Bathyraja schroederi is a rare and poorly studied species of cartilaginous fish of the genus of deep-sea rajids of the Arhynchobatidae family of the stingrays . They live in the temperate waters of the southwestern Atlantic Ocean between 19 ° S. w. - 56 ° S w. and 72 ° C. d. - 40 ° c. They are found at a depth of up to 3000 m. Their large, flattened pectoral fins form a rounded disk with a triangular snout. The maximum recorded length is 123 cm. Eggs are laid. They are not the target fishing target [1] [2] [3] .
| Bathyraja schroederi |
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| No rank : | Bilateral symmetrical |
| Subfamily : | One-Feathered Rays |
| View: | Bathyraja schroederi |
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Bathyraja schroederi ( Krefft , 1968) |
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- Breviraja scaphiops Krefft, 1968
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Not enough data IUCN Data Deficient : 63137 |
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For the first time, a new species was scientifically described in 1968 as Breviraja schroederi [4] . The species is named after William Schroeder (1895-1977), an employee of the Woods Hall Oceanographic Institute , for his contribution to the study of skates [5] . The holotype is an adult female 128 cm long, caught off the coast of Argentina ( ) at a depth of 1000 m. Paratypes: immature female 35–51 long, 6 cm, caught there at a depth of 800-1000.
These stingrays are common in the deep temperate waters of Brazil , Chile , Uruguay and the Falkland Islands . They are found on the mainland slope at a depth of 500 to 3000 m. Off the coast of Chile, the depth range ranges from 1000-1500 m [2] .
The broad and flat pectoral fins of these slopes form a rhombic disk with a wide triangular snout and rounded edges. Behind the eyes there are splashes . On the ventral side of the disc are 5 gill slits, nostrils and mouth. The tail is longer than the disk. Lateral folds lie on the tail. These skates have 2 reduced dorsal fins and a reduced caudal fin [1] . The maximum recorded length is 123 cm [2] . The snout is soft and dull. The dorsal surface of the disc is smooth and painted in an even gray-brown color without marks. The ventral surface of the disc, including the branchial, anal and oral regions, is completely dark. Scapular, orbital and interdental spines absent. The middle row of thorns is only on the tail. Spines are small, with rounded bases, often fall off. The tail is long and whip-like. The dorsal fins do not close, there is a large spine between them. In adult males, the alaric spines form 20 radial rows, 3-5 spines in a row. Males have elongated (about 30% of the disk width) thin pterygopodia with a thickening at the end [6] .
Embryos feed exclusively on yolk . These stingrays lay eggs enclosed in a horn capsule with solid "horns" at the ends [1] [3] .
These rare deep-sea slopes are not the target fishing target. The data for the assessment of the conservation status of the species by the International Union for Conservation of Nature are insufficient [2] .
