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Pseudotriakis microdon

(Requin ? Longue Dorsale)


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Family : False catsharks ; Found on the continental and insular slopes , occasionally wandering onto continental shelves[1]. Inactive and sluggish[1]. Probably eats bony fishes, elasmobranchs and invertebrates [2]. Ovoviviparous, embryos feeding on yolk sac and other ova produced by the mother, uterine milk is consumed additionally[3]. Utilization not recorded[1].

Common Names

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Click on the language to view common names.

Common Names in Arabic:


Common Names in Bali:

Hiu Tahu

Common Names in Chinese:

啞巴鮫, 擬皺唇鯊屬

Common Names in Danish:


Common Names in Dutch:

Valse kathaai

Common Names in English:

Atlantic false catshark, false cat shark, False catshark, Keel dorsal Shark, Keel-dorsal shark, Mona

Common Names in Finnish:

Atlantinsyv, Atlantinsyvännehai, Okahammashai

Common Names in French:

Requin ? Longue Dorsale, Requin , Requin à longue dorsale

Common Names in German:

atlantischer falscher Marderhai, Falscher Marderhai

Common Names in Hungarian:


Common Names in Icelandic:

Kambh, Kambháfur

Common Names in Japanese:


Common Names in Mandarin Chinese:

哑巴鲛, 啞巴鮫, 小齒擬皺唇鯊, 小齿拟皱唇鲨, 黑沙, 黑边拟皱唇鲨, 黑邊擬皺唇鯊

Common Names in Portuguese:

Mam, Mamôna, Mona, Peixe carago, Peixe-carago

Common Names in Russian:

акула лож, акула ложная кулья

Common Names in Spanish:

Musol?n De Aleta Larga, Falsa gata, Musol, Musolón aleta larga, Musolón de aleta, Musolón de aleta larga

Common Names in Spanish, Castilian:

Falsa gata, Musolón aleta larga, Musolón de aleta, Musolón de aleta larga

Common Names in Swedish:



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Typically found in water with a depth of 0 to -3,812 meters (0 to -12,507 feet).[4]

Biome: Marine .

Ecology: A large deepwater benthic shark recorded from depths of 200 to 1,890 m on the continental and insular slopes , including around seamounts , troughs and deepwater reefs. This species is occasionally recorded on the continental shelves including in shallow water. This may be abnormal behaviour or where submarine canyons extend close to shore (Compagno in prep. b ). The anatomy of this shark (large body cavity , soft fins , musculature and skin ) suggests an inactive and sluggish lifestyle (Compagno in prep. b).

Maximum size 296 cm total length (TL ) (female), 295 cm TL (male) (Yano 1992); mature individuals 200 to 269 cm TL (males), 212 to 295 cm TL (females) (Compagno in prep. b). Taniuchi et al. (1984) observed near-term embryos of 112 and 113 cm TL, and Yano (1992) at 116 to 120 cm TL. A 156 cm TL immature female had an umbilical scar (Yano 1992). Size at birth 120 to 150 cm TL (Yano, unpubl. data ).

Forster et al. (1970) suggested that P. microdon was oophagous based on the large number of ova (estimated at 20,000) of 9 mm mean diameter observed in the ovary of a 280 cm TL female. Taniuchi et al. (1984) reported mid-term and near-term embryos with stomachs full of yolk . Yano (1992) confirmed the existence of oophagy in this species showing that embryos ingest and utilise yolk material from ovulated ova. Yolk material was observed in the uteri of gravid females and the stomachs of two embryos contained yolk material and egg capsules. Yano (1992) reported that the reproductive mode in this species is a modified form of oophagy in which embryos appear to transfer yolk from ingested egg fragments to their external yolk sac , replenishing external yolk sac reserves and using them in the last stages of gestation . Reported litter size of this species is two (Taniuchi et al. 1984, Yano 1992, Stewart 2000) but may be four according to Compagno (in prep. b). Gestation period is unknown, but is presumed to be > 1 year and possibly more than two or three years (Yano unpublished data).

Yano and Musick (1992) found that this species feeds predominantly on teleost fishes (52.8% frequency of occurrence in North Pacific specimens, 80% in South Pacific specimens). Other prey items included etmopterid sharks , squid and octopi. Its very large mouth may allow prey items of considerable size to be ingested (Compagno in prep. b). False catsharks have been photographed in the Indian Ocean (feeding on teleosts used as bait on the camera ) and from a submersible off the Hawaiian Islands (feeding on heterocarpid prawns at the entrance to a trap) (Compagno in prep. b).[5].

List of Habitats :


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Pseudotriakis acrages Jordan & Snyder • Pseudotriakis acralesPseudotriakis acrales Jordan & Snyder • Pseudotriakis microdon Capello • Pseudotriakis microdon Capello, 1867 • Pseudotriakis microdon Capello, 1868 • Pseudotriakis microdon de Brito Capello, 1868


Name Status: Accepted Name .

Comment: Author and year from Eschmeyer56787 .

Last scrutiny: Data last modified by FishBase 28-Oct-2000

Yano and Musick (1992) showed that morphometric characters used to separate Pacific Pseudotriakis acrales Jordan & Snyder, 1904 from Atlantic P. microdon Capello, 1868 did not differ significantly, and these authors confirmed P. acrales as a junior synonm of P. microdon. Pseudotriakis is thus a mono-specific genus.[5].

Similar Species

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Members of the genus Pseudotriakis

ZipcodeZoo has pages for 2 species and subspecies in this genus:

P. acrales (Pseudotropheus Ice Blue) · P. microdon (Atlantic False Catshark)

More Info

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Further Reading

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Data Sources

Accessed through GBIF Data Portal March 01, 2008:



  1. Compagno, L.J.V. (1998). Pseudotriakidae. False catsharks. p. 1296. In K.E. Carpenter and V.H. Niem (eds.) FAO identification guide for fishery purposes. The Living Marine Resources of the Western Central Pacific. FAO, Rome. [back]
  2. Compagno, L.J.V. (1984). FAO species catalogue. Vol. 4. Sharks of the world. An annotated and illustrated catalogue of shark species known to date. Part 2. Carcharhiniformes. FAO Fish. Synop. (125, Vol. 4, Part 2), 655 p. [back]
  3. Dulvy, N.K. and J.D. Reynolds (1997). Evolutionary transitions among egg-laying, live-bearing and maternal inputs in sharks and rays. Proc. R. Soc. Lond. B 264:1309-1315. [back]
  4. Mean = -1,974.500 meters (-6,478.018 feet), Standard Deviation = 2,107.490 based on 8 observations. Ocean depth information for each observation from British Oceanographic Data Centre. [back]
  5. Kyne, P.M., Kazunari Yano & White, W.T. 2004. Pseudotriakis microdon. In: IUCN 2011. IUCN Red List of Threatened Species. Version 2011.2. <>. Downloaded on 04 February 2012. [back]
Last Revised: 2014-11-21