The longfins, also known as roundheads or spiny basslets, are a

family Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ...

, Plesiopidae, which were formerly placed in the order

Perciformes Perciformes (), also called the Acanthopteri, is an order or superorder of ray-finned fish in the clade Percomorpha. ''Perciformes'' means " perch-like". Among the well-known members of this group are perches and darters ( Percidae), and als ...

or considered indeterminate percomorphs, but are now considered basal blenniiforms. They are elongated fishes, found in the

Indian Ocean The Indian Ocean is the third-largest of the world's five oceanic divisions, covering or approximately 20% of the water area of Earth#Surface, Earth's surface. It is bounded by Asia to the north, Africa to the west and Australia (continent), ...

and western

Pacific Ocean The Pacific Ocean is the largest and deepest of Earth's five Borders of the oceans, oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean, or, depending on the definition, to Antarctica in the south, and is ...

Classification

In some classifications, the genus ''

Notograptus ''Notograptus'' is a genus of marine fish in subclass Actinopterygii and order Perciformes. They are sometimes placed in the monotypic family Notograptidae, or may instead be included in the family Plesiopidae. ''Notograptus'' supposedly bears a ...

'' is split in its own family,

Notograptidae ''Notograptus'' is a genus of marine fish in subclass Actinopterygii and order Perciformes. They are sometimes placed in the monotypic family Notograptidae, or may instead be included in the family Plesiopidae. ''Notograptus'' supposedly bears a ...

, but

FishBase FishBase is a global species database of fish species (specifically finfish). It is the largest and most extensively accessed online database on adult finfish on the web.

is followed here. There are two

subfamilies In biological classification, a subfamily (Latin: ', plural ') is an auxiliary (intermediate) taxonomic rank, next below family but more inclusive than genus. Standard nomenclature rules end botanical subfamily names with "-oideae", and zool ...

within the Plesiopidae and the genera are as follows: *Subfamily Acanthoclininae Günther, 1861 ** Genus ''

Acanthoclinus ''Acanthoclinus'' is a genus of roundheads of the family Plesiopidae. They are elongated in shape with large mouths and eyes, and are found in the oceans around New Zealand. The species in the genus include: * '' Acanthoclinus fuscus'' Jenyns, 184 ...

'' Jenyns, 1841 ** Genus ''

Acanthoplesiops ''Acanthoplesiops'' is a genus of reef-dwelling fishes belonging to the family Plesiopidae. All species are very small, with the largest specimen recorded only reaching 27 mm fish measurement, standard length. They have several features whic ...

'' Regan, 1912 ** Genus '' Beliops''

Hardy Hardy may refer to: People * Hardy (surname) * Hardy (given name) * Hardy (singer), American singer-songwriter Places Antarctica * Mount Hardy, Enderby Land * Hardy Cove, Greenwich Island * Hardy Rocks, Biscoe Islands Australia * Hardy, ...

, 1985 ** Genus ''

Belonepterygion The barred spiny basslet (''Belonepterygion fasciolatum'') is a species of ray-finned fish in the family Plesiopidae, the longfins or roundheads. It occurs on reefs in the western Pacific Ocean from Japan south to Australia and east to New Caledo ...

'' McCulloch, 1915 ** Genus ''

'' Günther, 1867 * Subfamily Plesiopinae Günther, 1861 ** Genus '' Assessor'' Whitley, 1935 ** Genus ''

Calloplesiops ''Calloplesiops'' is a genus of ray-finned fish from the family Plesiopidae, the longfins or roundheads. They are found in the Indo-Pacific. Species There are two species currently recognised in the genus ''Calloplesiops'': * '' Calloplesiops ...

'' Fowler and

Bean A bean is the seed of some plants in the legume family (Fabaceae) used as a vegetable for human consumption or animal feed. The seeds are often preserved through drying (a ''pulse''), but fresh beans are also sold. Dried beans are traditi ...

, 1930 ** Genus ''

Fraudella The carp prettyfin (''Fraudella carassiops'') is a species of ray-finned fish from the family Plesiopidae, the longfins or roundheads. It is endemic Endemism is the state of a species being found only in a single defined geographic locatio ...

'' Whitley, 1935 ** Genus ''

Paraplesiops ''Paraplesiops'' is a genus containing five largely Allopatric speciation, allopatric species of fishes in the longfin, or roundhead, family Plesiopidae, commonly known as blue devils, bluedevils, or blue devilfish because of their colouration. ...

'' Bleeker, 1875 ** Genus ''

Plesiops ''Plesiops'' is a genus of ray-finned fishes in the family Plesiopidae. It is a genus of small fishes which vary in length from and and which live in shallow coral flats or around heads of coral. They have elongated pelvic fins and the other fi ...

'' Oken, 1817 ** Genus ''

Steeneichthys ''Steeneichthys'' is a genus of ray-finned fish in the family Plesiopidae, the longfin The longfins, also known as roundheads or spiny basslets, are a family, Plesiopidae, which were formerly placed in the order Perciformes or considered indete ...

'' Gerald R. Allen and Randall, 1985 ** Genus ''

Trachinops ''Trachinops'', the hulafishes, is a genus of ray-finned fish in the family Plesiopidae, the longfins or roundheads. Species There are four recognised species in the genus: * '' Trachinops brauni'' Allen Allen, Allen's or Allens may refer to: ...

'' Günther, 1861

References

* * {{Authority control Ovalentaria Taxa named by Albert Günther