Cypriniformes

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Cypriniformes
Temporal range: Paleocene–recent
A wild-type
common carp (Cyprinus carpio, Cyprinidae: Cyprininae
)
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
(unranked):
Otophysi
(unranked):
Cypriniphysae
Order: Cypriniformes
Bleeker, 1859
Type species
Cyprinus carpio
)
Families[4]

Acheilognathidae[1]

Balitoridae

Barbuccidae[2]
Botiidae[2]
Catostomidae
Cobitidae
Cyprinidae
Danionidae[1]

Ellopostomatidae[2]

Gastromyzontidae[2]
Gobionidae[1]

Gyrinocheilidae

†
Jianghanichthyidae[3]

Leptobarbidae[1]

Leuciscidae[1]

Nemacheilidae
Paedocyprididae[1]

Psilorhynchidae

Serpenticobitidae[2]

Sundadanionidae[1]

Tanichthyidae[1]

Tincidae[1]

Vaillantellidae[2]

Xenocyprididae[1]

and see text

Diversity
Around 4,205 species

Cypriniformes

superorder Ostariophysi—which is also made up of cyprinid, ostariophysin fishes. The order contains 11-12 families (with some authorities having listed as many as 23),[5] over 400 genera, and more than 4,250 named species; new species are regularly described, and new genera are recognized frequently.[4][6] Cyprinids are most diverse in South and Southeast Asia, but are entirely absent from Australia and South America.[7] At 112 years old, the longest-lived cypriniform fish documented is the bigmouth buffalo.[8]

Their closest living relatives are the

characins, tetras and their kin), the Gymnotiformes (electric eel and American knifefishes), and the Siluriformes (catfishes).[9]

Description

Like other orders of the

adipose fin behind the dorsal fin. Further differences are the Cypriniformes' unique kinethmoid, a small median bone in the snout, and the lack of teeth in the mouth. Instead, they have convergent structures called pharyngeal teeth in the throat. While other groups of fish, such as cichlids, also possess pharyngeal teeth, the cypriniformes' teeth grind against a chewing pad on the base of the skull, instead of an upper pharyngeal jaw.[7]

A true loach - the spined loach, Cobitis taenia

The most notable family placed here is the

anadromous,[citation needed] swimming upstream into rivers to spawn. Sometimes separated as family Psilorhynchidae, they seem to be specially adapted fishes of the Cyprinidae.[11]

The

temperate North America and eastern Asia.[citation needed] These large fishes are similar to carps in appearance and ecology. Members of the Cobitidae are common across Eurasia and parts of North Africa.[citation needed] A midsized group like the suckers,[13] they are rather similar to catfish in appearance and behaviour, feeding primarily off the substrate and equipped with barbels to help them locate food at night or in murky conditions. Fishes in the families Cobitidae, Balitoridae, Botiidae, and Gyrinocheilidae are called loaches, although the last do not seem to belong to the lineage of "true" loaches, but are related to the suckers.[14]

Systematics

Nemacheilus chrysolaimos is a stone loach. Closely related to true loaches, like these, they have barbels.
The Chinese algae eater (Gyrinocheilus aymonieri) is one of the sucking loaches, which are distant from other "loaches".
Erimyzon sucetta
, a small sucker

Historically, these included all the forms now placed in the

characins and allies), and Gymnotiformes (knifefishes and electric eels) have been separated out to form their own monophyletic orders.[15]

The

Vaillantellidae).[2]

ecomorphologically conservative main lineage apparently at least two major radiations branched off. These diversified from the lowlands into torrential river habitats, acquiring similar habitus and adaptations in the process.[14]

The mountain carps are the highly apomorphic Cyprinidae, perhaps close to true carps (Cyprininae), or maybe to the danionins. While some details about the phylogenetic structures of this massively diverse family are known – e.g. that Cultrinae and Leuciscinae are rather close relatives and stand apart from Cyprininae – no good consensus exists yet on how the main lineages are interrelated. A systematic list, from the most ancient to the most modern lineages, can thus be given as:[1]

Phylogeny

Phylogeny based on the work of the following works[16][17][18][19][20]

Cypriniformes
Cyprinoidei
Cyprinoidea

Cyprinidae (carps & minnows)

Psilorhynchidae

Cobitoidei
Catostomoidea (suckers)

Catostomidae

Gyrinocheiloidea

Gyrinocheilidae

Cobitoidea
 (loaches)

Botiidae

Vaillantellidae

Cobitidae

Balitoridae

Ellopostomatidae

Nemacheilidae

Evolution

Cypriniformes include the most primitive of the Ostariophysi in the narrow sense (i.e. excluding the

mya).[21] However, their divergence probably occurred only with the splitting-up of Pangaea in the Jurassic, maybe 160 million years ago (Mya). By 110 Mya, the plate tectonics evidence indicates that the Laurasian Cypriniformes must have been distinct from their Gondwanan relatives.[22]

