《Table 1 The ossified elements of the hyobranchium in different fossil taxa》

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《河北围场下白垩统围场皇家螈(Regalerpeton weichangensis)(两栖类:有尾类)的再研究（英文）》

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Based on:1) Skutschas and Martin，2011；2) Gao et al.，1998；3) Dong and Wang，1998；4) Wang，2000；5) Gao and Shubin，2001；6) Gao and Shubin，2003；7) Wang，2004；8) Wang and Evans，2006；9) Gao and Shubin，2012；10) Jia and Gao，2016a；11) Jia and Gao，2016b.

The hyobranchium lies in the floor of the mouth and supports the tongue.It varies in its configuration in different species（Table 1）.In Chunerpeton，Beiyanerpeton，Qinglongtriton，and Regalerpeton，the hyobranchium consists of ossified hypobranchial I，hypobranchial II and basibranchial II，but the shape of basibranchial II differs among these taxa（Fig.7）.It is triradiate in Regalerpeton.However，in Beiyanerpeton，basibranchial I and II are co-ossified to form a trident-shaped element with slender arms extending anteriorly and anterolaterally（Gao and Shubin，2012）.In Chunerpeton，basibranchial II is trident-shaped（Gao and Shubin，2003），whereas in Qinglongtriton，it is more complex in shape，with paired anterolateral and posterolateral processes fused to a median rod（Jia and Gao，2016a）.In modern salamanders，the paired ossified hypobranchial I and hypobranchial II and paralleled to each other，this occurs in the larval and neotenic salamanders like Siren intermedia，Pachyhynobius shangchengensis，Batrachuperus mustersi，Pseudobranchus striatus，Proteus anguinus，Amphiuma means，Desmognathus aeneus（Deban and Wake，2000；Rose，2003；Xiong et al.，2013）.Accordingly，pairs of hypobranchial I and hypobranchial II present in fossil taxon are considered larval hyobranchium.