Late Ontogeny in the Small Early Permian Amphibamiform Dissorophoid Pasawioops mayi

Late Ontogeny in the Small Early Permian Amphibamiform Dissorophoid Pasawioops mayi
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早二叠世小型两栖类 Dissorophoid Pasawioops mayi 的个体发育晚期

DOI:
10.1080/02724634.2020.1772800
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发表时间:
2020
影响因子:
1.4
通讯作者:
Maddin HC
Maddin HC
中科院分区:
地球科学4区
文献类型:
--
作者:
Atkins JB;Sourges P;Fröbisch NB;Reisz RR;Maddin HC

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个体发生序列很少被保存在化石记录中,但当它们出现时,它们为研究已灭绝分类群的生活史、发育和进化模式提供了有价值的见解。在这里,我们描述了一个完整的,三维保存的pasawioops mayi(Amphibamiformes, Micropholidae)的头骨,这在以前没有被完全描述过。这两个pasawioopsa的标本连同一个完整的头骨,被解释为个体发生系列的一部分。这两个标本的特征不同,这些特征被认为在temnospondyls个体发育过程中发生了变化,包括口后区域的延伸,腭牙列从小齿群转变为明显较大的牙齿,以及下颌关节的后移。我们调查了以前描述过的两栖类群,并利用来自mpasawioops的个体发生数据来确定其他潜在的个体发生系列(如Eoscopus)。此外,我们简要地比较了双翅虫个体发育序列与已知的olsoniform和micromelerpetontid dissorophoids以及其他早期四足动物谱系的个体发育数据,以确定在这些谱系中个体发育可能或可能不保守的程度。pasawioopsa个体发生的几个方面被发现存在于无尾两栖类动物和两栖类动物(即鳃龙类和两栖类动物)中,揭示了一些个体发生依赖的特征在这一群体中高度保守,而其他四足动物谱系则更广泛地保守。
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 ofPasawioops mayi(Amphibamiformes, Micropholidae), which has not been fully described previously. Together with the holotype, also an intact skull, these two specimens ofPasawioopsare 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 fromPasawioopsto 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 ofPasawioopsare 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.
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