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The Giant Cretaceous Coelacanth (Actinistia, Sarcopterygii) Megalocoelacanthus dobiei Schwimmer, Stewart & Williams, 1994, and Its Bearing on Latimerioidei Interrelationships
- H. Dutel, J. Maisey, D. Schwimmer, P. Janvier, M. Herbin, G. Clément
- BiologyPloS one
- 27 November 2012
The cladistic analysis supports the sister-group relationship of Megalocoelacanthus and Libys within Latimeriidae and suggests that toothless, large-sized coelacanths evolved independently in both Latimer iidae and Mawsoniidae during the Mesozoic.
First Occurrence of a Mawsoniid Coelacanth in the Early Jurassic of Europe
ABSTRACT Coelacanths form a clade of sarcopterygian fishes (lobe-finned vertebrates) that today is represented by a single genus, Latimeria. This genus belongs to a lineage of marine coelacanths, the…
The buccohypophyseal canal is an ancestral vertebrate trait maintained by modulation in sonic hedgehog signaling
It appears that the opening of the buccohypophyseal canal depends upon Shh signaling and that modulation in this pathway most probably accounts for its persistence in phylogeny.
A reevaluation of the anatomy of the jaw-closing system in the extant coelacanth Latimeria chalumnae
A new description of the skull and jaw-closing system in Latimeria chalumnae is provided in order to better understand its skull mechanics during prey capture and it is shown that the m.
Allometric growth in the extant coelacanth lung during ontogenetic development
The presence of a lung is confirmed and its allometric growth in Latimeria chalumnae is discussed, based on a unique ontogenetic series, and the parallel development of a fatty organ for buoyancy control suggests a unique adaptation to deep-water environments.
The biomechanical role of the chondrocranium and sutures in a lizard cranium
- Marc E. H. Jones, F. Gröning, H. Dutel, A. Sharp, M. Fagan, S. Evans
- BiologyJournal of The Royal Society Interface
- 1 December 2017
This work uses multi-body dynamics analysis (MDA) to provide realistic loading conditions for anterior and posterior unilateral biting and a detailed finite element model to examine strain magnitude and distribution and finds that strains within the chondrocranium are greatest during anterior biting and are primarily tensile.
Neurocranial development of the coelacanth and the evolution of the sarcopterygian head
The ontogeny of the neurocranium and brain in Latimeria chalumnae is investigated using conventional and synchrotron X-ray micro-computed tomography as well as magnetic resonance imaging, and insights are provided into the developmental mechanisms that are likely to have underpinned the evolution of Neurocranial diversity in sarcopterygian fishes.
Redescription of the Hyoid Apparatus and Associated Musculature in the Extant Coelacanth Latimeria chalumnae: Functional Implications for Feeding
The coelacanth Latimeria is the only extant vertebrate in which the neurocranium is divided into an anterior and a posterior portion which articulate by means of an intracranial joint. This…
Development and growth of the pectoral girdle and fin skeleton in the extant coelacanth Latimeria chalumnae
Latimeria development supports previous interpretations of the asymmetrical pectoral fin skeleton as being plesiomorphic for coelacanths and sarcopterygians.
A Giant Marine Coelacanth from the Jurassic of Normandy, France
The first occurrence of a giant marine coelacanth from the Jurassic of Europe is reported, showing that gigantism has evolved convergently in these Mesozoic coelacanths.