The Cypriniformes are thought to have originated in

otophysans. If this were the case, they would have spread to Asia through Africa or North America before the continents split up, for these are purely freshwater fishes. As the Characiformes began to diversify and spread, they may have outcompeted South American basal cypriniforms in Africa, where more advanced cypriniforms survive and coexist with characiforms.[23]

The earliest cypriniform fossils are already assignable to the living

Jianghanichthyidae is known from the Eocene of China.[3] In the Oligocene, around 30 Mya, advanced cyprinids began to outcompete catostomids wherever they were sympatric, causing a decline of the suckers. Cyprinids reached North America and Europe about the same time, and Africa in the early Miocene (some 23-20 Mya). The cypriniforms spread to North America through the Bering land bridge, which formed and disappeared again several times during the many millions of years of cypriniform evolution.[23]

Relationship with humans

The Cyprinidae in particular are important in a variety of ways. Many species are important food fish, particularly in Europe and Asia. Some are also important as aquarium fish, of which the goldfish and koi are perhaps the most celebrated. The other families are of less commercial importance. The Catostomidae have some importance in angling, and some "loaches" are bred for the international aquarium fish trade.

Accidentally or deliberately introduced populations of

common carp (Cyprinus carpio) and grass carp (Ctenopharyngodon idella) are found on all continents except Antarctica. In some cases, these exotic species have a negative impact on the environment. Carp in particular stir up the riverbed, reducing the clarity of the water, making plant growth difficult.[25]

In science, one of the most famous members of the Cypriniformes is the zebrafish (Danio rerio). The zebrafish is one of the most important vertebrate model organisms in biological and biochemical sciences, being used in many kinds of experiments. During early development, the zebrafish has a nearly transparent body, so it is ideal for studying developmental biology. It is also used for the elucidation of biochemical signaling pathways.[26] They are also good pets, but can be shy in bright light and crowded tanks.

Threats and extinction

extinct
since about 1960.

extinction or even beyond. In particular, Cyprinidae of southwestern North America have been severely affected; a considerable number went entirely extinct after settlement by Europeans. For example, in 1900 the thicktail chub (Gila crassicauda) was the most common freshwater fish found in California
; 70 years later, not a single living individual existed.

Few if any red-tailed black sharks (Epalzeorhynchos bicolor) remain in the wild today.

The well-known

Yarqon River had to be rescued into captivity from imminent extinction; new populations have apparently been established again successfully from captive stock. The Balitoridae and Cobitidae, meanwhile, contain a very large number of species about which essentially nothing is known except how they look and where they were first found.[27]

Globally extinct Cypriniformes species are:[27]

Notes

  1. ^ a b c d e f g h i j k Tan & Armbruster (2018)
  2. ^ a b c d e f g Kottelat, M. (2012)
  3. ^
    ISSN 0272-4634
    .
  4. ^ a b Froese, Rainer, and Daniel Pauly, eds. (2012). "Cypriniformes" in FishBase. December 2012 version.
  5. S2CID 52976511
    .
  6. ^ Eschmeyer, W.N., Fong, J.D. (2015) Species by family/subfamily in the Catalog of Fishes, California Academy of Sciences (retrieved 2 July 2015)
  7. ^ a b c d Nelson (2006)
  8. PMID 31149641
    .
  9. ^ Saitoh et al. (2003), Briggs (2005)
  10. ^ Orlov & Sa-a {2007]
  11. ^ FishBase (2004d,f), He et al. (2008)
  12. ^ FishBase (2004a,e)
  13. ^ FishBase (2004b,c)
  14. ^ a b He et al. (2008)
  15. ^ Helfman et al. (1997): pp.228-229
  16. PMID 17433724
    .
  17. PMID 20738682
    .
  18. ^ Jörg Bohlen, Vendula Šlechtová: Phylogenetic position of the fish genus Ellopostoma (Teleostei: Cypriniformes) using molecular genetic data. Ichthyological Exploration of Freshwaters. Bd. 20, Nr. 2, 2009, S. 157-162 (PDF Archived 24 September 2015 at the Wayback Machine; 1,8 MB)
  19. ^ Mikko Haaramo. "Cobitoidei – loach-like cypriniforms". Mikko's Phylogeny Archive. Retrieved 26 October 2013.
  20. ^ "ITIS Standard Report Page: Cyprinoidea". www.itis.gov. Retrieved 26 July 2019.
  21. ^ Saitoh et al. (2003)
  22. ^ Briggs (2005), Nelson (2006)
  23. ^ a b Briggs (2005)
  24. ISSN 0272-4634
    .
  25. ^ GSMFC (2005), FFWCC [2008]
  26. ^ "Biochemical Signaling Pathways". ZFIN.
  27. ^ a b IUCN (2007)

References

External links

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