Hagfish from the Cretaceous Tethys Sea and a reconciliation of the morphological–molecular conflict in early vertebrate phylogeny

@article{Miyashita2019HagfishFT,
  title={Hagfish from the Cretaceous Tethys Sea and a reconciliation of the morphological–molecular conflict in early vertebrate phylogeny},
  author={Tetsuto Miyashita and Michael I. Coates and Robert Farrar and Peter L. Larson and Phillip L. Manning and Roy A. Wogelius and Nicholas P. Edwards and Jennifer Ann{\'e} and Uwe Bergmann and A. Richard Palmer and Philip J. Currie},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  year={2019},
  volume={116},
  pages={2146 - 2151}
}
  • Tetsuto Miyashita, M. Coates, P. Currie
  • Published 22 January 2019
  • Biology, Environmental Science, Geography
  • Proceedings of the National Academy of Sciences of the United States of America
Significance Jawless, boneless, and virtually without fossil record, hagfish have long escaped systematists’ grip on their place among other fish. Yet their systematic resolution is critical to define vertebrates as a clade. Here we report an unequivocal fossil hagfish from the Cretaceous Mediterranean. Using this fossil to calibrate the evolutionary history of the group, our analysis supports hagfish and lampreys as sister groups, which likely diverged from one another in early Paleozoic times… 

Figures from this paper

A Paleozoic stem hagfish Myxinikela siroka — revised anatomy and implications for evolution of the living jawless vertebrate lineages

Myxinikela has a number of general features of cyclostomes, including cartilaginous branchial baskets, separation between the esophageal and the branchial passages, and a well-differentiated midline finfold, which give more lamprey-like appearance to this stem hagfish than previously assumed.

A new look at the Cretaceous Lamprey Mesomyzon Chang, Zhang & Miao, 2006 from the Jehol Biota

ABSTRACT Lampreys, one of the remaining two living jawless vertebrates, carry great weight in the study of vertebrate evolution. They have a long history dating back to the Devonian but left a scarce

Functional assessment of morphological homoplasy in stem-gnathostomes

These results confirm that a number of the characters typically used to infer the evolutionary relationships among galeaspids, osteostracans and jawed vertebrates are convergent in nature, potentially obscuring understanding of the assembly of the gnathostome bodyplan.

Functional genetic analysis in a jawless vertebrate, the sea lamprey: insights into the developmental evolution of early vertebrates

How genetic analysis of embryogenesis in the sea lamprey has provided insight into the origin and evolution of developmental-genetic programs in vertebrates is described.

Death is on Our Side: Paleontological Data Drastically Modify Phylogenetic Hypotheses

Predictive models are developed that demonstrate that the possession of distinctive character state combinations is the primary predictor of the degree of induced topological change, and that the relative impact of taxa (fossil and extant) can be predicted to some extent before any analysis.

Phylogeny and evolutionary history of the amniote egg

Except for the amnion, chorioallantois, and amniote type of eggshell, these features evolved convergently in almost all major clades of aquatic vertebrates possibly in response to selective factors such as egg predation, hostile environmental conditions for egg development, or to adjust hatching of young to favorable season.

Total-Evidence Framework Reveals Complex Morphological Evolution in Nightbirds (Strisores)

It is suggested that multiple strisorean lineages have experienced convergent evolution across the skeleton, obfuscating the phylogenetic position of certain fossils, and that many distinctive specializations ofstrisorean subclades were acquired early in their evolutionary history.

A critical appraisal of appendage disparity and homology in fishes

Identifying homologies of morphological traits across large phylogenetic scales is not always straightforward, as many structures are likely to have accrued changes in morphology and function over evolutionary time.

Comparative Approaches in Vertebrate Cartilage Histogenesis and Regulation: Insights from Lampreys and Hagfishes

A model through which these mesenchymal connective tissues acquired distinct histologies and that histological flexibility in cartilage existed in the last common ancestor of modern vertebrates is suggested.

Convergent evolution of elongate forms in craniates and of locomotion in elongate squamate reptiles.

This is the first craniate-wide analysis of how many times elongate body forms have evolved, as well as rates of its evolution and reversion to a non-elongate form, and among the first evidence of locomotor convergence across distantly related, elongate species.
...

References

SHOWING 1-10 OF 296 REFERENCES

Early Jawless Vertebrates and Cyclostome Origins

  • P. Janvier
  • Geography, Environmental Science
    Zoological science
  • 2008
The anatomy and physiology of lampreys and hagfishes are so different that it is difficult to reconstruct an ancestral morphotype of the cyclostomes, assuming that they are a clade, and there is no clear evidence of any fossil taxon that is neither a fossil hagfish nor a fossil lamprey, but would be more closely related to the Cyclostomes than to the gnathostomes.

Craniofacial development of hagfishes and the evolution of vertebrates

The craniofacial development of a series of staged hagfish embryos is described, which shows that their adenohypophysis arises ectodermally, consistent with the molecular phylogenetic data and identifies a pan-cyclostome pattern, one not shared by jawed vertebrates.

The characters of Palaeozoic jawed vertebrates

A clearly stated hierarchy of synapomorphies covering the jaw-bearing stem gnathostomes and osteichthyan and chondrichthyan stem groups is provided and a proposed synapomorphy scheme is used to evaluate the status of the problematic fossil groups Acanthodii and Placodermi.

Lamprey-like gills in a gnathostome-related Devonian jawless vertebrate

This discovery demonstrates that pouches enclosing the gills are primitive for vertebrates, but have been subsequently lost in jawed vertebrates.

Development of the Chondrocranium in Hagfishes, with Special Reference to the Early Evolution of Vertebrates

It is shown that the hagfish and lamprey chondrocrania can be compared perfectly at the level of modules corresponding to the craniofacial primordia constituting the cyclostome morphotype and its diversification in early vertebrate evolution.

Palaeospondylus as a primitive hagfish

The first comparative morphological analysis of hagfish embryos and Palaeospondylus is reported, and a hitherto overlooked resemblance in the chondrocranial elements of these animals is reported; i.e., congruence in the arrangement of the nasal capsule, neurocranium and mandibular arch-derived velar bar.

28S and 18S rDNA sequences support the monophyly of lampreys and hagfishes.

Moderate to very strong support is provided for the monophyly of the cyclostomes in lampreys plus hagfishes and the currently accepted hypothesis of a lamprey-gnathostome clade is moderately rejected by the Kishino-Hasegawa test and resoundingly rejected by parametric bootstrap tests.

Decay of vertebrate characters in hagfish and lamprey (Cyclostomata) and the implications for the vertebrate fossil record

An experimental analysis of decay of vertebrate characters based on the extant jawless vertebrates (Lampetra and Myxine) provides a framework for the interpretation of the anatomy of soft-bodied fossil vertebrates and putative cyclostomes, and a context for reading the fossil record of non-biomineralized vertebrates.

Head and backbone of the Early Cambrian vertebrate Haikouichthys

Phylogenetic analysis indicates that Haikouichthys somewhat resembles the ammocoete larva of modern lampreys, this is because of shared general craniate characters; adult lampreys and hagfishes (the cyclostomes if monophyletic) are probably derived in many respects.

A lamprey from the Cretaceous Jehol biota of China

A freshwater lamprey from the Early Cretaceous epoch (about 125 million years ago) of Inner Mongolia, China is reported, indicating Mesomyzon's closer relationship to extant lampreys but also revealing the group's invasion into a freshwater environment no later than the EarlyCretaceous.
...