Bahamas sawshark. Source Oceana.org . The Bahamas sawshark belongs to the family of sawsharks (Pristiophoridae) characterized by having a flattened snout full of sharp spikes that they use to dig up and kill their prey. The Bahamas sawshark, that lives in Bahamas and Cuba, can reach up to 140 centimeters in length and also has two long beards that help them detect their prey. This shark lives in deep water up to 310 meters depth, where there is no light.
Indonesian speckled carpetshark. Pic by http://gobiestogrizzlies.blogspot.com.es . The Indonesian speckled carpetshark is one of those few species of shark that "walks" on seabed pushing with their pectoral fins. This shark, from the bamboo shark family, measures up to 46 centimeters and can sometimes be seen in the waters of Raja Ampat (Indonesia).
The sharpnose sevengill shark (Heptranchias perlo), also known as one-finned shark, perlon shark, sevengill cow shark, sharpsnouted sevengill or slender sevengill, is a species of shark in the family Hexanchidae, and the only living species in the genus Heptranchias.
The third most endangered shark is the Bizant river shark, or the speartooth shark. Similar to the New Guinea river shark, they can be located in the tidal waters of Australia and New Guinea. This species has a short and broad snout, small eyes, and a large second dorsal fin.
Biologist Carl Linnaeus described the angular roughshark, O. centrina, in 1758. This name was later finalized and accepted by the scientific community as the official name for the species in 1976. Description and diet. At birth, they are less than 25 cm (9.8 in) and they mature at about 50 cm (20 in).
Smalltooth sand tiger (Odontaspis ferox) The smalltooth sand tiger. Pic by Arkive.org . The smalltooth sand tiger is a big shark related to the bull shark as they both belong to the Odontaspididae family. The smalltooth sand tiger can grow up to three meters long and has a large snout.
The pyjama shark or striped catshark (Poroderma africanum) is a species of catshark, and part of the family Scyliorhinidae, endemic to the coastal waters of South Africa. This abundant, bottom-dwelling species can be found from the intertidal zone to a depth of around 100 m (330 ft), particularly over rocky reefs and kelp beds.