Natal shyshark
The Natal shyshark, eastern shyshark or happy chappie is a species of shark belonging to the family Pentanchidae, the deepwater catsharks. It was once regarded as the "Natal" form of the puffadder shyshark. This shark is endemic to a small area off South Africa from the Western Cape to KwaZulu-Natal. It is found close to the coast, from the surf zone to a depth of, and has benthic habits. Reaching in length, the Natal shyshark is similar to the puffadder shyshark in appearance but has a stockier body, less flattened head, a compressed caudal peduncle, and a different color pattern. Rare and under threat from habitat degradation and commercial fishing, it has been assessed as Vulnerable by the International Union for Conservation of Nature.
Taxonomy
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. 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. They named it after South African shark researcher Nat Kistnasamy, the Natal shyshark's original discoverer.Distribution and habitat
The distribution of the Natal shyshark is restricted to the waters off the KwaZulu-Natal, and possibly also the Western Cape and Eastern Cape Provinces of South Africa. Its total range is estimated to encompass an area of under. A benthic species, it can be found in the surf zone and on shallow rocky reefs. As opposed to the puffadder shyshark, which inhabits deeper, cooler waters in the northeastern parts of its range, in those areas the Natal shyshark occurs in warm inshore waters at a depth of.Description
The Natal shyshark closely resembles the puffadder shyshark, but has a more robust body, a less flattened head, and a laterally compressed caudal peduncle. The snout is broad and rounded, with very large nostrils and greatly expanded, triangular nasal skin flaps that reach the mouth. There are a pair of deep grooves, covered by the nasal flaps, that run from the excurrent openings of the nostrils to the mouth. The mouth has furrows at the corners on both jaws, and contains teeth with 3-5 points. The eyes are large, with a rudimentary nictitating membrane and a prominent ridge beneath. The five gill slits are positioned somewhat dorsally on the body.The dorsal, pelvic, and anal fins are of roughly equal size. The dorsal fins are placed far back on the body, with the first originating behind the pelvic fin origins and the second originating behind the anal fin origins. The pectoral fins are moderately large. The short and broad caudal fin has a ventral notch on the upper lobe and an indistinct lower lobe. The skin is thick, bearing well-calcified leaf-shaped dermal denticles. The back is brown, with a distinctive pattern of H-shaped, dark brown saddles with well-defined margins, along with numerous small white dots and darker mottling between the saddles. This species attains a length of.