Colobops: a juvenile rhynchocephalian reptile (Lepidosauromorpha), not a diminutive archosauromorph with an unusually strong bite

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Colobops : a juvenile rhynchocephalian reptile (Lepidosauromorpha), not a diminutive archosauromorph with an unusually strong bite. / Scheyer, Torsten M.; Spiekman, Stephan; Sues, Hans-Dieter; Ezcurra, Martin; Butler, Richard; Jones, Marc.

In: Royal Society Open Science, Vol. 7, No. 3, 192179, 25.03.2020.

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Scheyer, Torsten M. ; Spiekman, Stephan ; Sues, Hans-Dieter ; Ezcurra, Martin ; Butler, Richard ; Jones, Marc. / Colobops : a juvenile rhynchocephalian reptile (Lepidosauromorpha), not a diminutive archosauromorph with an unusually strong bite. In: Royal Society Open Science. 2020 ; Vol. 7, No. 3.

Bibtex

@article{8abc9e7d2bea48d8a16239361e40204e,
title = "Colobops: a juvenile rhynchocephalian reptile (Lepidosauromorpha), not a diminutive archosauromorph with an unusually strong bite",
abstract = "Correctly identifying taxa at the root of major clades or the oldest clade-representatives is critical for meaningful interpretations of evolution. A small, partially crushed skull from the Late Triassic (Norian) of Connecticut, USA, originally described as an indeterminate rhynchocephalian saurian, was recently named Colobops noviportensis and reinterpreted as sister to all remaining Rhynchosauria, one of the earliest and globally distributed groups of herbivorous reptiles. It was also interpreted as having an exceptionally reinforced snout and powerful bite based on an especially large supratemporal fenestra. Here, after a re-analysis of the original scan data, we show that the skull was strongly dorsoventrally compressed postmortem, with most bones out of life position. The cranial anatomy is consistent with that of other rhynchocephalian lepidosauromorphs, not rhynchosaurs. The {\textquoteleft}reinforced snout{\textquoteright} region and the {\textquoteleft}exceptionally enlarged temporal region{\textquoteright} are preservational artefacts and not exceptional among clevosaurid rhynchocephalians. Colobops is thus not a key taxon for understanding diapsid feeding apparatus evolution.",
keywords = "Diapsida, feeding apparatus, Colobops, noviportensis, Rhynchocephalia, Triassic",
author = "Scheyer, {Torsten M.} and Stephan Spiekman and Hans-Dieter Sues and Martin Ezcurra and Richard Butler and Marc Jones",
year = "2020",
month = mar,
day = "25",
doi = "10.1098/rsos.192179",
language = "English",
volume = "7",
journal = "Royal Society Open Science",
issn = "2054-5703",
publisher = "The Royal Society",
number = "3",

}

RIS

TY - JOUR

T1 - Colobops

T2 - a juvenile rhynchocephalian reptile (Lepidosauromorpha), not a diminutive archosauromorph with an unusually strong bite

AU - Scheyer, Torsten M.

AU - Spiekman, Stephan

AU - Sues, Hans-Dieter

AU - Ezcurra, Martin

AU - Butler, Richard

AU - Jones, Marc

PY - 2020/3/25

Y1 - 2020/3/25

N2 - Correctly identifying taxa at the root of major clades or the oldest clade-representatives is critical for meaningful interpretations of evolution. A small, partially crushed skull from the Late Triassic (Norian) of Connecticut, USA, originally described as an indeterminate rhynchocephalian saurian, was recently named Colobops noviportensis and reinterpreted as sister to all remaining Rhynchosauria, one of the earliest and globally distributed groups of herbivorous reptiles. It was also interpreted as having an exceptionally reinforced snout and powerful bite based on an especially large supratemporal fenestra. Here, after a re-analysis of the original scan data, we show that the skull was strongly dorsoventrally compressed postmortem, with most bones out of life position. The cranial anatomy is consistent with that of other rhynchocephalian lepidosauromorphs, not rhynchosaurs. The ‘reinforced snout’ region and the ‘exceptionally enlarged temporal region’ are preservational artefacts and not exceptional among clevosaurid rhynchocephalians. Colobops is thus not a key taxon for understanding diapsid feeding apparatus evolution.

AB - Correctly identifying taxa at the root of major clades or the oldest clade-representatives is critical for meaningful interpretations of evolution. A small, partially crushed skull from the Late Triassic (Norian) of Connecticut, USA, originally described as an indeterminate rhynchocephalian saurian, was recently named Colobops noviportensis and reinterpreted as sister to all remaining Rhynchosauria, one of the earliest and globally distributed groups of herbivorous reptiles. It was also interpreted as having an exceptionally reinforced snout and powerful bite based on an especially large supratemporal fenestra. Here, after a re-analysis of the original scan data, we show that the skull was strongly dorsoventrally compressed postmortem, with most bones out of life position. The cranial anatomy is consistent with that of other rhynchocephalian lepidosauromorphs, not rhynchosaurs. The ‘reinforced snout’ region and the ‘exceptionally enlarged temporal region’ are preservational artefacts and not exceptional among clevosaurid rhynchocephalians. Colobops is thus not a key taxon for understanding diapsid feeding apparatus evolution.

KW - Diapsida

KW - feeding apparatus

KW - Colobops

KW - noviportensis

KW - Rhynchocephalia

KW - Triassic

U2 - 10.1098/rsos.192179

DO - 10.1098/rsos.192179

M3 - Article

VL - 7

JO - Royal Society Open Science

JF - Royal Society Open Science

SN - 2054-5703

IS - 3

M1 - 192179

ER -