Ginglymodi

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Ginglymodi
Temporal range: Middle Triassic (Anisian)–present
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Possible Permian records
Kaimanfisch (Lepisosteus oculatus).jpg
Spotted gar (Lepisosteus oculatus)
Macrosemimimus fegerti.jpg
Macrosemimimus fegerti (Semionotiformes) from the Upper Jurassic of Germany
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Infraclass: Holostei
Clade: Ginglymodi
Cope, 1871
Subgroups

Ginglymodi is a clade of ray-finned fish containing modern-day gars (Lepisosteidae) and their extinct relatives (including the family Lepidotidae) in the order Lepisosteiformes, the extinct orders Semionotiformes and Kyphosichthyiformes, and various other extinct taxa. Ginglymodi is one of the two major subgroups of the infraclass Holostei, the other one being Halecomorphi, which contains the bowfin and eyespot bowfin and their fossil relatives. [1] [2]

Contents

Fossil record

The fossil record of ginglymodians goes back at least to the Anisian stage of the Triassic period, over 240 million years ago. [3] Eosemionotus is one of the earliest ginglymodians. Acentrophorus , another taxon from the Middle and Late Permian, and Paracentrophorus from the Early Triassic epoch, could be even earlier members of the group. Ginglymodi was diverse and widespread during the Mesozoic era, but they represent a depauperate lineage today. The group first evolved in marine environments, but several lineages made separate transitions into freshwater environments. [4] The basal ginglymodian order Kyphosichthyiformes is known from a few genera from the Triassic of China, many of which have deep bodies. [5]

Ginglymodi underwent substantial diversification during the Late Triassic and the Late Jurassic, with the Lepisosteiformes and Semionotiformes having likely diverged during the Middle Triassic. [6] Early non-gar ginglymodians of all groups, but especially early lepisosteiforms, show heavy morphological convergence with modern cypriniforms (carp and relatives), suggesting that they may have had a similar ecological niche. Notably, molecular evidence suggests that the cypriniforms may have originated and diversified around the same time and place (Late Jurassic and Early Cretaceous Southeast Asia) that the similar freshwater ginglymodians showed major diversification. [7] Eventually, some ginglymodians evolved a more predatory lifestyle, with the earliest known true gars from the Late Jurassic. [8] Ginglymodians underwent a major decline during the mid-Cretaceous, eventually leaving gars as the only surviving members of the group. [6] Gar fossils have been found on all continents except Australia and Antarctica. Only seven species exist today, distributed in the freshwater systems of North America. [8]

Phylogeny

Phylogenetic relationships of Ginglymodi to other living neopterygian fish.

Neopterygii

Teleostei Common carp (white background).jpg

Holostei

Halecomorphi (bowfin, eyespot bowfin and their fossil relatives) Amia calva (white background).jpg

Ginglymodi (gars and their fossil relatives) Alligator gar fish (white background).jpg

Phylogenetic relationships among different groups of ginglymodians (cladogram after Xu & Ma 2023): [9]

Ginglymodi

References

  1. 1 2 López-Arbarello, A.; Sferco, E. (2018). "Neopterygian phylogeny: the merger assay". Royal Society Open Science. 5 (3): 172337. Bibcode:2018RSOS....572337L. doi: 10.1098/rsos.172337 . PMC   5882744 . PMID   29657820.
  2. ↑ Nelson, Joseph S. (2016). Fishes of the World. John Wiley & Sons, Inc. ISBN   978-1-118-34233-6.
  3. ↑ Romano, Carlo (2021). "A Hiatus Obscures the Early Evolution of Modern Lineages of Bony Fishes". Frontiers in Earth Science. 8: 672. doi: 10.3389/feart.2020.618853 . ISSN   2296-6463.
  4. ↑ Cavin, Lionel; Deesri, Uthumporn; Olive, Sébastien (2019-07-22). "Scheenstia bernissartensis (Actinopterygii: Ginglymodi) from the Early Cretaceous of Bernissart, Belgium, with an appraisal of ginglymodian evolutionary history" . Journal of Systematic Palaeontology. 18 (6): 513–527. doi:10.1080/14772019.2019.1634649. ISSN   1477-2019. S2CID   199631685.
  5. ↑ Xu, G.; Ma, X.; Wu, F.; Ren, Y. (2019). "A Middle Triassic kyphosichthyiform from Yunnan, China, and phylogenetic reassessment of early ginglymodians". Vertebrata PalAsiatica. 57 (3): 181–204. doi:10.19615/j.cnki.1000-3118.190319.
  6. 1 2 Cawley, John J.; Marramà, Giuseppe; Carnevale, Giorgio; Villafaña, Jaime A.; López‐Romero, Faviel A.; Kriwet, Jürgen (February 2021). "Rise and fall of †Pycnodontiformes: Diversity, competition and extinction of a successful fish clade". Ecology and Evolution. 11 (4): 1769–1796. doi:10.1002/ece3.7168. ISSN   2045-7758. PMC   7882952 . PMID   33614003.
  7. ↑ Deesri, Uthumporn; Jintasakul, Pratueng; Cavin, Lionel (2016-10-07). "A new Ginglymodi (Actinopterygii, Holostei) from the Late Jurassic–Early Cretaceous of Thailand, with comments on the early diversification of Lepisosteiformes in Southeast Asia" . Journal of Vertebrate Paleontology. 36 (6): e1225747. doi:10.1080/02724634.2016.1225747. ISSN   0272-4634. S2CID   89359438.
  8. 1 2 Paulo M. Brito; Jésus Alvarado-Ortega; François J. Meunier (2017). "Earliest known lepisosteoid extends the range of anatomically modern gars to the Late Jurassic". Scientific Reports. 7 (1): Article number 17830. Bibcode:2017NatSR...717830B. doi:10.1038/s41598-017-17984-w. PMC   5736718 . PMID   29259200.
  9. ↑ Xu, Guang-Hui; Ma, Xin-Ying (2023-10-16). "A new basal ginglymodian fish (Holostei: Neopterygii) from the Middle Triassic (Anisian) Luoping Biota, Yunnan, China" . Zoological Journal of the Linnean Society. doi:10.1093/zoolinnean/zlad144. ISSN   0024-4082.


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