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. 2018 Jan 9;4:1. doi: 10.1186/s40851-017-0083-6

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© The Author(s). 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — a and b Schematized composition of crown gnathostome cranium. Early (a) and late (b) stages of development. Precartilaginous condensation and cartilages are shown in dots. Based on reference [8]. c and d. Early (c) and late (b) stages of chondrocranium in Salmo. Based on reference [42]. e, eye; eth, ethmoidal plate; Fen. bas.-caps., basicapsular fenestra; Fe, hypophys., hypophyseal fenestra; nas, nasal capsule; ns, nasal sac; nt, notochord; occ, occipital cartilage; opt, optic capsule; otc, otic capsule; ov, otic vesicle; pc, parachordals; tr, trabecula; ve, vertebrae