A fork-tailed coelacanth,<i>Rebellatrix divaricerca</i>, gen. et sp. nov. (Actinistia, Rebellatricidae, fam. nov.), from the Lower Triassic of Western Canada

Wendruff, Andrew J.; Wilson, Mark V. H.

doi:10.1080/02724634.2012.657317

Cited by 35 publications

(46 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…-Actinistians are known since the Devonian and they reached their highest generic richness in the Early Triassic, with at least 12 valid genera (Forey 1998, Schultze 2004, Tong et al 2006, Wendruff & Wilson 2012. Today, these lobe-finned fishes are represented by the 'living fossil' Latimeria.…”

Section: Actinopterygii Indetmentioning

confidence: 99%

See 1 more Smart Citation

Saurichthys and other fossil fishes from the late Smithian (Early Triassic) of Bear Lake County (Idaho, USA), with a discussion of saurichthyid palaeogeography and evolution

Romano¹,

Kogan²,

Jenks³

et al. 2012

Bull. Geosci.

View full text Add to dashboard Cite

A new marine fish assemblage from the late Smithian (Olenekian, Early Triassic) Anasibirites beds of the Thaynes Formation collected near Georgetown (Bear Lake County, south-east Idaho, USA) comprises actinopterygians (Saurichthys cf. elongatus, Actinopterygii indet.), sarcopterygians (Actinistia indet.), and possibly chondrichthyans. We review the global fossil record of the Triassic lower actinopterygian Saurichthys, which is used herein for a case study of trends in morphological adaptations as well as variations in palaeogeographic distribution and diversity dynamics of Early Mesozoic fishes. In the Early Triassic, Saurichthys already occupied a top position in marine food webs, with some species achieving body lengths of up to 1.5 m. Distribution of morphological characters in Saurichthys during the Triassic suggests trends towards a reduction in squamation, stiffening of the fins and axial skeleton, shortening of the postorbital portion of the cranium, and reduction in the number of dermal skull bones. The postcranial adaptations in particular helped to improve the fast-start ability of these ambush predatory fishes. The palaeogeographic range of Saurichthys changed from a virtually global distribution in the Early Triassic (indicating rapid dispersal within marine and freshwater ecosystems after the end-Permian mass extinction) to an occurrence mainly restricted to the north-western Tethys in the Late Triassic, and also towards increasing rarity within continental deposits. Modifications in the palaeogeographic distribution were accompanied by successive loss in global species richness and were possibly related to intra-Triassic extinction events, environmental alterations and/or competition. •

show abstract

Section: Actinopterygii Indetmentioning

confidence: 99%

“…3, fig. c), Rebellatrix (Wendruff & Wilson 2012, fig. 1), Rhabdoderma madagascariensis (Lehman 1952, pl.…”

Section: Actinopterygii Indetmentioning

confidence: 99%

Saurichthys and other fossil fishes from the late Smithian (Early Triassic) of Bear Lake County (Idaho, USA), with a discussion of saurichthyid palaeogeography and evolution

Romano¹,

Kogan²,

Jenks³

et al. 2012

Bull. Geosci.

View full text Add to dashboard Cite

show abstract

“…Rebellatrix divaricerca is an unusual fork-tailed coelacanth from the Lower Triassic of Canada known mostly by post-cranial characters (Wendruff and Wilson 2012). A cladistic analysis by Wendruff and Wilson (2012) resolved Rebellatrix as the sister-group of Latimerioidei on the basis of a single shared character, 'expanded occipital neural aches' (char.…”

Section: Discussionmentioning

confidence: 99%

Dobrogeria aegyssensis, a new early Spathian (Early Triassic) coelacanth from North Dobrogea (Romania)

Cavin¹,

Grădinaru²

2014

Acta Geologica Polonica

View full text Add to dashboard Cite

ABSTRACT:Cavin, L. and Grădinaru, E. 2014. Dobrogeria aegyssensis, a new early Spathian (Early Triassic) coelacanth from North Dobrogea (Romania). Acta Geologica Polonica, 64 (2), 161-187. Warszawa.The Early Triassic witnessed the highest taxic diversity of coelacanths (or Actinistia), a clade with a single living genus today. This peak of diversity is accentuated here with the description of a new coelacanth discovered in the lower Spathian (Upper Olenekian, Lower Triassic) cropping out in the Tulcea Veche (Old Tulcea) promontory, in the city of Tulcea, in North Dobrogea, Romania. The bone remains were preserved in a block of limestone, which was chemically dissolved. The resulting 3D and matrix-free ossifications correspond mostly to elements of the skull and branchial apparatus. Posterior parietals, postparietal with associated prootic and basisphenoid allow a precise description of the neurocranium. Ossifications of the lower jaw, together with branchial and pectoral elements, complete the description of this coelacanth and support the coining of a new generic and specific name, Dobrogeria aegyssensis. A phylogenetic analysis of actinistians with the new species recovers clades which were found in most recent analyses, i.e. the Sasseniidae, the Laugiidae, the Coelacanthiformes, the Latimerioidei, the Mawsoniidae and the Latimeriidae, and identifies the new taxon as a non-latimerioid coelacanthiform.

show abstract

“…Insights & Perspective ..... and haemal arches, as well as in the spacing throughout the abdominal and caudal regions, suggesting that they probably had diverse modes of locomotion [3,42]. In addition, an examination of the skeleton of the fossil genus Macropoma (approximately 70 Ma), the sister group of Latimeria and the only known fossil actinistian record from the Cretaceous to the present [43], shows some interesting differences.…”

Section: Casane and P Laurentimentioning

confidence: 99%

“…Note that the body shape of Latimeria chalumnae differs significantly from that of its closest relative, Macropoma lewesiensis. Adapted from [3,42,43].…”

Section: 'Living Fossils' From a Treethinking Perspectivementioning

confidence: 99%

Why coelacanths are not ‘living fossils’

Casañe

Laurenti

2013

BioEssays

View full text Add to dashboard Cite

A series of recent studies on extant coelacanths has emphasised the slow rate of molecular and morphological evolution in these species. These studies were based on the assumption that a coelacanth is a 'living fossil' that has shown little morphological change since the Devonian, and they proposed a causal link between low molecular evolutionary rate and morphological stasis. Here, we have examined the available molecular and morphological data and show that: (i) low intra-specific molecular diversity does not imply low mutation rate, (ii) studies not showing low substitution rates in coelacanth are often neglected, (iii) the morphological stability of coelacanths is not supported by paleontological evidence. We recall that intra-species levels of molecular diversity, inter-species genome divergence rates and morphological divergence rates are under different constraints and they are not necessarily correlated. Finally, we emphasise that concepts such as 'living fossil', 'basal lineage', or 'primitive extant species' do not make sense from a tree-thinking perspective.

show abstract

A fork-tailed coelacanth,Rebellatrix divaricerca, gen. et sp. nov. (Actinistia, Rebellatricidae, fam. nov.), from the Lower Triassic of Western Canada

Cited by 35 publications

References 43 publications

Saurichthys and other fossil fishes from the late Smithian (Early Triassic) of Bear Lake County (Idaho, USA), with a discussion of saurichthyid palaeogeography and evolution

Saurichthys and other fossil fishes from the late Smithian (Early Triassic) of Bear Lake County (Idaho, USA), with a discussion of saurichthyid palaeogeography and evolution

Dobrogeria aegyssensis, a new early Spathian (Early Triassic) coelacanth from North Dobrogea (Romania)

Why coelacanths are not ‘living fossils’

Contact Info

Product

Resources

About