The guitarfish, also referred to as shovelnose rays, are a family, Rhinobatidae, of

rays Ray may refer to: Fish * Ray (fish), any cartilaginous fish of the superorder Batoidea * Ray (fish fin anatomy), a bony or horny spine on a fin Science and mathematics * Ray (geometry), half of a line proceeding from an initial point * Ray (gra ...

. The guitarfish are known for an elongated body with a flattened head and trunk and small, ray-like wings. The combined range of the various species is tropical, subtropical, and warm temperate waters worldwide.

Names

In Australia and

New Zealand New Zealand ( mi, Aotearoa ) is an island country in the southwestern Pacific Ocean. It consists of two main landmasses—the North Island () and the South Island ()—and over 700 smaller islands. It is the sixth-largest island count ...

, guitarfish are commonly referred to as shovelnose rays or shovelnose sharks.

Description

Guitarfish have a body from intermediate between those of sharks and rays. The tail has a typical shark-like form, but in many species, the head has a triangular, or

guitar The guitar is a fretted musical instrument that typically has six strings. It is usually held flat against the player's body and played by strumming or plucking the strings with the dominant hand, while simultaneously pressing selected strin ...

-like shape, rather than the disc-shape formed by fusion with the

pectoral fin Fins are distinctive anatomical features composed of bony spines or rays protruding from the body of a fish. They are covered with skin and joined together either in a webbed fashion, as seen in most bony fish, or similar to a flipper, as ...

s found in other rays.

Reproduction

Guitarfish are

ovoviviparous Ovoviviparity, ovovivipary, ovivipary, or aplacental viviparity is a term used as a "bridging" form of reproduction between egg-laying oviparous and live-bearing viviparous reproduction. Ovoviviparous animals possess embryos that develop insi ...

; the embryo matures inside an egg within the mother until it is ready to hatch. This is typical of rays.

Habitat

Guitarfish are

bottom feeder A bottom feeder is an aquatic animal that feeds on or near the bottom of a body of water. Biologists often use the terms ''benthos''—particularly for invertebrates such as shellfish, crabs, crayfish, sea anemones, starfish, snails, bristlewo ...

s that bury themselves in mud or sand and eat worms, crabs, and clams. Some can tolerate salt, fresh, and

brackish Brackish water, sometimes termed brack water, is water occurring in a natural environment that has more salinity than freshwater, but not as much as seawater. It may result from mixing seawater (salt water) and fresh water together, as in estu ...

water. They generally live close to the beach/coastline or in estuaries.

Evolution

Rays, including guitarfish, belong to the ancient lineage of cartilaginous fishes. Fossil denticles (tooth-like scales in the skin) resembling that of today's

chondrichthyan Chondrichthyes (; ) is a class that contains the cartilaginous fishes that have skeletons primarily composed of cartilage. They can be contrasted with the Osteichthyes or ''bony fishes'', which have skeletons primarily composed of bone tissue. ...

s date at least as far back as the

Ordovician The Ordovician ( ) is a geologic period and system, the second of six periods of the Paleozoic Era. The Ordovician spans 41.6 million years from the end of the Cambrian Period million years ago (Mya) to the start of the Silurian Period Mya. T ...

, with the oldest unambiguous fossils of cartilaginous fish dating from the middle Devonian. A clade within this diverse family, the

Neoselachii Elasmobranchii () is a subclass of Chondrichthyes or cartilaginous fish, including sharks (superorder Selachii), rays, skates, and sawfish (superorder Batoidea). Members of this subclass are characterised by having five to seven pairs of gi ...

, emerged by the

Triassic The Triassic ( ) is a geologic period and system (stratigraphy), system which spans 50.6 million years from the end of the Permian Period 251.902 million years ago (Year#Abbreviations yr and ya, Mya), to the beginning of the Jurassic Period 201.36 ...

, with the best-understood neoselachian fossils dating from the

Jurassic The Jurassic ( ) is a geologic period and stratigraphic system that spanned from the end of the Triassic Period million years ago (Mya) to the beginning of the Cretaceous Period, approximately Mya. The Jurassic constitutes the middle period of ...

