The
rough longnose shark,
Deania hystricosa, is a little-known deepwater
dogfishDogfish can have many meanings, but usually refers to a type of shark:* A shark belonging to the order Squaliformes, or to one of its constituent families:* Family Centrophoridae * Family Dalatiidae...
.
Rough longnose dogfish have an extremely long snout, no anal fin, small grooved
dorsalIn anatomy, the dorsum is the upper side of animals that typically run, fly, or swim in a horizontal position, and the back side of animals that walk upright. In vertebrates the dorsum contains the backbone. The term dorsal refers to anatomical structures that are either situated toward or grow...
spines, and rough pitchfork-shaped dermal denticles. The first
dorsal finA dorsal fin is a fin located on the backs of some fish, whales, dolphins, and porpoises, as well as the ichthyosaurs. Depending on the species, an animal can have up to three of them. Its main purpose is to stabilize the animal against rolling and assist in sudden turns...
is long and narrow. Maximum length is 109 cm.
Found in the Eastern Atlantic around
MadeiraMadeira is a Portuguese archipelago in the mid Atlantic Ocean that lies between and . It is one of the Autonomous regions of Portugal, with Madeira Island and Porto Santo Island being the only inhabited islands...
and in the western Pacific around southern
Japanis an island country in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, People's Republic of China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south...
.
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The
rough longnose shark,
Deania hystricosa, is a little-known deepwater
dogfishDogfish can have many meanings, but usually refers to a type of shark:* A shark belonging to the order Squaliformes, or to one of its constituent families:* Family Centrophoridae * Family Dalatiidae...
.
Rough longnose dogfish have an extremely long snout, no anal fin, small grooved
dorsalIn anatomy, the dorsum is the upper side of animals that typically run, fly, or swim in a horizontal position, and the back side of animals that walk upright. In vertebrates the dorsum contains the backbone. The term dorsal refers to anatomical structures that are either situated toward or grow...
spines, and rough pitchfork-shaped dermal denticles. The first
dorsal finA dorsal fin is a fin located on the backs of some fish, whales, dolphins, and porpoises, as well as the ichthyosaurs. Depending on the species, an animal can have up to three of them. Its main purpose is to stabilize the animal against rolling and assist in sudden turns...
is long and narrow. Maximum length is 109 cm.
Found in the Eastern Atlantic around
MadeiraMadeira is a Portuguese archipelago in the mid Atlantic Ocean that lies between and . It is one of the Autonomous regions of Portugal, with Madeira Island and Porto Santo Island being the only inhabited islands...
and in the western Pacific around southern
Japanis an island country in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, People's Republic of China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south...
. This shark is rarely seen but lives between 600 and 1,000 m. It is
ovoviviparousOvoviviparity, ovovivipary, or ovivipary, is a mode of reproduction in animals in which embryos develop inside eggs that are retained within the mother's body until they are ready to hatch...
with probably around 12 pups per litter.