Trygonoptera galba (lat.) Is a species of the genus Trigonopters of the family of short-tailed stingrays of the order of tailed - tailed . Endemic to the west coast of Australia . It occurs at a depth of up to 210 m. The body is oval with an elongated triangular snout, a short tail with a tail fin. Dorsal fins absent. The nostrils have enlarged lobes in the external protrusions and a fold of skin in the form of a skirt with a fringed posterior edge between them. The color is even gray or dark yellow, the caudal fin is darker. The maximum registered length is 39.4 cm. They are not of interest for commercial fishing [1] [2] .
| Trygonoptera galba |
| Scientific classification |
|---|
| No rank : | Bilateral symmetrical |
| Family: | Short-tailed Stingers |
|
| International scientific name |
|---|
Trygonoptera galba Last & Yearsley , 2008 |
| Security status |
|---|
Not enough data IUCN Data Deficient : 60080 |
|
Content
The first specimen of a new species was obtained by the crew of the Taiwanese Hai Kung vessel in the winter of 1981 during a test fishing off the coast of Western Australia . Initially, it was identified as Trygonoptera "sp. A , and in 2008 it was given its current name and made a scientific description. [3] The holotype is an adult male 32.8 cm long, captured from Skal Hautman ( ) at a depth of 100-183 m. Paratypes: immature male 28.1 cm long, females 26.8–29.8 cm caught in the same place, immature male and a female 31.5–33.9 cm long and an immature 29.9 cm long male, caught southwest of Shark Bay at a depth of 105-180 m, and a 39.4 cm long female, caught north of the Houtman Rocks at a depth 196-210 m [4] . The species epithet comes from the Latin latus word “yellow-green” [5] and is associated with the dorsal surface of these rays.
Trygonoptera galba are endemic to the coastal waters of Western Australia. They live on a relatively narrow section of the continental shelf from Shark Bay to the Hautman Cliffs and, possibly, Perth at a depth of 100 to 210 m. They prefer a sandy bottom [6] . Similar trigonopters have been found at Rottnest Island and the Great Australian Gulf . They probably also belong to the genus Trygonoptera galba [3] .
The broad pectoral fins of Trygonoptera galba merge with the head and form a disk in the form of an oval , the width of which slightly exceeds the length. The front edge of the disc is slightly curved. The fleshy snout forms an obtuse angle and does not protrude beyond the boundaries of the disc. Medium-sized eyes are located in the upper part of the disk and are widely spaced, behind the eyes there are splashes in the form of commas , the tail of which is located in the middle of the eyes. The trailing edge of the spray is pointed. The outer edges of the nostrils pass into a wide and flat lobe. Between the nostrils lies a leather flap with a fringed posterior edge that hangs over the mouth. The lower jaw hides the upper, the outer edge of the lower jaw is covered with finger-shaped processes. The bottom of the oral cavity is covered with eight or more processes. The teeth are small, with diamond-shaped bases. They are staggered. The central teeth are pointed and the posterior teeth are blunted. There are 19–20 upper and 22–23 lower dentitions in the mouth. Five pairs of short gill slits are located on the ventral surface of the disk [3] [6] [7] .
The ventral fins are triangular in shape. Males have short and thick pterygopodia. The tail length is less than 1/8 of the length of the disc. The base of the tail is slightly flattened, towards the end the tail narrows, acquiring a lanceolate shape. Dorsal fins and lateral folds on caudal peduncle absent. A large serrated spine is located on the dorsal surface of the tail immediately behind the base. The skin is devoid of scales . Coloring even deep yellow or yellow-brown. The ventral surface is white, sometimes the edges of the disc are darker, and there are spots on the belly. The maximum recorded length is 39 cm [3] [6] .
Trygonoptera galba, like other caudate- like breeds, is oviparous. The length of newborns is about 16 cm. Males reach puberty with a length of 33–36 cm [6] .
These ramps are not of interest for commercial fishing. There is no intensive fishing in their range. There is insufficient data to evaluate the conservation status of the species by the International Union for Conservation of Nature [1] .
- ↑ 1 2 Trygonoptera galba . The IUCN Red List of Threatened Species .
- ↑ Trygonoptera galba in the FishBase database.
- ↑ 1 2 3 4 Last, PR and GK Yearsley. Trygonoptera galba sp. nov., a new stingaree (Myliobatoidei: Urolophidae) from Southwestern Australia // In Last, PR, White, WT & Pogonoski, JJ (eds.): Descriptions of New Australian Chondrichthyans. CSIRO Marine and Atmospheric Research Paper. - 2008. - No. 22 . - P. 269-274.
- ↑ Trygonoptera galba (neopr.) . Shark References. Date of treatment September 6, 2014.
- ↑ Large Latin-Russian Dictionary (Neopr.) . Date of treatment April 9, 2014.
- ↑ 1 2 3 4 Last, PR; Stevens, JD Sharks and Rays of Australia. - (second ed.). - Harvard University Press, 2009. - P. 409-410. - ISBN 0—674-03411—2.
- ↑ Last, PR and LJV Compagno. Myliobatiformes: Urolophidae ". In Carpenter, KE and VH Niem. FAO identification guide for fishery purposes: The living marine resources of the Western Central Pacific. - Food and Agricultural Organization of the United Nations, 1999. - pp. 1469-1476. - ISBN 92-5-104302-7.
