Ginglymodi
Temporal range: Possible Late Permian records
Spotted gar (Lepisosteus oculatus)
Macrosemimimus fegerti (Semionotiformes) from the Upper Jurassic of Germany
Scientific classification Edit this classification
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) & 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]

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 Wuchiapingian stage of the 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
Holostei

Ginglymodi (gars and their fossil relatives)

Halecomorphi (bowfin, eyespot bowfin and their fossil relatives)

Teleostei

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

Ginglymodi

†Diandongichthys

†Ticinolepis

†Kyphosichthyiformes

Fuyuanichthys

Kyphosichthys

Yudaiichthys

Lashanichthys

†Sangiorgioichthys

†Semionotiformes

Lepisosteiformes

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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