Halecostomi

{{Short description|Group of ray-finned fishes}}

{{Automatic taxobox

| image = Amia calva 1908.jpg

| image_caption = Amia calva (bowfin)

| image2 = Hiodon tergisus NOAA.jpg

| image2_caption = Hiodon tergisus

| taxon = Halecostomi

| authority = Regan, 1903

| subdivision_ranks = Subdivisions

| subdivision =

• Halecomorphi
• Teleostei

}}

{{Portal|fish}}

Halecostomi is the name of a group of neopterygian fish uniting the halecomorphs (represented by the living bowfin and many extinct groups) and the teleosts, the largest group of extant ray-finned fish.Patterson C. Interrelationships of holosteans. In: Greenwood P H, Miles R S, Patterson C, eds. Interrelationships of Fishes. Zool J Linn Soc, 1973, 53(Suppl): 233–305

File:Cladogram of basal actinopterygians and neopterygians.png proposing a sister group relationship between Amiiformes (Halecomorphi) and Teleostei]]

The Halecostomi hypothesis and the Holostei hypothesis are two competing hypotheses explaining the evolutionary relationships of living ray-finned fish. The Holostei hypothesis is better supported, rendering the Halecostomi a paraphyletic group (i.e., rejecting the Halecostomi hypothesis).{{cite journal|last=Grande|first=Lance|author2=Bemis, William E.|title=A Comprehensive Phylogenetic Study of Amiid Fishes (Amiidae) Based on Comparative Skeletal Anatomy. an Empirical Search for Interconnected Patterns of Natural History|journal=Journal of Vertebrate Paleontology|year=1998|volume=18|issue=sup001|pages=1–696|doi=10.1080/02724634.1998.10011114|bibcode=1998JVPal..18S...1G }}{{cite journal |last1=López-Arbarello |first1=Adriana |last2=Sferco |first2=Emilia |title=Neopterygian phylogeny: the merger assay. |journal=Royal Society Open Science |date=March 2018 |volume=5 |issue=3 |pages=172337 |doi=10.1098/rsos.172337|pmid=29657820 |pmc=5882744 |bibcode=2018RSOS....572337L |doi-access=free }}{{cite web | author = Betancur-R | title = Phylogenetic Classification of Bony Fishes Version 4 | url = https://sites.google.com/site/guilleorti/classification-v-4 | date = 2016 | access-date = 2021-06-06 | archive-date = 2017-07-11 | archive-url = https://web.archive.org/web/20170711171156/https://sites.google.com/site/guilleorti/classification-v-4 | url-status = dead }}{{cite book| last = Nelson| first = Joseph, S.| title = Fishes of the World| year = 2016| publisher = John Wiley & Sons, Inc| isbn = 978-1-118-34233-6 }}

The Holostei hypothesis posits that Ginglymodi (gars and their fossil relatives) and Halecomorphi form a clade, called Holostei, and that the Holostei are the sister group to the Teleostei.

{{clade| style=font-size:100%;line-height:100%;

| label1=Neopterygii

| 1={{clade

|label1=Holostei

|1={{clade

|1=Ginglymodi (gars and their fossil relatives) 130px

|2=Halecomorphi (bowfin and its fossil relatives) 130px

}}

|2=Teleostei 130px

}} }}