatomical diversity and systematic affinities. Understanding the disparity of Eocene eubrachyurans is pivotal to disentangling the systematic relationships among crown families, and interpreting the spatio-temporal patterns leading to the evolution of modern faunas. info:eu-repo/grantAgreement/ES/DGA/E18 info:eu-repo/grantAgreement/ES/MICINN/CGL2017-85038-P info:eu-repo/grantAgreement/ES/MICINN/FPU17-03623 info:eu-repo/semantics/openAccess by http://creativecommons.org/licenses/by/3.0/es/ 2.3 2023 PALEONTOLOGY 8 / 57 = 0.14 2023 Q1 T1 0.833 2023 Paleontology 2023 Q1 4.5 2023 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Luque, Javier Domínguez, José Luis Ossó, Àlex Aurell, Marcos Universidad de Zaragoza (orcid)0000-0002-2430-7424 Zamora, Samuel (orcid)0000-0002-3917-4628 2000 280 Universidad de Zaragoza Dpto. Ciencias de la Tierra Área Estratigrafía 9, 3 (2023), e1494 [17 pp.] Pap. Palaeontol. Papers in Palaeontology 2056-2799 3220037 http://zaguan.unizar.es/record/126864/files/texto_completo.pdf Versión publicada 2422195 http://zaguan.unizar.es/record/126864/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:126864 articulos driver 2024-11-22-12:08:35 ARTICLE