The Bahamas pilonos [1] , or the Atlantic pilonos [2] ( lat. Pristiophorus schroederi ) is a species of cartilaginous fish of the genus Pilonos of the family of poniferous sharks . These sharks live in the western part of the Atlantic Ocean at a depth of up to 950 m. The maximum recorded length is 80 cm. At the elder, the elongated snout forms a sawtooth rostrum, dotted with lateral teeth. There are antennae on the rostrum. These sharks breed by egg production . Not of interest to commercial fishing [3] .
| Bahamas sawn |
| Scientific classification |
|---|
| No rank : | Bilateral symmetric |
| Squad: | Pile-shaped ( Pristiophoriformes Compagno , 1973 ) |
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| International Scientific Name |
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Pristiophorus schroederi
Springer & Bullis , 1960 |
| Area |
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| Security status |
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Not enough data IUCN Data Deficient : 60226 |
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Content
The species was first scientifically described in 1960 [4] . The holotype is a female, 37 cm long, caught in the Bahamas ( ) at a depth of 640 m. Paratypes : male and 64.5 cm long and 80.5 cm, respectively, caught there at a depth of 914β950 m [5] . The species is named after William S. SchrΓΆder, a member of the Woods Hole Institute of Oceanography and a specialist in sharks and rays [6] .
Bahamas pylonias live in the western part of the Atlantic Ocean in a limited area between Cuba , Florida and the Bahamas . These deep-sea sharks are found on the continental slope at a depth of 400 to 950 m [3] .
Bahamas sawn-ups have an elongated, slightly flattened, but not flattened body. The head is also slightly flattened, but not stretched laterally. Snout elongated and flattened, elongated in the form of a very long and narrow sawtooth rostrum with lateral teeth. Its length is 31-32% of body length. On the bottom surface of the snout is a pair of antennae, performing the functions of touch. On each side of the rostrum, in front of the antennae there are 13-14 large teeth and 9-10 behind the antennae. The edges of large teeth are smooth. The distance between the rostral antennae and the nostrils is equal to the distance from the antennae to 2-4 gill slit. The distance from the mouth to the nostrils is 1.2 times the distance between the nostrils. There are 33β36 teeth on the upper jaw [3] .
Two dorsal fins lack spines at base. Anal fin absent. The base of the first dorsal fin is located at the level of the space between the pectoral and ventral fins. Pectoral fins rather large, but not pterygoid. Pelvic fins small. The mouth is small, curved and short, located before the eyes. There are nasal grooves that are not connected to the mouth. The labial grooves are short. Oval rather large eyes stretched horizontally. The third eyelid is missing. 5 pairs of gill slits of approximately the same length. Behind the eyes there are large squiggles . The tail fin is asymmetrical, the upper lobe is elongated, the lower one is absent. Large specimens have dorsal and pectoral fins covered with placoid scales. The body is covered with large pointed placoid scales . The maximum recorded length is 80 cm.
Bahamas sawn-ups are likely to breed by egg production. Probably, like other pilonos, rostral large teeth in embryos erupt shortly before birth, but in order not to harm the mother they remain pressed to the rostrum, and small ones erupt between large ones after birth, and large teeth also straighten out [3 ] . The length of newborns is about 30 cm [7] .
A flat head and snout, a large occipital condyle and specialized cervical vertebrae allow the ponos to use the rostrum as a powerful weapon to rummage in the soil and kill the victim. However, this behavior was not recorded in person, since, unlike sawn-headed skates , these sharks cannot be kept in captivity. Very short jaws and an elongated mouth and gill cavities suggest that southern pilosses are able to suck in prey suddenly [3] .
Bahamas pylonias do not pose a danger to humans. There is no deep-water fishery in their range. Data for assessing the conservation status of the species by the International Union for Conservation of the Nature is insufficient [7] .
- β Reshetnikov Yu. S. , Kotlyar A. N. , Russ T. S. , Shatunovsky M. I. Pyatiazychny dictionary of animal names. Fish. Latin, Russian, English, German, French. / edited by Acad. V.E. Sokolova . - M .: Rus. laz., 1989. - p. 38. - 12 500 copies. - ISBN 5-200-00237-0 .
- β Gubanov E. P., Kondyurin V. V., Myagkov N. A. Sharks of the World Ocean: Reference guide. - M .: Agropromizdat, 1986. - p. 222. - 272 p.
- β 1 2 3 4 5 Compagno, Leonard JV 1. Hexanchiformes to Lamniformes // FAO species catalog. - Rome: Food and Agricultural Organization of the United Nations, 1984. - Vol. 4. Sharks of the World: An Antaled and Illustrated Catalog of Shark Species Known to Date. - P. 133β138. - ISBN 92-5-101384-5 .
- β Stewart Springer & Harvey R. Bullis, 1960 A new species of sawshark, Pristiophorus schroederi, from the Bahamas. Bulletin of Marine Science of the Gulf and Caribbean, 10 (2): 241β254
- β Pristiophorus schroederi (Neopr.) . Shark references. The appeal date is March 7, 2014.
- β Christopher Scharpf and Kenneth J. Lazara. Fish Name Etymology Database (Unreferenced) . The ETYFish Project . The appeal date is March 7, 2014.
- β 1 2 Bahamas Pilonos (English) . The IUCN Red List of Threatened Species . The appeal date is March 10, 2014.
