Cephaloscyllium variegatum Last & White 2008

Cephaloscyllium variegatum és una espècie de peix de la família dels esciliorínids i de l'ordre dels carcariniformes.

Morfologia

• Els mascles poden assolir 72 cm de longitud total.^[4]

Hàbitat

És un peix marí de clima subtropical que viu entre 114-606 m de fondària.^[4]

Distribució geogràfica

Es troba a Austràlia.^[4][5]

Referències

Bibliografia

• Compagno, L.J.V.: FAO species catalogue. Volum 4. Sharks of the world. An annotated and illustrated catalogue of shark species known to date. Part 2 - Carcharhiniformes. FAO Fish. Synop. 125(4/2):251-655. Any 1984.
• Compagno, L.J.V. i V.H. Niem, 1998. Scyliorhinidae. Catsharks. p. 1279-1292. A: K.E. Carpenter i V.H. Niem (eds.) FAO Identification Guide for Fishery Purposes. The Living Marine Resources of the Western Central Pacific. FAO, Roma, Itàlia.
• Compagno, L.J.V., D. Dando i S. Fowler, 2005. A field guide to the sharks of the world. Harper Collins Publishing Ltd., Londres, Gran Bretanya, 368 p.
• Eschmeyer, William N.: Genera of Recent Fishes. California Academy of Sciences. San Francisco, Califòrnia, Estats Units. iii + 697. ISBN 0-940228-23-8 (1990).
• Eschmeyer, William N., ed. 1998. Catalog of Fishes. Special Publication of the Center for Biodiversity Research and Information, núm. 1, vol. 1-3. California Academy of Sciences. San Francisco, Califòrnia, Estats Units. ISBN 0-940228-47-5.
• Helfman, G., B. Collette i D. Facey: The diversity of fishes. Blackwell Science, Malden, Massachusetts (Estats Units), 1997.
• Last, P. R., B. Séret i W. T. White, 2008: New swellsharks (Cephaloscyllium: Scyliorhinidae) from the Indo-Australian region. A: Descriptions of new Australian Chondrichthyans. CSIRO Marine and Atmospheric Research Paper Núm. 022: 129-146.
• Moyle, P. i J. Cech.: Fishes: An Introduction to Ichthyology, 4a edició, Upper Saddle River, Nova Jersey, Estats Units: Prentice-Hall. Any 2000.
• Nelson, Joseph S.: Fishes of the World, John Wiley & Sons. ISBN 0-471-25031-7. Any 2006.
• Schaaf-Da Silva, J. A. i D. A. Ebert, 2008: A revision of the western North Pacific swellsharks, genus Cephaloscyllium Gill 1862 (Chondrichthys: Carcharhiniformes: Scyliorhinidae), including descriptions of two new species. Zootaxa Núm. 1872: 1-8.
• Wheeler, A.: The World Encyclopedia of Fishes, 2a edició, Londres: Macdonald. Any 1985.

Enllaços externs

• AQUATAB

Cephaloscyllium variegatum sī chi̍t khoán soa-hî, sī Cephaloscyllium lūi ê niau-soa.

Chham-khó chu-liāu

• "Cephaloscyllium variegatum", FishBase.

The saddled swellshark (Cephaloscyllium variegatum) is a rare species of catshark, and part of the family Scyliorhinidae, endemic to Eastern Australia. This bottom-dwelling species is found on the outer continental shelf and upper continental slope at a depth of 115–605 m (377–1,985 ft). It is a robustly built shark with a short, broad, flattened head and a capacious mouth. Adults are patterned with saddles on a brownish or grayish background, which varies between tropical and temperate sharks; juveniles are light-colored with many spots. This shark reaches 74 cm (29 in) in length. Like other swellsharks, it can inflate itself as a defensive measure. Reproduction is oviparous.

Taxonomy

In 1994, Commonwealth Scientific and Industrial Research Organisation (CSIRO) chief researchers Peter Last and John Stevens recognized five undescribed swellsharks in Australian waters. Later investigation revealed that the forms provisionally named Cephaloscyllium "sp. B" and "sp. C" may represent clinal variants of a single species, which was described by Peter Last and William White in a 2008 CSIRO publication.^[2] The specific epithet variegatum comes from the Latin word for "various", and refers to the large amount of color variation within this species. The type specimen is 68 cm (27 in) long adult male, collected from east of Newcastle, New South Wales.^[2]

Description

The saddled swellshark reaches a maximum known length of 74 cm (29 in). It has a moderately stocky body and a short, variably wide, and strongly flattened head. The snout is broadly rounded, with the nostrils preceded by laterally expanded flaps of skin that do not reach the large mouth. The slit-like eyes are positioned high on the head and followed by tiny spiracles. The tooth rows number 68–82 in the upper jaw and 68–80 in the lower jaw. The very small teeth have three cusps, with the central one the longest and sometimes 1–2 additional lateral cusplets. In females the central cusp is smaller than in males. There are no furrows at the corners of the mouth, and the upper teeth are exposed when the mouth is closed. The fourth and fifth gill slits lie over the pectoral fin bases and are shorter than the first three.^[2]

