Overview
Gasterosteiformes is an order of ray-finned fishes that includes the sticklebacks and relatives.
In the Gasterosteiformes, the pelvic girdle is never attached to the directly, and the supramaxillary, orbitosphenoid, and basisphenoid bones are absent. The body is often partly or completely covered with dermal plates.
The name "Gasterosteiformes" means "bone-bellies". It is derived from Ancient Greek gaster (?ast??; "stomach", "abdomen") + ostoun (?st???; "bone"). The ending for fish orders "-formes" is derived from Latin and indicates "of similar form".
Often Gasterosteiformes includes the sea horses, pipefishes and their relatives as suborder Syngnathoidei, with the sticklebacks and relatives in the suborder Gasterosteoidei.[1] In many more recent treatments the traditional placement[2] as different orders, with the former becoming Syngnathiformes, is used.[3] There is a growing body of evidence that this is correct; in fact, the two groups do not seem to be particularly close relatives among the Acanthopterygii.
As it seems, the loosely delimited Gasterosteiformes are paraphyletic with the Scorpaeniformes. The more typical members of that group (e.g. scorpionfishes) are apparently closer to the "true" Gasterosteiformes, whereas the keel-bodied flying gurnards (Dactylopteridae) seem actually to belong to the Syngnathiformes clade. It seems that the closest living relatives of the narrowly-delimited Gasterosteiformes are the gunnels (Pholidae) and eelpouts (Zoarcidae), traditionally placed in the massively paraphyletic "Perciformes". These two families, as well as the related Trichodontidae, would then appear to be derived offshoots of the scorpaeniform-gasterosteiform radiation which have apomorphically lost the bone "armour" found in their relatives.[4]
Three families certainly belong to the Gasterosteiformes sensu stricto:
- Aulorhynchidae ? tube-snouts
- Gasterosteidae ? sticklebacks
- Hypoptychidae ? the Sand Eel
- Indostomidae ? armoured sticklebacks
The armoured sticklebacks (Indostomidae) and the dragonfishes and sea moths (Pegasidae) are variously placed with the pipefish or the stickleback lineage. While the Pegasidae are almost certainly Syngnathiformes, the placement of the monotypic former family is essentially unresolved, as it has always been.[4] Following the practice of the major fish classification organizations, it is included here.
Timeline of genera

Footnotes
In the Gasterosteiformes, the pelvic girdle is never attached to the directly, and the supramaxillary, orbitosphenoid, and basisphenoid bones are absent. The body is often partly or completely covered with dermal plates.
The name "Gasterosteiformes" means "bone-bellies". It is derived from Ancient Greek gaster (?ast??; "stomach", "abdomen") + ostoun (?st???; "bone"). The ending for fish orders "-formes" is derived from Latin and indicates "of similar form".
Often Gasterosteiformes includes the sea horses, pipefishes and their relatives as suborder Syngnathoidei, with the sticklebacks and relatives in the suborder Gasterosteoidei.[1] In many more recent treatments the traditional placement[2] as different orders, with the former becoming Syngnathiformes, is used.[3] There is a growing body of evidence that this is correct; in fact, the two groups do not seem to be particularly close relatives among the Acanthopterygii.
As it seems, the loosely delimited Gasterosteiformes are paraphyletic with the Scorpaeniformes. The more typical members of that group (e.g. scorpionfishes) are apparently closer to the "true" Gasterosteiformes, whereas the keel-bodied flying gurnards (Dactylopteridae) seem actually to belong to the Syngnathiformes clade. It seems that the closest living relatives of the narrowly-delimited Gasterosteiformes are the gunnels (Pholidae) and eelpouts (Zoarcidae), traditionally placed in the massively paraphyletic "Perciformes". These two families, as well as the related Trichodontidae, would then appear to be derived offshoots of the scorpaeniform-gasterosteiform radiation which have apomorphically lost the bone "armour" found in their relatives.[4]
Three families certainly belong to the Gasterosteiformes sensu stricto:
- Aulorhynchidae ? tube-snouts
- Gasterosteidae ? sticklebacks
- Hypoptychidae ? the Sand Eel
- Indostomidae ? armoured sticklebacks
The armoured sticklebacks (Indostomidae) and the dragonfishes and sea moths (Pegasidae) are variously placed with the pipefish or the stickleback lineage. While the Pegasidae are almost certainly Syngnathiformes, the placement of the monotypic former family is essentially unresolved, as it has always been.[4] Following the practice of the major fish classification organizations, it is included here.
Timeline of genera

Footnotes
References
- FishBase (2005a): Order Summary for Gasterosteiformes. Version of 2005-FEB-15. Retrieved 2008-AUG-19.
- FishBase (2005b): Order Summary for Syngnathiformes. Version of 2005-FEB-15. Retrieved 2008-AUG-19.
