Slender smooth-hound journal "Transactions of the Royal Society of New Zealand". Garrick named the species "Triakis attenuata", in reference to its extremely slender ("attenuate") body. In 1973, Leonard Compagno proposed a separate genus for the slender smooth-hound: "Gollum", after the character in J. R. R. Tolkien's "The Lord of the Rings", "to whom this shark bears some resemblance in form and habits." He placed "Gollum" with the finback catsharks (Proscylliidae), but also noted its many anatomical similarities to the false catshark ("Pseudotriakis microdon"). At the time, Compagno chose to maintain "Pseudotriakis" as the sole member of the family Pseudotriakidae because of its
Humpback smooth-hound the three species it is the humpback smooth-hound that is the main target of the tollo fishery in Peru. Landings averaging 11,000 tons of tollo per year were made in that country between 1965 and 1989, but quantities caught diminished thereafter. A minimum size requirement of was set in 2001 but was pitched so low as to have limited conservation effect. The International Union for Conservation of Nature (IUCN) has rated the status of the humpback smooth-hound as being "vulnerable" and considers more should be done to publicise and enforce the size limit. Humpback smooth-hound The humpback smooth-hound ("Mustelus whitneyi")