Biology:Teleosteomorpha

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Teleosteomorpha is an infraclass of ray-finned fishes containing all teleost fish and their closest extinct relatives.[1] Also in this group are two diverse Mesozoic fish orders, the Aspidorhynchiformes and the Pachycormiformes.[2] Several other non-teleostomorph teleosteans existed throughout the Mesozoic, although not as dominant as the two main clades in the group.

Shared morphological features of this group include a autosphenotic bone lacking a dermal component, the lack of a canal bearing part of the antorbital bone, the lack of vertebral centra fused into the occipital condyle in adult individuals, and each hypural (caudal fin support) being articulated with caudal rays.[3]

The oldest known teleosteomorph is Prohalecites from the Triassic of Italy.[2] The last surviving non-teleostean teleosteomorph was Belonostomus, which survived into the Late Paleocene.

Taxonomy

Cladogram of Teleosteomorpha after Sferco et al. 2015:[4]

 

Holostei

 
Teleosteomorpha
 

Pachycormiformes

 
 
 

Aspidorhynchiformes

 
 

Mesturus

 
 
 

Pholidophoridae

 
 
 

Siemensichythys

 
 
 

Dorsetichthys

 
 
 

Eurycormus

 
 
 

Leptolepidae

 
 
 

Luisiellidae

 
 
 

Tharsis dubius

 
 
 

Varasichthyidae

 
 
 

Ascalabos

 
 
 

Ichthyodectiformes

 
 

Teleostei crown group (including Crossognathiformes)

 
 
 
 
 
 
 
 
 
 
 
 
(Teleostei total group)

The cladogram below is simplified after a phylogenetic analysis by Bean (2021).[5]

Teleosteomorpha
 

Pachycormidae

 
 
 

Aspidorhynchidae

 
Teleostei
 

Archaeomaenidae

 
 
 

Pholidophoridae

 
 
 

Prohalecites

 
 
 

Eurycormus

 
 
 

Ankylophoridae

 
 
 

Ichthyokentema

 
 
 

Dorsetichthys

 
 
 

Leptolepis

 
 
 

Ascalaboidae

 
 
 

Varasichthyidae

 
 

Crown group Teleostei

 
 
 
 
 
 
 
 
 
 
 
 
 
Teleosteomorpha contains both the smallest (Paedocypris progenetica, above) and the largest (Leedsichthys problematicus, below) known ray-finned fish to have ever existed.

Where applicable, taxonomic order is based on Eschmeyer's Catalog of Fishes:[6]

References

  1. ↑ Arratia, Gloria (2001-12-14). "The sister-group of Teleostei: consensus and disagreements" (in en). Journal of Vertebrate Paleontology 21 (4): 767–773. doi:10.1671/0272-4634(2001)021[0767:TSGOTC2.0.CO;2]. ISSN 0272-4634. http://www.tandfonline.com/doi/abs/10.1671/0272-4634%282001%29021%5B0767%3ATSGOTC%5D2.0.CO%3B2. 
  2. ↑ 2.0 2.1 Nelson, Joseph S.; Grande, Terry C.; Wilson, Mark V. H. (2016-02-22). Fishes of the World. Wiley. doi:10.1002/9781119174844. ISBN 978-1-118-34233-6. 
  3. ↑ Arratia, Gloria (2017-03-04). "New Triassic teleosts (Actinopterygii, Teleosteomorpha) from northern Italy and their phylogenetic relationships among the most basal teleosts" (in en). Journal of Vertebrate Paleontology 37 (2). doi:10.1080/02724634.2017.1312690. ISSN 0272-4634. Bibcode: 2017JVPal..37E2690A. https://www.tandfonline.com/doi/full/10.1080/02724634.2017.1312690. 
  4. ↑ Sferco, Emilia; López-Arbarello, Adriana; Báez, Ana María (December 2015). "Phylogenetic relationships of †Luisiella feruglioi (Bordas) and the recognition of a new clade of freshwater teleosts from the Jurassic of Gondwana" (in en). BMC Evolutionary Biology 15 (1): 268. doi:10.1186/s12862-015-0551-6. ISSN 1471-2148. PMID 26630925. Bibcode: 2015BMCEE..15..268S. 
  5. ↑ Bean, L. B. (2021). "Revision of the Mesozoic freshwater fish clade Archaeomaenidae". Alcheringa: An Australasian Journal of Palaeontology 45 (2): 217–259. doi:10.1080/03115518.2021.1937700. https://www.researchgate.net/publication/353450210. 
  6. ↑ Fricke, R.; Eschmeyer, W. N.; Van der Laan, R. (2025). "ESCHMEYER'S CATALOG OF FISHES: CLASSIFICATION" (in en). https://www.calacademy.org/eschmeyers-catalog-of-fishes-classification. 
  7. ↑ 7.0 7.1 Arratia, G.; Schultze, H.-P. (2024). "The oldest teleosts (Teleosteomorpha): their early taxonomic, phenotypic, and ecological diversification during the Triassic". Fossil Record 27 (1): 29–53. doi:10.3897/fr.27.115970. Bibcode: 2024FossR..27...29A. 
  8. ↑ Schultze, Hans-Peter; Arratia, Gloria; Hauschke, Norbert; Wilde, Volker (2022). "Osteichthyan Fishes from the uppermost Norian (Triassic) of the Fuchsberg near Seinstedt, Lower Saxony (Germany)" (in en). Diversity 14 (11): 901. doi:10.3390/d14110901. ISSN 1424-2818. 
  9. ↑ 9.0 9.1 Sferco, Emilia; López-Arbarello, Adriana; Báez, Ana María (2015-12-03). "Phylogenetic relationships of †Luisiella feruglioi (Bordas) and the recognition of a new clade of freshwater teleosts from the Jurassic of Gondwana". BMC Evolutionary Biology 15 (1): 268. doi:10.1186/s12862-015-0551-6. ISSN 1471-2148. PMID 26630925. Bibcode: 2015BMCEE..15..268S. 
  10. ↑ In ITIS, Syngnathiformes is placed as the suborder Syngnathoidei of the order Gasterosteiformes.
  11. ↑ In ITIS, Gobiesociformes is placed as the suborder Gobiesocoidei of the order Perciformes.

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