. This clade is represented today by

shark Sharks are a group of elasmobranch fish characterized by a cartilaginous skeleton, five to seven gill slits on the sides of the head, and pectoral fins that are not fused to the head. Modern sharks are classified within the clade Selachi ...

sawfish Sawfish, also known as carpenter sharks, are a family of rays characterized by a long, narrow, flattened rostrum, or nose extension, lined with sharp transverse teeth, arranged in a way that resembles a saw. They are among the largest fish ...

, rays and skates.

Classification

Nelson's 2006 '' Fishes of the World'' recognized four genera in this family: '' Aptychotrema'', ''

Rhinobatos ''Rhinobatos'' is a genus of fish in the Rhinobatidae family. Although previously used to encompass all guitarfishes, it was found to be polyphyletic, and recent authorities have transferred many species included in the genus to ''Acroteriobatu ...

'', '' Trygonorrhina'', and '' Zapteryx''; other taxa once placed in the Rhinobatidae, such as '' Platyrhinoidis'' and '' Rhina'', have since been moved to their own families. Recently, the genus ''

Glaucostegus ''Glaucostegus'', also known as giant guitarfishes, is a genus of large Indo-Pacific rays, with a single species, ''Glaucostegus cemiculus'', in the East Atlantic, and Mediterranean. They were formerly classified in the family Rhinobatidae but a ...

'' has again become recognized as distinct from ''Rhinobatos''. ''

'' has been split in three genera based on genetic and morphological considerations: ''Rhinobatos'', ''

Acroteriobatus ''Acroteriobatus'' is a genus of fish in the Rhinobatidae family. Although its constituent species were previously assigned to '' Rhinobatos'', recent authors treat it as distinct. They are found near the shore off southern Africa and in the no ...

'' and ''

Pseudobatos ''Pseudobatos'' is a genus of fish in the Rhinobatidae family. Although its constituent species were previously assigned to '' Rhinobatos'', recent authors treat it as distinct. They are found in warmer coastal parts of the Americas, ranging fr ...

''. '' Tarsistes'' is dubious and may be a synonym of ''Pseudobatos'', and other genera formerly included in Rhinobatidae have been moved to Glaucostegidae, Rhinidae and Trygonorrhinidae. A 2021 re-evaluation of almost complete and articulated material from the Konservat-Lagerstätten of Bolca in Italy suggested that ''"Rhinobatos" dezignii'' and ''"Rhinobatos" primaevus'' should be excluded from ''Rhinobatos'' and assigned to the new genera †''Pseudorhinobatos'' gen. nov. and †''Eorhinobatos'' gen. nov. respectively. * Genus ''

'' Giltay, 1928 ** '' Acroteriobatus andysabini'' (2021) (Malagasy blue-spotted guitarfish) ** '' Acroteriobatus annulatus'' ( J. P. Müller & Henle, 1841) (Lesser guitarfish) ** '' Acroteriobatus blochii'' ( J. P. Müller & Henle, 1841) (Bluntnose guitarfish) ** '' Acroteriobatus leucospilus'' ( Norman, 1926) (Grayspotted guitarfish) ** '' Acroteriobatus ocellatus'' ( Norman, 1926) (Speckled guitarfish) ** '' Acroteriobatus omanensis'' Last, Hendeson & Naylor, 2016 (Oman guitarfish) ** '' Acroteriobatus salalah'' ( J. E. Randall & Compagno, 1995) (Salalah guitarfish) ** '' Acroteriobatus stehmanni'' (2021) (Socotra blue-spotted guitarfish) ** '' Acroteriobatus variegatus'' (

Nair The Nair , also known as Nayar, are a group of Indian Hindu castes, described by anthropologist Kathleen Gough as "not a unitary group but a named category of castes". The Nair include several castes and many subdivisions, not all of whom histo ...

& Lal Mohan, 1973) (Stripenose guitarfish) ** '' Acroteriobatus zanzibarensis'' ( Norman, 1926) (Zanzibar guitarfish) * Genus '' Eorhinobatos'' gen. nov. ** '' Eorhinobatos primaevus'' (De Zigno, 1874) comb. nov. * Genus ''

'' Last, Seret, and Naylor, 2016 ** ''

Pseudobatos buthi ''Pseudobatos buthi'', the spadenose guitarfish, is a ray in the family Rhinobatidae. Described in 2019 based on 82 museum specimens, little is known about this species in the wild. All 82 museum specimens were collected in the 1940s and 1950s ...

