Urotrygon rogersi (lat.) Is a poorly studied species of the genus Urotrygon of the family Urotrygonidae of the order of the caudate . Lives in the tropical waters of the eastern Pacific from California ]] to Ecuador . It occurs at a depth of 30 m. The pectoral fins of these slopes form a diamond-shaped disk, the width of which exceeds the length. The dorsal surface of the disc is painted in an even brownish color. The tail ends with a leaf-like caudal fin. In the middle of the caudal stem is a poisonous thorn. Maximum recorded length 46.2 cm.
| Urotrygon rogersi |
| Scientific classification |
|---|
| No rank : | Bilateral symmetric |
| Superfamily : | Urotrygon- like ( Urotrygonoidea ) |
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| International Scientific Name |
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Urotrygon rogersi DS Jordan & Starks , 1895 |
| Synonyms |
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Urolophus rogersi Jordan & Starks, 1895 - Urotrygon Binghami Breder, 1928
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| Security status |
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Not enough data IUCN Data Deficient : 161335 |
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Not an object of target fishing. As by- catch comes from commercial fishing [1] [2] [3] [4] . .
Content
The species was first scientifically described in 1895 [5] . The species is named after the medical scientist George Warren Rogers, who accompanied the authors of the description on the way home from Mazatlan , Sinaloa , Mexico [6] .
Urotrygon rogersi inhabit the tropical waters of the eastern Pacific Ocean from California to Ecuador. These bottom fish are found offshore on soft soil at a depth of 2 to 30 m [1] [7] .
The wide pectoral fins of these slopes merge with the head and form a diamond-shaped disk; in young rays, the width of the disk exceeds the length. The front edge of the disc forms an almost straight line. The pointed fleshy snout forms an obtuse angle and protrudes beyond the edges of the disc. With age, the disk lengthens, and the snout becomes more pointed [3] . Sprigulae are located behind the eyes. There are 5 pairs of gill slits on the ventral side of the disc. Small abdominal fins rounded. The tail narrows and turns into a low leaf-shaped caudal fin. The tail is slightly longer than the length of the disc. A longitudinal row of 30 spines runs from the “nape” along the midline of the disk to the tail [3] . On the dorsal surface of the tail in the central part there is a spike about 2.5 cm long. The skin is covered with small scales . The maximum recorded length is 46.2 cm [2] . Color brownish or yellowish without markings. The ventral surface is almost white [3] [8] [4] .
Urotrygon rogersi prey mainly on crustaceans , worms, small bony fish and bivalve mollusks . In search of prey, they agitate soft soil with pectoral fins [3] . Like other caudate-like, they reproduce by egg-production . Females are generally larger than males and grow slower. Life expectancy of males and females is estimated at 8 and 11 years, respectively. This species of urotrigons grows relatively quickly; by the end of the first year of life, stingrays reach 58% (females) and 70% (males) of the maximum disk width. Males and females become sexually mature with a disc width of 11.5–11.8 cm and 11.8–12.3 cm, respectively. The length of the newborns is about 7.5-8.2 cm. Pregnancy lasts 5-6 months [7] .
These ramps are not the target fishing target. As by- catch, they are caught in commercial fisheries. Caught fish are usually thrown overboard. Sometimes their meat is eaten [2] . There is insufficient data to evaluate the conservation status of the species by the International Union for Conservation of Nature [1] .
- ↑ 1 2 3 Urotrygon rogersi (English) . The IUCN Red List of Threatened Species .
- ↑ 1 2 3 Urotrygon rogersi in the FishBase database.
- ↑ 1 2 3 4 5 John Snow. Panamic Stingray, Urotrygon aspidura (unopened) (unreachable link) . Mexico fish, flora and fauna. Date of treatment October 18, 2014. Archived October 24, 2014.
- ↑ 1 2 McEachran, JD Urolophidae. Rayas redondas = W. Fischer, F. Krupp, W. Schneider, C. Sommer, KE Carpenter and V. Niem (eds.) Guia FAO para Identification de Especies para lo Fines de la Pesca. Pacifico Centro-Oriental. - Rome: FAO, 1995 .-- T. 3 .-- S. 786-792.
- ↑ Jordan, DS (1895) The fishes of Sinaloa. Proceedings of the California Academy of Sciences, (Series 2), 5: 377-514, 30 pls.
- ↑ Christopher Scharpf and Kenneth J. Lazara. Fish Name Etymology Database (Unreferenced) . The ETYFish Project . The appeal date is October 31, 2014.
- ↑ 1 2 Age and Growth of the Round Stingray Urotrygon rogersi, a Particularly Fast-Growing and Short-Lived Elasmobranch. Paola A. Mejía-Falla, Enric Cortés, Andrés F. Navia, Fernando A. Zapata // PLOS ONE. - 2014 .-- DOI : 10.1371 / journal.pone.0096077 .
- ↑ Urotrygon rogersi (English) information on the Encyclopedia of Life website (EOL).
