Description of the chimaerid jaw and its phylogenetic origins

Journal of Morphology
E D GroganDominique A Didier

Abstract

Anatomical delineation of the holocephalan palatoquadrate has proven to be difficult and, so, has been an extensively debated topic as it relates to the evolutionary derivation of jaws, modes of jaw suspension, and the interrelationships of the hondrichthyes (Elasmobranchii and Holocephali). Embryological analyses of the chimaerid jaw and cranium are presented to provide an anatomical description of the palatoquadrate in modern chimaerids. The palatoquadrate fuses, anteriorly, to the nasal capsule early in development. This marks the first point of contact between the mandibular arch and cranium. Orbitonasal canal foramina delineate the dorsal palatoquadrate margin. The posteriormost margin is marked by fusion of the upper jaw with trabecular and parachordal cartilages in the region of the efferent eudobranchial artery foramen and by a suborbitally positioned basitrabecular cartilage. This basitrabecula generates a subocular shelf as it fuses medially to the parachordal cartilage and posteriorly to the postorbital wall and cranial otic process. The results of these analyses are related to morphological studies of Paleozoic chondrichthyan fishes, particularly the autodiastylic paraselachians that represent morphological intermed...Continue Reading

References

Apr 30, 1993·International Journal of Radiation Oncology, Biology, Physics·L J PetersR A Frankenthaler

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Citations

May 10, 2005·Journal of Morphology·C D Wilga
Dec 12, 2018·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Leif TapanilaAlan Pradel
Jan 12, 2011·Proceedings of the National Academy of Sciences of the United States of America·J Andrew GillisNeil H Shubin
Sep 3, 2014·Journal of Morphology·Jason B RamsayDominique A Didier
Mar 11, 2009·Proceedings of the National Academy of Sciences of the United States of America·Alan PradelPaul Tafforeau
Nov 25, 2011·Journal of Morphology·Mason N DeanLara A Ferry
Jun 1, 2007·Integrative Zoology·Oded Khaner
Jan 1, 2008·CSH Protocols·Marion CoolenSylvie Mazan

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