Distribution of pneumatic elements on the cervical column per taxon.
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Presence (+) and absence (-) of pneumatic characters found on the cervical vertebrae from specimens of the 11 taxa studied. The penguin with the pneumatised vertebrae is Pygoscelis papua (NHMUK unregistered). For more details see S1 Table and S3–S13 Tables. Abbreviations: PF, pneumatic foramina; F, fossae; L, laminae; Sept., septated.
创建时间：
2015-12-11
