| Deepwater sicklefin houndshark | |
|---|---|
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Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Chondrichthyes |
| Order: | Carcharhiniformes |
| Family: | Triakidae |
| Genus: | Hemitriakis |
| Species: | H. abdita |
| Binomial name | |
| Hemitriakis abdita | |
 | |
The deepwater sicklefin houndshark (Hemitriakis abdita) or the darksnout houndshark, is a houndshark of the family Triakidae. It is found in the western central Pacific, in the Coral Sea off Queensland and in the waters off New Caledonia.
Houndsharks, the Triakidae, are a family of ground sharks, consisting of about 40 species in nine genera. In some classifications, the family is split into two subfamilies, with Mustelus, Scylliogaleus, and Triakis in the subfamily Triakinae, and the remaining genera in the subfamily Galeorhininae.
The barbeled houndshark is a species of ground shark and the only member of the family Leptochariidae. This demersal species is found in the coastal waters of the eastern Atlantic Ocean from Mauritania to Angola, at depths of 10–75 m (33–246 ft). It favors muddy habitats, particularly around river mouths. The barbeled houndshark is characterized by a very slender body, nasal barbels, long furrows at the corners of the mouth, and sexually dimorphic teeth. Its maximum known length is 82 cm (32 in).
The whiskery shark is a species of houndshark in the family Triakidae, and the only member of its genus. This common shark inhabits the Australian continental shelf from Western Australia to the Bass Strait, to a depth of 220 m (720 ft). It is demersal in habits and prefers rocky and vegetated habitats. Stout-bodied and almost "humpbacked" in form, the whiskery shark can be distinguished from all other members of its family by the presence of long nasal barbels. Its two moderately large dorsal fins are roughly equal in size. It is brownish gray above and lighter below, with a pattern of darker saddles and blotches in younger sharks. This species reaches 1.6 m (5.2 ft) in length.
The sailback houndshark is a houndshark of the family Triakidae, and the only member of the genus Gogolia. It is found in the deep waters of continental shelf off northern Papua New Guinea. Only one specimen has been found, at a depth of 73 m. It measured 74 cm in length. The reproduction of this shark is ovoviviparous.
The flapnose houndshark is a houndshark of the family Triakidae, and the only member of the genus Scylliogaleus. It is found in the waters off subtropical South Africa, in the western Indian Ocean between latitudes 27 and 33°S. This shark is estimated to be 2 to 3 feet in length. They are gray with a white underside, and they have a blunt nose with large fused nasal flaps. They have small pebble like teeth and their first and second dorsal fin are the same size. They feed primarily on crustaceans such as crabs, shrimps, lobsters and some molluscs like squid. Flapnose houndsharks are viviparous and have low fecundity having just two to four pups in a litter. After gestating for nine to ten months, females give birth to pups that are about 34 cm long. Newborn flapnose houndsharks have white coloured edges on their dorsal, anal and caudal fin. There have only been 30 recorded specimens. Not seen by biologists since 1902, one was captured in 2020 on the show Extinct or Alive. It was tagged with a pop-up tracking sensor and released.
Hemitriakis is a genus of houndsharks in the family Triakidae.
The longnose houndshark is a houndshark of the family Triakidae. It is found in the western Pacific off northern Australia and Vanuatu, between latitudes 9° S and 26° S, at depths between 250 and 475 m. It can grow up to a length of 75 cm.
The sharpfin houndshark is a houndshark of the family Triakidae. Only two specimens have been found, both in the coastal waters of Ecuador, the longest one being 1.02 m in length. The reproduction of this houndshark is ovoviviparous.
The spotted houndshark, Triakis maculata, is a houndshark of the family Triakidae found in tropical waters in the eastern Pacific Ocean off the coast of South America. It usually grows to a length around 180 centimetres (71 in). The reproduction of this houndshark is ovoviviparous, with a litter of 14 pups being found in one female with a birth size of 30 to 40 centimetres. Their diet is believed to consist mainly of crustaceans.
