Family Pseudotriakidae Gollumsharks and False Catsharks
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Transcript of Family Pseudotriakidae Gollumsharks and False Catsharks
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Family PseudotriakidaeGollumsharks and False Catsharks
Sara McCutcheon
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General Characteristics
• Small to large sharks• No barbels or nasoral
grooves• Labial furrows short• Elongated eyes
“squinty” appearance• Deep groove in front
of eyes
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Gollum spp.3 species
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Pseudotriakis microdon
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Pygmy False CatsharkNew Genus and species
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Distribution and Habitat
• Continental and insular slopes and ocassionaly over shelves
• Benthic and benthopelagic• Bathydemersal• No recognized fossil record for this family
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Gollum spp• 129-724m; 300-600m
common• Bathydemersal• 10˚C • G. attenuatus New
Zealand • G. species A –
Philippines• G. species B – New
Caledonia
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Pseudotriakis microdon
• Found between 200-1890m
• Wide-ranging• Not yet found in the S
Atlantic or E Pacific
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False Pygmy Catshark
• Arabian Sea and Maldives (NW Indian Ocean)
• Down to 1120m
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Biology• First documented report of non-lamnid oophagy• Matrophagy, oophagy, and uterine milk• Aplacental vivaparity • Embryos feed on yolk sac, ova, and uterine milk
– Consumed ova replenish external yolk sac• Low fecundity of 2 pups/litter• Ratio of males to females 1:1• Pseudotriakis microdon
– 20,000 ova (9mm) found in a 280cm female – Unknown gestation time; thought to be at least one
year, possibly 2-3 years
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Diet
• Feed on sharks, teleosts, gastropods, cephalopods, crustaceans, and other invertebrates
• Most important are fish and crustaceans• Feed at or near the bottom• P. microdon in Pacific vs Atlantic
– Pacific = sharks, teleosts, squid, octopi– Atlantic = human garbage, potatoes, pear,
plastic bag, and soda can
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Status• No interest by fisheries• Caught as bycatch from bottom trawl longlines• Thought to have a low resilience; minimum
population doubling time of 14 years• No information of population size or status• Considered harmless to humans• Gollum spp. – species of least concern• Pseudotriakis microdon - data deficient• Pygmy False Catshark – Not evaluated
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Bibliography• Carrier, J.C., J.A. Musick, and M.R. Heithaus. 2004. Biology of Sharks and
their Relatives. CRC Press, Boca Raton, FL. pp. 49 and 71.• Castro, J.I. 1983. The Sharks of North American Waters. Texas A&M
University Press, TX. p. 113.• Compagno, LJV. 1984. FAO Species Catalogue, Vol 4. Sharks of the World.
An annotated and illustrated catalogue of shark species known to date. Part 2 – Carcharhinigormes. FAO Fish. Synop. 125 (4/2):251-655.
• Compagno, L, M. Dando, and S. Fowler. 2005. Sharks of the World. Princeton University Press, Princeton, NJ. pp. 257-260.
• Francis, M.P. 2003. Gollum attenuatus. In: IUCN 2007. 2007 IUCN Red List of Threatened Species. www.iucnredlist.org. Downloaded on 21 October 2007.
• Kyne, P.M., Kazunari Yano & White, W.T. 2004. Pseudotriakis microdon. In: IUCN 2007. 2007 IUCN Red List of Threatened Species. www.iucnredlist.org. Downloaded on 21 October 2007.
• Nelson, J.S. 2006. Fishes of the World, 4th ed. John Wiley and Sons, Inc, NJ. p. 61.