The
hooktooth dogfish,
Aculeola nigra, is a small, little known
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...
, the only member of the
genusIn biology, a genus is a taxonomic unit used in the classification of living and fossil organisms. The term comes from Latin genus "descent, family, type, gender" , cognate with – genos, "race, stock, kin" ..In addition, genus is a taxonomic rank in the hierarchy In biology, a genus (plural:...
Aculeola.
The type specimen is held at the National Natural History Museum,
SantiagoSantiago , is the capital and largest city of Chile, and the centre of its largest conurbation . It is located in the country's central valley, at an elevation of 520 m AMSL...
,
ChileChile, officially the Republic of Chile , is a country in South America occupying a long, narrow coastal strip between the Andes mountains to the east and the Pacific Ocean to the west. It borders Peru to the north, Bolivia to the northeast, Argentina to the east, and the Drake Passage in the far...
.
Hooktooth dogfish have a blunt flattened snout, very large eyes, a relatively long distance from the eye to the first gill slit, small grooved dorsal spines, a first dorsal fin about halfway between the pectoral and pelvic fins, and a broad caudal fin.
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The
hooktooth dogfish,
Aculeola nigra, is a small, little known
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...
, the only member of the
genusIn biology, a genus is a taxonomic unit used in the classification of living and fossil organisms. The term comes from Latin genus "descent, family, type, gender" , cognate with – genos, "race, stock, kin" ..In addition, genus is a taxonomic rank in the hierarchy In biology, a genus (plural:...
Aculeola.
The type specimen is held at the National Natural History Museum,
SantiagoSantiago , is the capital and largest city of Chile, and the centre of its largest conurbation . It is located in the country's central valley, at an elevation of 520 m AMSL...
,
ChileChile, officially the Republic of Chile , is a country in South America occupying a long, narrow coastal strip between the Andes mountains to the east and the Pacific Ocean to the west. It borders Peru to the north, Bolivia to the northeast, Argentina to the east, and the Drake Passage in the far...
.
Physical characteristics
Hooktooth dogfish have a blunt flattened snout, very large eyes, a relatively long distance from the eye to the first gill slit, small grooved dorsal spines, a first dorsal fin about halfway between the pectoral and pelvic fins, and a broad caudal fin. They are black with a maximum length of only 60 cm.
Distribution
They are found in the Eastern South Pacific along the coast of
South AmericaSouth America is the southern continent of the Americas, situated entirely in the Western Hemisphere and mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere...
from
PeruPeru , officially the Republic of Peru , is a country in western South America. It is bordered on the north by Ecuador and Colombia, on the east by Brazil, on the southeast by Bolivia, on the south by Chile, and on the west by the Pacific Ocean.Peruvian territory was home to the Norte Chico...
to central
ChileChile, officially the Republic of Chile , is a country in South America occupying a long, narrow coastal strip between the Andes mountains to the east and the Pacific Ocean to the west. It borders Peru to the north, Bolivia to the northeast, Argentina to the east, and the Drake Passage in the far...
.
Habits and habitat
This shark is a little-known yet common shark that lives between 110 and 560 m. They are
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 at least 3 pups per litter. They probably eat bony fish and
invertebrateAn invertebrate is an animal without a vertebral column. The group includes 95% of all animal species — all animals except those in the Chordate subphylum Vertebrata ....
s.