Mesoceratocanthus Fossils from the Early Cretaceous of China Reinterpreted as the Earliest Passaloids (Coleoptera: Scarabaeoidea)

IF 1.2 4区地球科学 Q3 PALEONTOLOGY

Ameghiniana Pub Date : 2022-05-26 DOI:10.5710/AMGH.26.04.2022.3502

Yan‐Da Li, Erik Tihelka, Christopher J. Marshall, D. Maddison, M. Bai, Diying Huang, Chen-yang Cai

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Abstract

Abstract. The scarabaeoid beetle Mesoceratocanthus from the Early Cretaceous Yixian Formation was originally placed in the extant tribe Ivieolini (Hybosoridae). Our re-examination of the holotype and a new specimen demonstrates that Mesoceratocanthus does not possess the diagnostic characters of Ivieolini or Hybosoridae. Instead, it should be assigned to the passaloid lineage (Passalopalpidae + Passalidae) and appears closely related to the extinct family Passalopalpidae. The revised placement of Mesoceratocanthus further extends the earliest occurrence of the passaloid clade (∼125 Ma, Barremian to early Aptian). Resumen. El escarabajo scarabaeoideo Mesoceratocanthus de la Formación Yixian del Cretácico Inferior se asignó originalmente a la tribu existente Ivieolini (Hybosoridae). El nuevo examen del holotipo y de un nuevo espécimen demuestran que Mesoceratocanthus no posee los caracteres diagnósticos de Ivieolini o Hybosoridae. En cambio, debería asignarse al linaje passaloideo (Passalopalpidae + Passalidae) estando estrechamente relacionado con la familia extinta Passalopalpidae. La nueva asignación de Mesoceratocanthus cambia la primera aparición del clado passaloide (∼ 125 Ma, del Barremiano al Aptiano temprano).

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中国早白垩世中角兽化石被重新诠释为最早的金龟子类(鞘翅目:金龟子总科)

摘要。早白垩世义县组的甲虫中齿甲虫最初位于前伊维奥里尼部落（hybosoridae）。我们对全型和一个新标本的重新检查表明，中角龙不具有伊维奥里尼或葫芦科的诊断特征。相反，它应该被分配到Passaloid Lineage（Passalopapidae+Passalidae），并且似乎与已灭绝的Passalopapidae家族密切相关。Mesoceratocanthus的修订位置进一步延长了Passaloid Clade的最早发生时间（~125 Ma，Barremian至Early Aptian）。总结。下白垩纪义县组中的甲虫最初被分配到现有的伊维奥里尼部落（hybosoridae）。对全型和新标本的新检查表明，中角龙不具有伊维奥里尼或鬣蜥科的诊断特征。相反，它应该被分配到passaloideo谱系（passalopapidae+passalidae），与已灭绝的passalopapidae家族密切相关。Mesoceratocanthus的新分配改变了Passaloid分支的首次出现（～125 Ma，从Barremian到早期Aptian）。

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来源期刊

Ameghiniana 地学-古生物学

CiteScore

2.50

自引率

10.00%

发文量

期刊介绍： Ameghiniana is a bimonthly journal that publishes original contributions on all disciplines related to paleontology, with a special focus on the paleontology of Gondwana and the biotic history of the southern hemisphere. Published yearly since 1957, it has undoubtedly become the main palaeontological publication from Latin America. Ameghiniana has recently broadened its editorial board, reorganized its production process, and increased to a bimonthly frequency, which resulted in a significant decrease in the turn around time.