Body size histories of Shungura Formation reptiles in biotic and abiotic environmental context Author Parker, Abigail K. University of Cambridge Department of Zoology and University Museum of Zoology, Downing Pl, CB 2 3 EJ Cambridge (United Kingdom) and University of Helsinki Department of Computer Science, P. O. Box 68, FI- 00014 Helsinki (Finland) abigail. parker @ helsinki. fi (corresponding author) abigail.parker@helsinki.fi Author Boisserie, Jean-Renaud Centre Français des Études Éthiopiennes, CNRS, Ministère de l’Europe et des affaires étrangères, PO BOX 5554 Addis Ababa (Ethiopia) and Laboratoire Paléontologie Évolution Paléoécosystèmes Paléoprimatologie (PALEVOPRIM), CNRS, Université de Poitiers, 6 rue Michel Brunet, F- 86073 Poitiers (France) jean. renaud. boisserie @ univ-poitiers. fr jean.renaud.boisserie@univ-poitiers.fr Author Müller, Johannes Museum für Naturkunde, Leibniz-Institut für Evolutions- und Biodiversitätsforschung, Invalidenstrasse 43, 10115 Berlin (Germany) johannes. mueller @ mfn. berlin johannes.mueller@mfn.berlin Author Brochu, Christopher A. School of Earth, Environment, and Sustainability, University of Iowa, 123 North Capitol St., Iowa City, Iowa, 52242 IA 52242 (United States) chris-brochu @ uiowa. edu chris-brochu@uiowa.edu Author Head, Jason J. University of Cambridge Department of Zoology and University Museum of Zoology, Downing Pl, CB 2 3 EJ Cambridge (United Kingdom) jjh 71 @ cam. ac. uk jjh71@cam.ac.uk text Comptes Rendus Palevol 2026 2026-02-18 25 2 17 42 https://doi.org/10.5852/cr-palevol2026v25a2 journal article 10.5852/cr-palevol2026v25a2 1777-571X 18760444 urn:lsid:zoobank.org:pub:C4B416C1-9383-4CA5-8A9F-3C317C6ED7A7

APPENDIX 2. — Linear regression equations used to estimate skull length for crocodylian specimens;total body length for vertebral regressions from Iijima & Kubo (2020). * measurement for final two rows, vertebral centrum length, is in mm. Abbreviations: KNM, National Museums of Kenya; N, number of specimens; NHML, Natural History Museum (London); SL, skull length; TBI, Turkana Basin Insitute; TL, total body length.

Taxon	Measurement, x (cm*)	Regression to SL (in cm) Regression and TL (in mm) trained on N =		Sources for regression data
Euthecodon	Mandible length	SL = 0.8754*x + 1.2113	4	KNM-ER 757, KNM-KP 18330, KNM-ER 8260, KNM-LT 26306
	Mandible length to posterior of dentary articulation	SL = 0.8754*x + 1.2113	5	NMK-ER 757, KNM-KP 18330, KNM-ER 8260, KNM-LT 26306, KNM-KP 66227
	Average tooth spacing (excluding two anteriormost tooth sockets)	SL = 19.966*x + 30.446	4	KNM-ER 757, KNM-LT 26306, KNM-ER 8260, KNM-ER 18330
cf. Mecistops	Narrowest width of premaxilla Length of mandibular symphysis	SL = 9.97*x SL = 3.8706*x	1 1	NME L 398 2508A NME L 398 2508A
Crocodylus	Mandible length Mandible length to posterior of dentary articulation	SL = 0.6829*x +6.4381 SL = 0.8206*x + 4.5791	23 19	NHML collections NHML collections
	Length of mandibular symphysis Height of dentary at posterior end of mandibular symphysis	SL = 3.1846*x + 17.789 SL = 13.158*x	20 2	NHML collections NME AL 126-11, L.449-4 (Hadar, Shungura Crocodylus)
	Length between centers of d9-d12 alveoli	SL = 5.1384*x + 8.318	18	NHML collections
	Femur circumference D3-D10 vertebral centrum length C8-D2 vertebral centrum length	SL = 4.8793*x + 1.2857 log(TL) = 1.906 + 0.993*log(x) log(TL) = 2.015 + 0.956*log(x)	4 5 2	NHML collections Iijima & Kubo 2020 Iijima & Kubo 2020