The Giant Cretaceous Coelacanth (Actinistia, Sarcopterygii) Megalocoelacanthus dobiei Schwimmer, Stewart & Williams, 1994, and Its Bearing on Latimerioidei Interrelationships

  title={The Giant Cretaceous Coelacanth (Actinistia, Sarcopterygii) Megalocoelacanthus dobiei Schwimmer, Stewart \& Williams, 1994, and Its Bearing on Latimerioidei Interrelationships},
  author={Hugo Dutel and John G. Maisey and David R. Schwimmer and Philippe Janvier and Marc Herbin and Ga{\"e}l Cl{\'e}ment},
  journal={PLoS ONE},
We present a redescription of Megalocoelacanthus dobiei, a giant fossil coelacanth from Upper Cretaceous strata of North America. Megalocoelacanthus has been previously described on the basis of composite material that consisted of isolated elements. Consequently, many aspects of its anatomy have remained unknown as well as its phylogenetic relationships with other coelacanths. Previous studies have suggested that Megalocoelacanthus is closer to Latimeria and Macropoma than to Mawsonia. However… 
A comprehensive phylogenetic analysis of coelacanth fishes (Sarcopterygii, Actinistia) with comments on the composition of the Mawsoniidae and Latimeriidae: evaluating old and new methodological challenges and constraints
An updated phylogenetic analysis based on a new consensual data matrix is presented, merging most of the emendations proposed over the past two decades, and including a completely reviewed character scoring for some genera.
The first late cretaceous mawsoniid coelacanth (Sarcopterygii: Actinistia) from North America: Evidence of a lineage of extinct ‘living fossils’
The link between a wide geographic distribution and the resilience to extinction demonstrated here for Mawsonia is a clue that a similar situation existed for Latimeria, which allowed this genus to live for tens of millions of years.
The last known freshwater coelacanths: New Late Cretaceous mawsoniid remains (Osteichthyes: Actinistia) from Southern France
Axelrodichthys megadromos is the last representative of the mawsoniids and its occurrence in Europe is probably the result of a dispersal event from Western Gondwana that happened somewhen in the Cretaceous.
A New Fossil Actinistian from the Early Jurassic of Chile and Its Bearing on the Phylogeny of Actinistia
ABSTRACT We present the description and taxonomic reassignment of a new genus and species, Atacamaia solitaria, gen. et sp. nov., from Lower Jurassic strata of northern Chile, South America. The
First Record of Mawsoniid Coelacanths (Actinistia, Sarcopterygii) from the Marine Rhaetian (Upper Triassic) of Bonenburg, Germany
ABSTRACT Coelacanths are represented today by a single genus, Latimeria. They are known to be ‘living fossils’, because their evolutionary history dates back into the Devonian. Through the Upper
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.
New coelacanth material from the Middle Triassic of eastern Switzerland, and comments on the taxic diversity of actinistans
A phylogenetic analysis is performed, which supports that Ticinepomis is nested among the Latimeriidae, and concludes that the Early Triassic peak of diversity was probably caused by a biological radiation, whereas the Late Jurassic peak of observed diversity is probably the result of a Lagerstätten effect.
Axelrodichthys araripensis Maisey, 1986 revisited
New insights are offered on the type species – A. araripensis – based on a complete new description of all its morphological characters and a comparative study of several other Mawsoniidae species.


A cladistic analysis suggests that the new species is the fossil sister taxon to Latimeria, but this close relationship is weakly supported and Nevertheless, Wenzia latimerae belongs with confidence to the Latimeriidae.
New occurrence of Mawsonia (Sarcopterygii: Actinistia) from the Early Cretaceous of the Sanfranciscana Basin, Minas Gerais, southeastern Brazil
Abstract The Cretaceous actinistian Mawsonia is represented by more than 360 dissociated, but well-preserved, bones obtained from the Areado Group in the Sanfranciscana Basin of Minas Gerais, Brazil.
A newly recognized fossil coelacanth highlights the early morphological diversification of the clade
Coelacanths have long had an iconic place in the study of vertebrate evolution for their apparent anatomical conservatism over geological time, but Holopterygius provides clear evidence for rapid morphological evolution early in the history of this clade.
New occurrence of †Mawsoniidae (Sarcopterygii, Actinistia) in the Morro do Chaves Formation, Lower Cretaceous of the Sergipe-Alagoas Basin, Northeastern Brazil Nova ocorrência de †Mawsoniidae (Sarcopterygii, Actinistia) na Formação Morro do Chaves, Cretáceo Inferior da bacia de Sergipe-Alagoas, nord
The goal of this paper is to describe a new occurrence of †Mawsoniidae in the Morro do Chaves Formation, Sergipe- Alagoas Basin. This stratigraphical unit is represented by an intercalation of
The histological structure of the calcified lung of the fossil coelacanth Axelrodichthys araripensis (Actinistia: Mawsoniidae)
The reinforcement of the pulmonary walls by the overlying osseous blades could be interpreted as a means of adapting volumetric changes in the manner of bellows, a necessary function for ventilation in pulmonary respiration.
A Fork-Tailed Coelacanth, Rebellatrix divaricerca, gen. et sp. nov. (Actinistia, Rebellatricidae, fam. nov.), from the Lower Triassic of Western Canada
An unusual fork-tailed coelacanth from the Lower Triassic Sulphur Mountain Formation of British Columbia, Canada, marks the first considerable departure in actinistian body form since the Mississippian Period, and is unique among coelacanths in its possession of a bifurcated caudal fin, reduced segmentation of fin rays, and fusion of caudals.
Herpetichthyes, Amphibioidei, Choanichthyes or Sarcopterygii?
  • A. Romer
  • Environmental Science
  • 1955
DURING recent decades, our ideas on the classification of fishes have changed greatly. In the early years of the century, it was believed that among the higher bony fishes (Osteichthyes), the
Latimeria chalumnae and its pedigree
  • P. Forey
  • Biology
    Environmental Biology of Fishes
  • 2004
It is concluded that throughout coelacanth history there have been changes in the structure of the vertebral column involving an overall increase in the number of vertebral elements, and a consequent crowding of these elements within the abdominal region.
Styloichthys as the oldest coelacanth: Implications for early osteichthyan interrelationships
A revised cladistic analysis places Styloichthys as the most basal coelacanth, which, if correct, fills conspicuous stratigraphic and morphological gaps in the fossil record of this clade.
The actinistian (Sarcopterygii) Piveteauia madagascariensis Lehman from the Lower Triassic of northwestern Madagascar: a redescription on the basis of new material
ABSTRACT A second specimen of Piveteauia madagascariensis (Sarcopterygii, Actinistia) from the Lower Triassic of Madagascar, very well-preserved compared to the holotype, adds to our knowledge of the