- Integrated Taxonomic Information System (ITIS) (2004): Gasterosteiformes (TSN 166361). Retrieved 2006-APR-08
- Kaw ahara, Ryouka; Miya, Masaki; Mabuchi, Kohji; Lavoue, S?bastien; Inoue, Jun G.; Satoh, Takashi P.; Kawaguchi, Akira & Nishida, Mutsumi (2008): Interrelationships of the 11 gasterosteiform families (sticklebacks, pipefishes, and their relatives): A new perspective based on mitogenome sequences from 75 higher teleosts. Mol. Phylogenet. Evol. 46(1): 224?236. doi:10.1016/j.ympev.2007.07.009 (HTML abstract)
- McAllister, D.E. (1968): Evolution of branchiostegals and classification of teleostome fishes. Bulletin of the National Museum of Canada, Ottawa 221: 1?239.
- Nelson, Joseph S. (2006): Fishes of the World. John Wiley & Sons, Inc. ISBN 0471250317
- Sepkoski, Jack (2002). "A compendium of fossil marine animal genera". Bulletins of American Paleontology 364: p.560. http://strata.ummp.lsa.umich.edu/jack/showgenera.php?taxon=611&rank=class. Retrieved 2011-05-17.
External links
- Gasterosteiformes entry on Animal Diversity Web
Taxonomy
The Order Gasterosteiformes is further organized into finer groupings including:
- Family (7): Aulorhynchidae · Gasterosteidae · Hypoptychidae · Indostomidae · Macroramphosidae · Macrorhamphosidae · Pegasidae
- Species: ZipcodeZoo has pages for 158 species and subspecies in the Order Gasterosteiformes.
Families
Aulorhynchidae
The tube-snouts are a family, the Aulorhynchidae, of fish related to the sticklebacks. There are only two species in the family, each placed in its own genus. Both are found in shallow marine waters, with one living off the west coast of North America, and the other off the coast of Japan. [more]
Gasterosteidae
The Gasterosteidae are a family of fish including the sticklebacks. FishBase currently recognises sixteen species in the family, grouped in five genera. However several of the species have a number of recognised subspecies, and the taxonomy of the family is thought to be in need of revision. Although some authorities give the common name of the family as "sticklebacks and tube-snouts", the tube-snouts are currently classified in the related family Aulorhynchidae. [more]
Hypoptychidae
Hypoptychus dybowskii is a fish, one of several commonly known as a sand eel, that is the only member of its genus and family. It is related to sticklebacks, and lives in shallow salt water off the coasts of Japan and Sakhalin (Russia). [more]
Indostomidae
Indostomus is sole genus in the family of fishes Indostomidae and contains only three species. The indostomids are small, tropical fish in the stickleback order Gasterosteiformes, and are closely related to seahorses and pipefishes. [more]
Macroramphosidae
Centriscidae is the family of snipefishes, shrimpfishes, and bellowfishes. A small family, consisting of only about a dozen marine species, they are of an unusual appearance, as reflected by the common names. The members of the genera Aeoliscus and Centriscus are restricted to relatively shallow, tropical parts of the Indo-Pacific, while the remaining species mainly are found in deeper parts of tropical, subtropical or southern oceans. [more]
Macrorhamphosidae
Pegasidae
The seamoths are a family, the Pegasidae, of fish found in coastal tropical waters. [more]
At least 15 species and subspecies belong to the Family Pegasidae.
More info about the Family Pegasidae may be found here.
References
- FishBase (2005a): Order Summary for Gasterosteiformes. Version of 2005-FEB-15. Retrieved 2008-AUG-19.
- FishBase (2005b): Order Summary for Syngnathiformes. Version of 2005-FEB-15. Retrieved 2008-AUG-19.
- Integrated Taxonomic Information System (ITIS) (2004): Gasterosteiformes (TSN 166361). Retrieved 2006-APR-08
- Kawahara, Ryouka; Miya, Masaki; Mabuchi, Kohji; Lavoue, S?bastien; Inoue, Jun G.; Satoh, Takashi P.; Kawaguchi, Akira & Nishida, Mutsumi (2008): Interrelationships of the 11 gasterosteiform families (sticklebacks, pipefishes, and their relatives): A new perspective based on mitogenome sequences from 75 higher teleosts. Mol. Phylogenet. Evol. 46(1): 224?236. doi:10.1016/j.ympev.2007.07.009 (HTML abstract)
- McAllister, D.E. (1968): Evolution of branchiostegals and classification of teleostome fishes. Bulletin of the National Museum of Canada, Ottawa 221: 1?239.
- Nelson, Joseph S. (2006): Fishes of the World. John Wiley & Sons, Inc. ISBN 0471250317
- Sepkoski, Jack (2002). "A compendium of fossil marine animal genera". Bulletins of American Paleontology 364: p.560. http://strata.ummp.lsa.umich.edu/jack/showgenera.php?taxon=611&rank=class. Retrieved 2011-05-17.
External links
- Gasterosteiformes entry on Animal Diversity Web
Footnotes
- ^ E.g. ITIS (2004), Nelson (2006)
- ^ E.g. McAllister (1968)
- ^ E.g. FishBase (2005a,b)
- ^ a b Kawahara (2008)
Sources
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