'' K.M. Rutledge, 2019 (Spadenose guitarfish) ** ''

Pseudobatos glaucostigmus ''Pseudobatos'' is a genus of fish in the Rhinobatidae family. Although its constituent species were previously assigned to ''Rhinobatos'', recent authors treat it as distinct. They are found in warmer coastal parts of the Americas, ranging fro ...

'' ( D. S. Jordan & C. H. Gilbert, 1883) (Speckled guitarfish) ** ''

Pseudobatos horkelii The Brazilian guitarfish (''Rhinobatos horkelii'') is a species of fish in the family Rhinobatidae. It is endemic to Brazil, where its natural habitat is coastal waters on the continental shelf. This fish is viviparous and has a long gestation p ...

'' ( J. P. Müller & Henle, 1841) (Brazilian guitarfish) ** ''

Pseudobatos lentiginosus ''Pseudobatos'' is a genus of fish in the Rhinobatidae family. Although its constituent species were previously assigned to ''Rhinobatos'', recent authors treat it as distinct. They are found in warmer coastal parts of the Americas, ranging fro ...

'' ( Garman, 1880) (Atlantic guitarfish) ** ''

Pseudobatos leucorhynchus ''Pseudobatos'' is a genus of fish in the Rhinobatidae family. Although its constituent species were previously assigned to ''Rhinobatos'', recent authors treat it as distinct. They are found in warmer coastal parts of the Americas, ranging fro ...

'' ( Günther, 1867) (Whitesnout guitarfish) ** '' Pseudobatos percellens'' ( Walbaum, 1792) (Chola guitarfish) ** ''

Pseudobatos planiceps The flathead guitarfish or Pacific guitarfish (''Rhinobatos planiceps'') is a species of fish in the Rhinobatidae family. It is found in Chile, Ecuador, Peru, and possibly Nicaragua. Its natural habitats are open sea The sea, connected as ...

'' ( Garman, 1880) (Pacific guitarfish) ** ''

Pseudobatos prahli ''Pseudobatos prahli'', also known by its common name Gorgona guitarfish is a species from the genus ''Pseudobatos ''Pseudobatos'' is a genus of fish in the Rhinobatidae family. Although its constituent species were previously assigned to '' R ...

'' ( Acero P & Franke, 1995) (Gorgona guitarfish) ** ''

Pseudobatos productus The shovelnose guitarfish, ''Rhinobatos productus'', is a ray in the family Rhinobatidae. It becomes mature at an estimated seven to eight years old. Males are between 90 and 100 cm long, while females are around 99 cm at that age.

'' ( Ayres, 1854) (Shovelnose guitarfish) * Genus '' Pseudorhinobatos'' gen. nov. ** '' Pseudorhinobatos dezignii'' (Heckel, 1853) comb. nov. * Genus ''

'' H. F. Linck, 1790 ** ''

Rhinobatos albomaculatus The white-spotted guitarfish (''Rhinobatos albomaculatus'') is a type of ray. It is found in the eastern Atlantic from the Gulf of Guinea to Angola , national_anthem = "Angola Avante"() , image_map = , map_caption ...

'' Norman, 1930 (white-spotted guitarfish) ** ''

Rhinobatos annandalei ''Rhinobatos annandalei'', or Annandale's guitarfish, is a type of ray. It is found in the Indian ocean around India, Pakistan, Sri Lanka and possibly the Persian Gulf The Persian Gulf ( fa, خلیج فارس, translit=xalij-e fârs, lit ...

'' Norman, 1926 (Annandale's guitarfish) ** ''

Rhinobatos borneensis ''Rhinobatos'' is a genus of fish in the Rhinobatidae family. Although previously used to encompass all guitarfishes, it was found to be polyphyletic, and recent authorities have transferred many species included in the genus to ''Acroteriobatu ...

'' Last, Séret & Naylor, 2016 (Borneo guitarfish) ** ''

Rhinobatos holcorhynchus ''Rhinobatos'' is a genus of fish in the Rhinobatidae family. Although previously used to encompass all guitarfishes, it was found to be polyphyletic, and recent authorities have transferred many species included in the genus to ''Acroteriobatu ...

