The Pseudotriakidae are a small
family
Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ...
of
ground shark
Ground may refer to:
Geology
* Land, the solid terrestrial surface of the Earth
* Soil, a mixture of clay, sand and organic matter present on the surface of the Earth
Electricity
* Ground (electricity), the reference point in an electrical circ ...
s, belonging to the order Carcharhiniformes, containing the false catsharks (genera ''
Pseudotriakis'' and ''
Planonasus
''Planonasus'' is a genus of ground sharks in the family Pseudotriakidae, native to the western Indian Ocean.
Species
There are currently two species in this genus:
* ''Planonasus parini'' (Simon Weigmann, Weigmann, Matthias Stehmann, Stehman ...
'') and gollumsharks (genus
''Gollum''). It contains the only ground shark species that exhibit intrauterine
oophagy
Oophagy ( ) or ovophagy, literally "egg eating", is the practice of
embryos feeding on eggs produced by the ovary while still inside the mother's uterus. The word oophagy is formed from the classical Greek (, "egg") and classical Greek (, "to ...
, in which developing
fetus
A fetus or foetus (; : fetuses, foetuses, rarely feti or foeti) is the unborn offspring of a viviparous animal that develops from an embryo. Following the embryonic development, embryonic stage, the fetal stage of development takes place. Pren ...
es are nourished by eggs produced by their mother.
Genera
The Pseudotriakidae contains the following genera:
Undescribed species
One undescribed species is known - one in the genus ''Gollum'', (''Gollum'' sp. B) - the white-marked gollumshark.
[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.'']
References
Shark families
Taxa named by Theodore Gill
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