The sharptooth houndshark, or spotted gully shark is a species of houndshark in the family Triakidae found in shallow inshore waters from southern Angola to South Africa. Favoring sandy areas near rocky reefs and gullies, it is an active-swimming species that usually stays close to the bottom. This robust shark reaches 1.7 m (5.6 ft) in length and has characteristically large, rounded fins; the pectoral fins in particular are broad and sickle-shaped in adults. It also has a short, blunt snout and long furrows around its mouth. This species is gray or bronze in color above, with variable amounts of black spotting.
The banded houndshark is a species of houndshark in the family Triakidae, common in the northwestern Pacific Ocean from the southern Russian Far East to Taiwan. Found on or near the bottom, it favors shallow coastal habitats with sandy or vegetated bottoms, and also enters brackish water. This shark reaches 1.5 m (4.9 ft) in length. It has a short, rounded snout and mostly narrow fins; the pectoral fins are broad and triangular, and the trailing margin of the first dorsal fin is almost vertical. It is gray above and lighter below; younger sharks have darker saddles and dots, which fade with age.
The sicklefin houndshark is a rare houndshark of the family Triakidae, endemic to Western Australia. The holotype was collected from a depth of 150 metres (490 ft) Its reproduction is ovoviviparous.
The Japanese topeshark is a species of houndshark, in the family Triakidae. It can reach a length of up to 1.1 m. It is found in the subtropical northwest Pacific from China, Taiwan, Korea, and Japan, between latitudes 40° N and 21° N.
The whitefin topeshark is a houndshark of the family Triakidae, found only in the tropical waters of the Philippines between latitudes 20° N and 5° N. They inhabit the coastal areas. They can grow up to a length of 96 cm. Adolescent specimens have dark areas on their caudal fins. The reproduction of this shark is ovoviviparous.
The starry smooth-hound is a houndshark of the family Triakidae. It is found on the continental shelves of the northeast Atlantic, between latitudes 61 and 16° N, from the surface to a depth of 200 m (660 ft).
The dwarf smooth-hound is a houndshark of the family Triakidae. It is found on the continental shelves of the tropical western central Atlantic, off the coast of South America between Cabo de la Vela, Colombia and Rio Caribe, Venezuela, at depths between 70 and 180 m. It can grow up to a length of 48 cm. The reproduction of dwarf smooth-hounds is ovoviviparous.
The whitespotted smooth-hound is a houndshark of the family Triakidae. It is found on the continental shelves of the southeast Atlantic from Namibia around South Africa, between latitudes 17° S and 36° S, from the surface to a depth of 440 m. It can reach a length of 1.2 m. The reproduction of this houndshark is ovoviviparous.
The blackspotted smooth-hound is a houndshark of the family Triakidae found on the continental shelves of the subtropical eastern Atlantic from the Mediterranean to the Western Sahara, between latitudes 45 and 20°N, from the surface to a depth of 250 m. It can reach of a length of 1.5 m.
The narrownose smooth-hound is a houndshark of the family Triakidae. It is found on the continental shelves of the subtropical southwest Atlantic, from southern Brazil to northern Argentina, between latitudes 30° S and 44° S, at depths between 60 m to 195 m. It can reach a length of 74 centimeters.
The Indonesian houndshark is a species of houndshark in the genus Hemitriakis. It is a tropical houndshark, known from the eastern Indonesian islands of Bali and Lombok, in the Indian Ocean. It was described by William T. White, Leonard J.V. Compagno, and Dharmadi in 2009. Females give birth to live young, with no placenta or yolk sac, and can have between six and 11 pups in one litter. When born, the pups measure 28–30 cm long. At first maturity, the houndsharks measure 90 cm, and males can go on to reach a maximum length of 120 cm, while females can reach a maximum length of 115 cm.
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