'' Norman, 1922 (slender guitarfish) ** ''

Rhinobatos hynnicephalus The ringstreaked guitarfish (''Rhinobatos hynnicephalus'') is a species of fish in the Rhinobatidae family found in China, Japan, South Korea, Taiwan, and Vietnam. Its natural habitats are open seas, shallow seas, coral reefs, and estuarine A ...

'' J. Richardson, 1846 (Ringstreaked guitarfish) ** ''

Rhinobatos irvinei ''Rhinobatos'' is a genus of fish in the Rhinobatidae family. Although previously used to encompass all guitarfishes, it was found to be polyphyletic, and recent authorities have transferred many species included in the genus to ''Acroteriobatu ...

'' Norman, 1931 (spineback guitarfish) ** ''

Rhinobatos jimbaranensis ''Rhinobatos'' is a genus of fish in the Rhinobatidae family. Although previously used to encompass all guitarfishes, it was found to be polyphyletic, and recent authorities have transferred many species included in the genus to ''Acroteriobatu ...

'' Last, W. T. White & Fahmi, 2006 (Jimbaran shovelnose ray) ** ''

Rhinobatos lionotus ''Rhinobatos'' is a genus of fish in the Rhinobatidae family. Although previously used to encompass all guitarfishes, it was found to be polyphyletic, and recent authorities have transferred many species included in the genus to ''Acroteriobatu ...

'' Norman, 1926 (smoothback guitarfish) ** ''

Rhinobatos nudidorsalis The bareback shovelnose ray (''Rhinobatos nudidorsalis'') or nakedback guitarfish, is a species of fish in the Rhinobatidae family. It is found in Seychelles and Mauritius. Its natural habitat is open sea The sea, connected as the world oc ...

'' Last, Compagno & Nakaya, 2004 (Bareback shovelnose ray) ** ''

Rhinobatos penggali ''Rhinobatos'' is a genus of fish in the Rhinobatidae family. Although previously used to encompass all guitarfishes, it was found to be polyphyletic, and recent authorities have transferred many species included in the genus to ''Acroteriobatu ...

'' Last, W. T. White & Fahmi, 2006 (Indonesian shovelnose ray) ** ''

Rhinobatos punctifer ''Rhinobatos'' is a genus of fish in the Rhinobatidae family. Although previously used to encompass all guitarfishes, it was found to be polyphyletic, and recent authorities have transferred many species included in the genus to ''Acroteriobatu ...

'' Compagno & Randall, 1987 (spotted guitarfish) ** '' Rhinobatos rhinobatos''

Linnaeus Carl Linnaeus (; 23 May 1707 – 10 January 1778), also known after his ennoblement in 1761 as Carl von Linné Blunt (2004), p. 171. (), was a Swedish botanist, zoologist, taxonomist, and physician who formalised binomial nomenclature, the ...

, 1758 (common guitarfish) ** '' Rhinobatos sainsburyi'' Last, 2004 (goldeneye shovelnose ray) ** '' Rhinobatos schlegelii'' J. P. Müller & Henle, 1841 (brown guitarfish) ** '' Rhinobatos whitei''

Last A last is a mechanical form shaped like a human foot. It is used by shoemakers and cordwainers in the manufacture and repair of shoes. Lasts typically come in pairs and have been made from various materials, including hardwoods, cast iron, an ...

, Corrigan & Naylor, 2014 (Philippine guitarfish) * Genus †'' Myledaphus''

Cope The cope (known in Latin as ''pluviale'' 'rain coat' or ''cappa'' 'cape') is a liturgical vestment, more precisely a long mantle or cloak, open in front and fastened at the breast with a band or clasp. It may be of any liturgical colour. A c ...

, 1876 ** '' Myledaphus araucanus'' Otero, 2019 ** †'' Myledaphus bipartitus'' Cope, 1876

References

{{Taxonbar, from=Q829343 .01 Ray families Rhinopristiformes Late Jurassic fish Extant Late Jurassic first appearances Taxa named by Friedrich Gustav Jakob Henle