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The first shark-like chondrichthyans appeared in the oceans 400 million years ago, [1] developing into the crown group of sharks by the Early Jurassic. [2] Listed below are extant species of shark. Sharks are spread across 512 described and 23 undescribed species in eight orders. The families and genera within the orders are listed in ...
The dark shyshark or pretty happy (Haploblepharus pictus) is a species of shark belonging to the family Pentanchidae, the deepwater catsharks. This species is endemic to the temperate waters off southern Namibia and western South Africa. It is benthic in nature and inhabits shallow, inshore waters and favors rocky reefs and kelp forests ...
[3] [4] [5] In 1913, American zoologist Samuel Garman created the new genus Haploblepharus for this and other shyshark species. [6] Two forms of puffadder shyshark were once recognized: "Cape" and "Natal", which differed in appearance and habitat preferences. In 2006, the "Natal" form was described as a new species, the Natal shyshark. [7]
This species was once considered to be the "Natal" form of the puffadder shyshark, which differed from the main "Cape" form in appearance and habitat preferences. [2] In 2006, Brett A. Human and Leonard J.V. Compagno formally described this shark as a new species, in an article published in the scientific journal Zootaxa.
Kitefin sharks are small, under 2 m (6.6 ft) long, and are found worldwide. They have cigar-shaped bodies with narrow heads and rounded snouts. Several species have specialized bioluminescent organs. [11] The term kitefin shark is also used as the common name for the type species of the family, Dalatias licha. Echinorhinidae: Bramble sharks: 1 2
Sharks in the sawshark family (Pristiophoridae) are similar to the sawfish (family Pristidae) in their saw-like snout, but are smaller and have the basic structural plan of sharks rather than rays. Distinguishing features include a slight compression of their body and strong flattening of their head, and they tend to reach maturity at around ...
The smooth lanternshark or slender lanternshark (Etmopterus pusillus) is a species of dogfish shark in the family Etmopteridae, found widely in the Atlantic and Pacific Oceans. It inhabits benthic environments at a depth of 274–1,000 m (899–3,281 ft), and pelagic environments at a depth of 0–708 m (0–2,323 ft).
Springer's sawtail catshark (Galeus springeri) is a species of shark belonging to the family Pentanchidae, the deepwater catsharks. This shark is found in waters 457–699 m (1,499–2,293 ft) deep off the islands of the Antilles, from Cuba to the Leewards. A small, slim-bodied species reaching a length of 48 cm (19 in), the Springer's sawtail ...