A Comprehensive Review of the Morphological Diversity of the Quadrate Bone in Mosasauroids (Squamata: Mosasauroidea), with Comments on the Homology of the Infrastapedial Process

Translated title of the contribution: A Comprehensive Review of the Morphological Diversity of the Quadrate Bone in Mosasauroids (Squamata: Mosasauroidea), with Comments on the Homology of the Infrastapedial Process

Alessandro Palci, Takuya Konishi, Michael W. Caldwell

Research output: Contribution to journalArticlepeer-review

Abstract

We examined a selection of three-dimensionally preserved quadrate bones from representatives of all major clades of mosasauroid reptiles, an extinct group of marine lizards inclusive of aigialosaurs and mosasaurs (Squamata, Mosasauroidea). The quadrate bones appear to be very diverse within and across mosasauroid clades, and show variable combinations of ridges, crests, and processes. Because of its complex features and diversity, taxonomists have often relied quite heavily on quadrate morphology both in alpha-level classification of mosasauroids and for use as characters in phylogenetic analyses. However, the terminology applied to some quadrate features has been inconsistent, in particular regarding the ‘infrastapedial process.’ Such a lack of clarity of even anatomical terms hampers our understanding of the evolution of the morphology of this complex bone. Here we provide a comprehensive comparison of mosasauroid quadrates contextualized against a recent phylogeny of the group, and demonstrate that some features of the posteroventral region of these bones are likely homoplastic and require the establishment of a new set of anatomical terms.

Translated title of the contributionA Comprehensive Review of the Morphological Diversity of the Quadrate Bone in Mosasauroids (Squamata: Mosasauroidea), with Comments on the Homology of the Infrastapedial Process
Original languageAmerican English
Article numbere1879101
Number of pages11
JournalJournal of Vertebrate Paleontology
Early online date12 Mar 2021
DOIs
Publication statusE-pub ahead of print - 12 Mar 2021

Keywords

  • Morphological Diversity
  • Mosasauroids
  • Homology
  • Infrastapedial Process
  • aigialosaurs
  • mosasaurs

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