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. 2011 Aug 17;8(1):94–96. doi: 10.1098/rsbl.2011.0690

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Figure 2. — Evolution of mysticete skull features linked to feeding, based on the phylogeny in the study of Fitzgerald [6]. (a–d) Mandibular symphyses in right medial view: (a) Zygorhiza kochii (USNM 11962); (b) Janjucetus hunderi (specimen represented by NMV P229455 and USNM 534009); (c) Aetiocetus weltoni (UCMP 122900) and (d) Balaenoptera acutorostrata (NMV C24936). Dagger symbol (†) denotes extinct clades. rss, rugose symphyseal surface; sg, symphyseal groove; sss, smooth symphyseal surface. Cetacean artwork by C. Buell.