Ontogenetic series are rarely preserved in the fossil record, but when present they provide valuable insight into life history, developmental, and evolutionary patterns in extinct taxa. Here, we describe an intact, three-dimensionally preserved skull of Pasawioops mayi (Amphibamiformes, Micropholidae), which has not been fully described previously. Together with the holotype, also an intact skull, these two specimens of Pasawioops are interpreted as part of an ontogenetic series. The two specimens differ in traits that are thought to change during ontogeny in temnospondyls, including elongation of the postorbital region, transformation of the palatal dentition from small groups of denticles to significantly larger teeth, and a posteriorly shifting lower jaw articulation. We survey previously described amphibamiform taxa and use the ontogenetic data derived from Pasawioops to identify other potential ontogenetic series (e.g., Eoscopus). Additionally, we briefly compare amphibamiform ontogenetic series to known ontogenetic data of olsoniform and micromelerpetontid dissorophoids, and other early tetrapod lineages, to determine the extent to which ontogeny may or may not be conserved across these lineages. Several aspects of the ontogeny of Pasawioops are found to be present in lissamphibians and Amphibamiformes (i.e., branchiosaurids and amphibamids), revealing that some ontogeny-dependent traits are highly conserved within this group, whereas others are more broadly conserved across other tetrapod lineages.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.