AperTO - Archivio Istituzionale Open Access dell'Università di Torino Structural and environmental constraints on reduction of paired appendages among vertebrates This is the author's manuscript Original Citation: Availability: This version is available http://hdl.handle.net/2318/1704663 since 2019-06-18T16:29:36Z Published version: DOI:10.1093/biolinnean/blz097 Terms of use: Open Access Anyone can freely access the full text of works made available as "Open Access". Works made available under a Creative Commons license can be used according to the terms and conditions of said license. Use of all other works requires consent of the right holder (author or publisher) if not exempted from copyright protection by the applicable law. (Article begins on next page) 06 October 2021 Structural and environmental constraints on paired appendages reduction among vertebrates LOREDANA MACALUSO1*, GIORGIO CARNEVALE1, RAFFAELLO CASU2, DANIEL PIETROCOLA1, ANDREA VILLA3,1 and MASSIMO DELFINO1,4 1Dipartimento di Scienze della Terra, Università degli Studi di Torino, Via Valperga Caluso 35, 10125, Torino, Italy 2 Dipartimento di Fisica, Università degli Studi di Torino, Via Pietro Giuria 1, 10125, Torino, Italy 3 Bayerische Staatssammlung für Paläontologie und Geologie, Richard-Wagner-Straße 10, 80333 München, Germany 4 Institut Català de Paleontologia Miquel Crusafont, Universitat Autònoma de Barcelona, Edifici Z (ICTA-ICP), Carrer de les Columnes s/n, Campus de la UAB, E-08193 Cerdanyola del Valles, Barcelona, Spain *Corresponding author. E-mail:
[email protected] 1 ABSTRACT Burrowing habits or complex environments have been generally considered as potential drivers acting on appendicular skeleton reduction and loss among vertebrates. Herein we suggest that this may be the case for lissamphibians and squamates, but that fin loss in fishes is usually prevented due to important structural constraints, as pectoral fins are commonly used to control rolling and pitching.