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Pseudotriakis acrales by jordan and snyder.jpg
False catshark
(Pseudotriakis microdon)
Gollum attenuatus (Slender smooth-hound).gif
Slender smooth-hound
(Gollum attenuatus)
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Chondrichthyes
Subclass: Elasmobranchii
Superorder: Selachimorpha
Order: Carcharhiniformes
Family: Pseudotriakidae
T. N. Gill, 1893

The Pseudotriakidae are a small family of ground sharks, belonging to the order Carcharhiniformes, containing the false catsharks (genera Pseudotriakis and Planonasus) and gollumsharks (genus Gollum). It contains the only ground shark species that exhibit intrauterine oophagy, in which developing fetuses are nourished by eggs produced by their mother.[1]

Undescribed species[edit]

Two as yet undescribed species are known - one in the genus Gollum, (Gollum sp. B) - the white-marked gollumshark, and the pygmy false catshark of undetermined genus which may be close to Planonasus parini.[2][3]


  1. ^ a b Froese, Rainer, and Daniel Pauly, eds. (2012). "Pseudotriakidae" in FishBase. December 2012 version.
  2. ^ Compagno, L.J.V., M. Dando and S. Fowler (2005). Sharks of the World. Princeton University Press. pp. 257–260. ISBN 978-0-691-12072-0. 
  3. ^ Weigmann, S., Stehmann, M.F.W. & Thiel, R. (2013): Planonasus parini n. g. and n. sp., a new genus and species of false cat sharks (Carchariniformes, Pseudotriakidae) from the deep northwestern Indian Ocean off Socotra Islands. Zootaxa, 3609 (2): 163–181.