Dipturus flindersi (lat.) - a species of cartilaginous fish of the rhombic family of rays of the order of stingrays. They live in subtropical waters washing the southern coast of Australia . They are found at a depth of 54 m. Their large, flattened pectoral fins form a rhombic disk with a rounded snout. Maximum recorded length is 32.6 cm. Lay eggs [1] [2] .
| Dipturus flindersi |
| Scientific classification |
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| No rank : | Bilateral symmetric |
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| International Scientific Name |
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Dipturus flinders Last & Gledhill , 2008 |
| Synonyms |
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- Dentiraja flinders Last & Gledhill, 2008
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| Security status |
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Not enough data IUCN Data Deficient : 195443 |
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Content
The species was first scientifically described in 2008 as Dentiraja flinders [3] . The holotype is a mature male, 29.3 cm long, caught off the coast of South Australia ( ) at a depth of 32 m. Paratypes: Adult males 27–31 long 6 cm, immature males 17.4–24.2 cm long, a young male 25.1 cm long and females 26.9–32.6 cm long, caught there at a depth of 30–54 m [4] . The species is named by geographic habitat ( Flindersian province).
These bentopelagic slopes are endemics of the southern waters of Australia. They are found at a depth of 27 to 54 m [2] .
The wide and flat pectoral fins of these rays form a rhombic disk with a rounded snout and rounded edges. On the ventral side of the disc are 5 gill slits, nostrils and mouth. On the long tail there are lateral folds. These rays have 2 reduced dorsal fins and a reduced tail fin [1] .
The width of the disk is 1.1-1.2 times the length and is 64-71% of the length of the body. The elongated and pointed snout forms an angle of 100 ° –114 °. The length of the short tail is 0.8–0.9 distances from the tip of the snout to the cloaca. The tail is quite wide. Its width in the middle part is 2.0–2.8 of its height and 2.0–2.6 at the base of the first dorsal fin. The distance from the tip of the snout to the upper jaw is 11–13% of the body length and 1.2–1.3 times the distance between the nostrils. The length of the head on the ventral side is 27–31% of the body length. The length of the snout is 2.1-2.6 times greater, and the diameter of the eye is 54-77% of the interorbital space. The height of the first dorsal fin is 1.8-2.4 times the length of its base. The distance between the beginning of the base of the first dorsal fin and the tip of the tail is 2.1–2.6 times greater than the length of its base and 8 times the length of the caudal fin. The ventral fins are large. The length of the posterior lobe in adult males reaches 25% of the body length, and the length of the anterior lobe is 60-69% of the length of the back. The length of pterygopodia is 26% of body length. The dorsal surface of the front edge of the disk is covered with a strip of spines. The ventral surface is bare. There are 0–5 spines in the occipital region, malar spines usually small, tail covered with 3 rows of spines. The pectoral fins are formed by 70-74 rays. The number of vertebrae is 94-109. The upper jaw has 34–41 dentitions. The dorsal surface of the disc is yellowish-brown, sometimes spotted. Ventral surface pale yellow or whitish. The tip of the snout is black [3] . The maximum recorded length is 32.6 cm [2] .
Like other rhombic, these stingrays lay eggs enclosed in a hard horn capsule with protrusions at the ends. The capsule length is 5.6-6.9 cm, and its width is 4.5-5.3 cm. Embryos feed exclusively on yolk [2] . The size of immature males ranges from 41.5-53.4 cm. The smallest free-swimming individual had a length of 22 cm [2] .
Data for assessment by the International Union for Conservation of Nature of the conservation status of the species is insufficient [5] .
- ↑ 1 2 Froese, Rainer, and Daniel Pauly, eds. Family Rajidae - Skates (Unsolved) . FishBase.
- ↑ 1 2 3 4 5 Dipturus flindersi (English) in FishBase database.
- ↑ 1 2 Last P. & Gledhill DC A new skate of the genus Dentiraja (Rajoidei: Rajidae) from southern Australia // CSIRO. - 2008. - Vol. 21. - P. 109-118.
- ↑ Dipturus flinders ( Neopr .) . Shark-References. The appeal date is May 26, 2016.
- ↑ Dipturus flinders (English) . The IUCN Red List of Threatened Species .
- View Dipturus flindersi (English) in the World Register of Marine Species ( World Register of Marine Species ).
