Longtail Torpedo Ray, Tetronarce tokionis (Tanaka 1908)

Other Names: Slender Electric Ray, Trapezoid Torpedo

Longtail Torpedo Ray, Tetronarce tokionis. Source: CSIRO National Fish Collection. License: CC by Attribution

A small dark greyish-brown electric ray with a broadly-rounded disc, well-developed eyes and spiracles, rounded pelvic fins with well-developed anterior lobes, ans relatively firm, leathery skin. 

Cite this page as:
Dianne J. Bray, Tetronarce tokionis in Fishes of Australia, accessed 24 Jan 2019, http://fishesofaustralia.net.au/home/species/2736

Longtail Torpedo Ray, Tetronarce tokionis (Tanaka 1908)

More Info


Off Bowen, Queensland to off Newcastle, New South Wales, and off Shark Bay to off Rowley Shoals, Western Australia. Elsewhere the species has an antitropical distribution and occurs in the subtropical, north-west Pacific (Japan, Taiwan and New Zealand).
Inhabits stony, sandy or muddy bottoms on the continental shelf and slope.


Live bearer - aplacental viviparous (ovoviparous), with embryos feeding initially on yolk, then receiving additional nourishment from the mother by indirect absorption of uterine fluid enriched with mucus, fat or protein through specialised structures. Males mature by 67.5 cm total length (TL) and the females are larger. Size at birth is ~20.0 cm TL.

Species Citation

Tetronarcine tokionis Tanaka 1908, J. Coll. Sci., Imper. Univ. Tokyo 23(7): 2. Type locality: Tokyo Fish Market.


Dianne J. Bray


Australian Faunal Directory

Longtail Torpedo Ray, Tetronarce tokionis (Tanaka 1908)


Digital Fish Library Torpedo tokionis, University of California, San Diego. Accessed 23 November 2015 http://www.digitalfishlibrary.org/library/ViewSpecies.php?id=223

Ebert, D.A., Haas, D.L. & de Carvalho, M.R. 2015. Tetronarce cowleyi, sp. nov., a new species of electric ray from southern Africa (Chondrichthyes: Torpediniformes: Torpedinidae). Zootaxa 3936(2): 237-250. (as Tetronarce tokionis) DOI: http://dx.doi.org/10.11646/zootaxa.3936.2.4

Haas, D.L. & Ebert, D.A. 2006. Torpedo formosa sp. nov., a new species of electric ray(Chondrichthyes: Torpediniformes: Torpedinidae) from Taiwan. Zootaxa 1320: 1–14.

Haas, D.L., Ebert, D.A., Nakaya, K., Tanaka, S. & Orlov, A. 2009. Tetronarce tokionis. The IUCN Red List of Threatened Species 2009: e.T161676A5478248. http://dx.doi.org/10.2305/IUCN.UK.2009-2.RLTS.T161676A5478248.en. Downloaded on 23 January 2016.

Nakabo, T. (ed.) 2002. Fishes of Japan with pictorial keys to the species, English edition. Tokai University Press, Tokyo.

Nakaya, K. & Shirai, S. 1992. Fauna and zoogeography of deep-benthic Chondrichthyan fishes around the Japanese archipelago. Japanese Journal of Ichthyology 39: 37-48.

Tanaka, S. 1908. Notes on some Japanese fishes, with descriptions of fourteen new species. Journal of the College of Science, Imperial University, Tokyo, Japan 23(7): 1-54.

Quick Facts

CAAB Code:37028006

Behaviour:208-1,100 m; 410-735 m (AUS)

Conservation:IUCN Data Deficient

Danger:Produces electric shocks

Habitat:Bottom dweller

Max Size:114 cm TL

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CAAB distribution map