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Grooves to tubes: evolution of the venom delivery system in a Late Triassic "reptile".
Naturwissenschaften 2010; 97(12):1117-21N

Abstract

Venom delivery systems occur in a wide range of extant and fossil vertebrates and are primarily based on oral adaptations. Teeth range from unmodified (Komodo dragons) to highly specialized fangs similar to hypodermic needles (protero- and solenoglyphous snakes). Developmental biologists have documented evidence for an infolding pathway of fang evolution, where the groove folds over to create the more derived condition. However, the oldest known members of venomous clades retain the same condition as their extant relatives, resulting in no fossil evidence for the transition. Based on a comparison of previously known specimens with newly discovered teeth from North Carolina, we describe a new species of the Late Triassic archosauriform Uatchitodon and provide detailed analyses that provide evidence for both venom conduction and document a complete structural series from shallow grooves to fully enclosed tubular canals. While known only from teeth, Uatchitodon is highly diagnostic in possessing compound serrations and for having two venom canals on each tooth in the dentition. Further, although not a snake, Uatchitodon sheds light on the evolutionary trajectory of venom delivery systems in amniotes and provide solid evidence for venom conduction in archosaur-line diapsids.

Authors+Show Affiliations

Committee on Evolutionary Biology, The University of Chicago, 1025 57th Culver 402, Chicago, IL 60637, USA. mitchelljs@uchicago.eduNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

21060984

Citation

Mitchell, Jonathan S., et al. "Grooves to Tubes: Evolution of the Venom Delivery System in a Late Triassic "reptile"." Die Naturwissenschaften, vol. 97, no. 12, 2010, pp. 1117-21.
Mitchell JS, Heckert AB, Sues HD. Grooves to tubes: evolution of the venom delivery system in a Late Triassic "reptile". Naturwissenschaften. 2010;97(12):1117-21.
Mitchell, J. S., Heckert, A. B., & Sues, H. D. (2010). Grooves to tubes: evolution of the venom delivery system in a Late Triassic "reptile". Die Naturwissenschaften, 97(12), pp. 1117-21. doi:10.1007/s00114-010-0729-0.
Mitchell JS, Heckert AB, Sues HD. Grooves to Tubes: Evolution of the Venom Delivery System in a Late Triassic "reptile". Naturwissenschaften. 2010;97(12):1117-21. PubMed PMID: 21060984.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Grooves to tubes: evolution of the venom delivery system in a Late Triassic "reptile". AU - Mitchell,Jonathan S, AU - Heckert,Andrew B, AU - Sues,Hans-Dieter, PY - 2010/07/21/received PY - 2010/10/12/accepted PY - 2010/09/24/revised PY - 2010/11/10/entrez PY - 2010/11/10/pubmed PY - 2011/8/24/medline SP - 1117 EP - 21 JF - Die Naturwissenschaften JO - Naturwissenschaften VL - 97 IS - 12 N2 - Venom delivery systems occur in a wide range of extant and fossil vertebrates and are primarily based on oral adaptations. Teeth range from unmodified (Komodo dragons) to highly specialized fangs similar to hypodermic needles (protero- and solenoglyphous snakes). Developmental biologists have documented evidence for an infolding pathway of fang evolution, where the groove folds over to create the more derived condition. However, the oldest known members of venomous clades retain the same condition as their extant relatives, resulting in no fossil evidence for the transition. Based on a comparison of previously known specimens with newly discovered teeth from North Carolina, we describe a new species of the Late Triassic archosauriform Uatchitodon and provide detailed analyses that provide evidence for both venom conduction and document a complete structural series from shallow grooves to fully enclosed tubular canals. While known only from teeth, Uatchitodon is highly diagnostic in possessing compound serrations and for having two venom canals on each tooth in the dentition. Further, although not a snake, Uatchitodon sheds light on the evolutionary trajectory of venom delivery systems in amniotes and provide solid evidence for venom conduction in archosaur-line diapsids. SN - 1432-1904 UR - https://www.unboundmedicine.com/medline/citation/21060984/Grooves_to_tubes:_evolution_of_the_venom_delivery_system_in_a_Late_Triassic_"reptile"_ L2 - https://dx.doi.org/10.1007/s00114-010-0729-0 DB - PRIME DP - Unbound Medicine ER -