''Trygonorrhina'', also known as the fiddler rays or banjo rays, is a

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial nom ...

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

, family Rhinobatidae. The two species are found along the eastern and southern coasts of Australia. They are benthic in nature, favoring shallow, sandy bays, rocky

reef A reef is a ridge or shoal of rock, coral or similar relatively stable material, lying beneath the surface of a natural body of water. Many reefs result from natural, abiotic processes— deposition of sand, wave erosion planing down rock o ...

s, and

seagrass Seagrasses are the only flowering plants which grow in marine environments. There are about 60 species of fully marine seagrasses which belong to four families (Posidoniaceae, Zosteraceae, Hydrocharitaceae and Cymodoceaceae), all in the or ...

beds. The eastern fiddler is found to a depth of 120 m and the southern fiddler to a depth of 180 m.Aitken, K. (2002)
Southern Fiddler Ray ''(Trygonorrhina dumerilii)'' & Eastern Fiddler Ray ''(Trygonorrhina faciata)''. Rhinobatidae
. ''Marine Themes''. The flattened

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 ...

discs of fiddler rays are shorter and more rounded than those of other guitarfishes. Their tails are slender, with a well-developed

caudal 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 ...

and two triangular

dorsal fin A dorsal fin is a fin located on the back of most marine and freshwater vertebrates within various taxa of the animal kingdom. Many species of animals possessing dorsal fins are not particularly closely related to each other, though through c ...

s.McGrouther, M. (2006)
Eastern Fiddler Ray, ''Trygonorrhina faciata''
''Australian Museum''. Their snouts are translucent. The fiddler rays are also distinguished from other guitarfishes in that the anterior nasal flaps of their

nostril A nostril (or naris , plural ''nares'' ) is either of the two orifices of the nose. They enable the entry and exit of air and other gasses through the nasal cavities. In birds and mammals, they contain branched bones or cartilages called turbi ...

s are expanded backwards and fused together into a nasal curtain that reaches the mouth. Fiddler rays feed on bottoms shellfish, crabs, and

worm Worms are many different distantly related bilateral animals that typically have a long cylindrical tube-like body, no limbs, and no eyes (though not always). Worms vary in size from microscopic to over in length for marine polychaete wo ...

s, which they crush between their

jaw The jaw is any opposable articulated structure at the entrance of the mouth, typically used for grasping and manipulating food. The term ''jaws'' is also broadly applied to the whole of the structures constituting the vault of the mouth and serv ...

s. The eastern fiddler ray is known to

scavenge Scavengers are animals that consume dead organisms that have died from causes other than predation or have been killed by other predators. While scavenging generally refers to carnivores feeding on carrion, it is also a herbivorous feeding b ...

from

fish trap A fish trap is a trap used for fishing. Fish traps include fishing weirs, lobster traps, and some fishing nets such as fyke nets. Traps are culturally almost universal and seem to have been independently invented many times. There are two ma ...

s. Like other guitarfishes, fiddler rays 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

egg An egg is an organic vessel grown by an animal to carry a possibly fertilized egg cell (a zygote) and to incubate from it an embryo within the egg until the embryo has become an animal fetus that can survive on its own, at which point the a ...

capsules of the southern fiddler ray are reported to be golden in colour, containing three embryos each. It gives birth to litters of four to six young per breeding cycle. Fiddler rays are harmless and easily approached by divers. Southern fiddler rays are taken as bycatch by

commercial trawler A fishing trawler is a commercial fishing vessel designed to operate fishing trawls. Trawling is a method of fishing that involves actively dragging or pulling a trawl through the water behind one or more trawlers. Trawls are fishing nets tha ...

s and by recreational fishers; the flesh is of good quality and sold in small quantities. The Magpie fiddler ray (previously ''Trygonorrhina melaleuca'') is now considered a variant of ''Trygonorrhina dumerilii''.Donnellan, S.C., Foster, R., Junge, C., Huveneers, C., Rogers, P., Kilian, A. & Bertozzi, T. (2015): Fiddling with the proof: the Magpie Fiddler Ray is a colour pattern variant of the common Southern Fiddler Ray (Rhinobatidae: ''Trygonorrhina''). ''Zootaxa, 3981 (3): 367–384.''

Species

There are currently 2 recognized species in this genus: * '' Trygonorrhina dumerilii'' Castelnau, 1873 (Southern fiddler ray) * '' Trygonorrhina fasciata'' J. P. Müller &

Henle Henle can refer to: * Friedrich Gustav Jakob Henle, a German physician, pathologist and anatomist (1809–1885) ** Loop of Henle in the kidney, named after Henle *Fritz Henle, a photographer, known as "Mr. Rollei" for his use of the 2.25" square for ...

, 1841 (Eastern fiddler ray)

References

{{Taxonbar, from=Q3541202 Rhinobatidae Taxa named by Friedrich Gustav Jakob Henle