The pectoral fins are large and broad, with rounded margins. The first dorsal fin is fairly angular and originates over the middle of the pelvic fin bases. The second dorsal fin is much smaller and lower than the first, originating behind the anal fin origin. The pelvic fins are small, with elongate, relatively short claspers in males. The anal fin is substantially larger and deeper than the second dorsal fin. The caudal fin is deep, with a distinct lower lobe and a strong ventral notch near the tip of the upper lobe. The body is densely covered by minute dermal denticles, each shaped like an arrowhead and bearing a median ridge.^[2][3]

The saddled swellshark is brownish or grayish in color above, with 11 darker saddles of varying width over the body and tail and usually no blotches on the flanks. Individuals from tropical waters ("sp. B") tend to have more defined saddles, while those from temperate waters ("sp. C") have fainter saddles and a smattering of lighter flecks. The underside is a plain light color, often with a few darker marks. The juveniles are pale with many dark brown spots.^[2]

Distribution and habitat

The saddled swellshark is found off the eastern coast of Australia, as far north as Rockingham Bay in Queensland and as far south as Tathra in New South Wales, and perhaps also the Britannia Seamount near Brisbane. It is a bottom-dwelling species that inhabits the outer continental shelf and upper continental slope at a depth of 115–605 m (377–1,985 ft).^[3]

Biology and ecology

Like other members of its genus, the variegated swellshark can inflate itself with water or air as a defensive measure.^[3] This species is oviparous, with its eggs contained in smooth, brownish capsules about 7 cm (2.8 in) long. The egg capsule is thick and rounded, with flanged lateral margins and a pair of horns at each end, which support very long, coiled tendrils. The smallest known free-swimming specimen measured 17 cm (6.7 in) long; males mature sexually at a length of 55–60 cm (22–24 in).^[2][3]

Human interactions

The International Union for Conservation of Nature (IUCN) has listed the saddled swellshark under Near Threatened until more information is available. Currently, little fishing occurs in the region where this shark is found, but should that change it may be vulnerable due to its apparent rarity and benthic habits.^[1]

References

Cephaloscyllium variegatum es una especie de peces de la familia Scyliorhinidae en el orden de los Carcharhiniformes.

Morfología

• Los machos pueden llegar alcanzar los 72 cm de longitud total.^[1]​

Hábitat

Es un pez de mar y de clima subtropical que vive entre 114-606 m de profundidad.

Distribución geográfica

Se encuentra en Australia.

Referencias

Bibliografía

• Fenner, Robert M.: The Conscientious Marine Aquarist. Neptune City, Nueva Jersey, Estados Unidos: T.F.H. Publications, 2001.
• Helfman, G., B. Collette y D. Facey: The diversity of fishes. Blackwell Science, Malden, Massachusetts, Estados Unidos, 1997.
• Hoese, D.F. 1986: . A M.M. Smith y P.C. Heemstra (eds.) Smiths' sea fishes. Springer-Verlag, Berlín, Alemania.
• Maugé, L.A. 1986. A J. Daget, J.-P. Gosse i D.F.E. Thys van den Audenaerde (eds.) Check-list of the freshwater fishes of Africa (CLOFFA). ISNB Bruselas; MRAC, Tervuren, Flandes; y ORSTOM, París, Francia. Vol. 2.
• Moyle, P. y J. Cech.: Fishes: An Introduction to Ichthyology, 4a. edición, Upper Saddle River, Nueva Jersey, Estados Unidos: Prentice-Hall. Año 2000.
• Nelson, J.: Fishes of the World, 3a. edición. Nueva York, Estados Unidos: John Wiley and Sons. Año 1994.
• Wheeler, A.: The World Encyclopedia of Fishes, 2a. edición, Londres: Macdonald. Año 1985.

Cephaloscyllium variegatum Cephaloscyllium generoko animalia da. Arrainen barruko Scyliorhinidae familian sailkatzen da.

Erreferentziak

• FishBase.org

Ikus, gainera

• Cephaloscyllium
• Scyliorhinidae

Cephaloscyllium variegatum is een vissensoort uit de familie van de kathaaien (Scyliorhinidae).^[1] De wetenschappelijke naam van de soort is voor het eerst geldig gepubliceerd in 2008 door Last & White.

• 1 Опис
• 2 Спосіб життя
• 3 Розповсюдження
• 4 Джерела

Cephaloscyllium variegatum là một loài cá nhám hoa hiếm trong họ Scyliorhinidae, đặc hữu của Úc.^[1]

Chú thích

Tham khảo

• Dữ liệu liên quan tới Cephaloscyllium variegatum tại Wikispecies
• Barratt, P.J. and P.M. Kyne (2003). Cephaloscyllium variegatum. 2008 Sách đỏ IUCN. Liên minh Bảo tồn Thiên nhiên Quốc tế 2008. Truy cập ngày 11 tháng 2 năm 2010.
• Last, P.R. and J.D. Stevens (2009). Sharks and Rays of Australia (second ed). Harvard University Press. p. 215. ISBN 0-674-03411-2.
• Last, P.R. and W.T. White (2008). "Two new saddled swellsharks (Cephaloscyllium: Scyliorhinidae) from eastern Australia" in Last, P.R., W.T. White and J.J. Pogonoski (eds). Descriptions of new Australian Chondrichthyans. CSIRO Marine and Atmospheric Research Paper No. 022: 159–170. ISBN 9780192142412.

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• 1 Таксономия
• 2 Ареал
• 3 Описание
• 4 Биология
• 5 Примечания