Bathyraja simoterus is a type of cartilaginous fish of the genus of the deep-water slopes of the Argynchobatidae family of the sloping order . They live in the temperate waters of the northwestern Pacific . They are found at a depth of 540 m. Their large, flattened pectoral fins form a rounded disc with a triangular snout. The maximum recorded length is 101 cm. Not target fishing [1] [2] .
| Bathyraja simoterus |
| Scientific classification |
|---|
| No rank : | Bilateral symmetric |
| Family: | One-rayed stingrays |
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| International Scientific Name |
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Bathyraja simoterus ( Ishiyama , 1967) |
| Synonyms |
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- Breviraja simoterus Ishiyama, 1967
- Raja parmifera (non Bean, 1881)
- Arctoraja simoterus (Ishiyama, 1967)
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Content
For the first time a new species was scientifically described in 1967 as Breviraja simoterus [3] . The holotype is an adult male 94.1 cm long, caught in Hokkaido , Japan [4] . The specific epithet comes from the words ancient-Greek. σῑμός - “snub-nosed” and lat. teres - "polished".
These rays inhabit the northwestern Pacific Ocean in the waters of Japan. They are found at a depth of 96 to 540 m [2] .
Wide and flat pectoral fins of these rays form a rhombic disk with a wide triangular snout and rounded edges. Behind the eyes are sprinklers . On the ventral side of the disc are 5 gill slits, nostrils and mouth. Lateral folds lie on the tail. These rays have 2 reduced dorsal fins and a reduced tail fin [1] .
The distance between the dorsal fins is 0.5–1% of the body length, the number of vertebrae in the prekadual section is 41–90. The number of spikes forming the median caudal series is 22-28. Compared to the Bathyraja pantera , these skates have an anterior body shorter and narrower, a tail shorter, and a mouth width of 8.1–9.1% [5] . The maximum recorded length is 101 cm [2] .
Embryos feed exclusively on yolk . These rays lay eggs enclosed in a horn capsule with hard “horns” at the ends [2] . The capsule is about 12 cm long and 9 cm wide [3] .
These stingrays are not targeted, they can be caught as by- catch . The International Union for Conservation of Nature has not yet appreciated the conservation status of the species.
- ↑ 1 2 Froese, Rainer, and Daniel Pauly, eds. Family Anacanthobatidae - Smooth skates ( Neopr .) . FishBase (2014).
- ↑ 1 2 3 4 Bathyraja simoterus (English) in FishBase database.
- ↑ 1 2 Ishiyama, R. Fauna Japonica. Rajidae (Pisces). - NOAA Professional Paper NMFS. - Biogeographical Society of Japan (Tokyo), 1967. - P. 1-82.
- ↑ Bathyraja simoterus ( Neopr .) . Shark-references.com. The appeal date is January 8, 2016.
- ↑ Orr, JW, Stevenson, DE, Hoff, GR, Spies, I. and JD McEachran. Bathyraja panthera , a new species of skate ( Rajidae: Arhynchobatinae ) from the suburbs of the subgenus Arctoraja Ishiyama // NOAA Professional Paper NMFS. - 2011. - Vol. 11. - P. 50.