The narrownose chimaera (Harriotta raleighana) is a longnose chimaera of the family Rhinochimaeridae,[2] the longnose chimaeras, consisting of eight species belonging three genera.[3] This species is found in temperate seas worldwide, at depths between 200 and 3,100 m.[2] Its length is between 1.0 and 1.5 m, including a long, tapering snout and a long, filamentous tail.[4]
This species was first described by George Brown Goode and Tarleton Hoffman Bean in 1895.[5] The genus Harriotta refers to Thomas Harriot and the species name references Sir Walter Raleigh.[2][6]
Narrownose chimaeras have elongate rostra, slender tails, large pectoral and pelvic fins, large eyes, and two dorsal fins, the first being preceded by a mildly toxic spine.[3][6] They possess two pairs of non-replaceable tooth plates in the upper jaw and a one pair in the lower jaw.[7] Male H. raleighana are estimated to reach 62.8 cm (24.7 in) and female 75.8 cm (29.8 in) at maturity, respectively.[8]
The narrownose chimaera is found off Nova Scotia and in much of the rest of the Atlantic Ocean,[9] and in parts of the Pacific Ocean to depths of 3100 metres.[3] Very little is known of their biology due to their deep water habitats.[7]
Longnose chimaeras are members of the class Chondrichthyes, diverging from their closest relatives (sharks, rays, and skates) approximately 400 million years ago.[10] Like many other Chondrichthyes, longnose chimaeras reproduce by laying eggs.[8] Egg cases consist of a central chamber surrounded by a web-like structure.[7] Female longnose chimaeras lay a pair of eggs several times per season.[10]
The IUCN has classified this species as being of least concern.[1] In June 2018 the New Zealand Department of Conservation classified the narrownose chimaera as "Not Threatened" under the New Zealand Threat Classification System.[11]
Media related to Harriotta raleighana at Wikimedia Commons
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