Abstract
Here we describe the new species Chironex yamaguchii (Cnidaria: Cubozoa) from the Ryukyu Archipelago, Japan. This highly venomous cubomedusa, commonly referred to as Habu-kurage in Japan, is the culprit for several fatalities in Japanese waters. The scientific name adopted for this species in the literature is Chiropsalmus quadrigatus, but our taxonomic investigations show that this represents a case of mistaken identity. In fact, Habu-kurage is a close relative of Chironex fleckeri, which is particularly interesting because the latter has a reputation for being the most venomous animal known. Differences in the shape of the pedalial canal bend, the number of tentacles, and bell size distinguish the two species. In addition to Japan, Chironex yamaguchii is widely distributed in the Philippines.References
Barnes, J.H. (1966) Studies on three venomous Cubomedusae. In: Rees, W.J. (Ed.), The Cnidaria and their evolution. Symposia of the Zoological Society of London, 16, 307–332.
Fenner, P.J. (1997) The global problem of cnidarian (jellyfish) stinging. M.D. Thesis, University of London. Available from: www.marine-medic.com.au (accessed 30 January 2009)
Gershwin, L.A. (2006a) Nematocysts of the Cubozoa. Zootaxa, 1232, 1–57.
Gershwin, L.A. (2006b) Comments on Chiropsalmus (Cnidaria: Cubozoa: Chirodropida): a preliminary revision of the Chiropsalmidae, with descriptions of two new genera and two new species. Zootaxa, 1231, 1–42.
Haeckel E. (1880) System der Acraspeden - Zweite Hälfte des Systems der Medusen. Denkschriften der Medizinisch-Naturwissenschaftlichen Gesellschaft zu Jena, Jena.
Kawamura, M., Ueno, S., Iwanga, S., Oshiro, N. & Kubota, S. (2003) The relationship between fine rings in the statolith and growth of the cubomedusa Chiropsalmus quadrigatus (Cnidaria: Cubozoa) from Okinawa Island, Japan. Plankton Biology and Ecology, 50, 37–42.
Koyama, T., Noguchi, K., Matsuzaki, T., Sakanashi, M., Nakasone, J., Miyagi, K., Sakanashi, M., Sakanashi, M. (2003) Haemodynamic effects of the crude venom from the nematocysts of the box-jellyfish Chiropsalmus quadrigatus (Habu-kurage) in anaestized rabbits. Toxicon, 41, 621–31.
Light, S.F. (1914a) Another dangerous jellyfish in Philippine waters. Philippine Journal of Science, 9, 291–295.
Light, S.F. (1914b) Some Philippine Scyphomedusae, including two new genera, five new species, and one new variety. Philippine Journal of Science, 9, 195–231.
Light, S.F. (1921) Further notes on Philippine scyphomedusan jellyfishes. Philippine Journal of Science, 18, 25–45
Mayer, A.G. (1910) Medusae of the World, Vol III. The Scyphomedusae. Carnegie Institution of Washington, Washington, DC.
Mayer, A.G. (1915) Medusae of the Philippines and Torres Straits. Being a report on the Scyphomedusae collected by the U.S. Fisheries Bureau steamer ‘Albatross’ in the Philippine Islands and Malay Archipelago, 1907–1910, and upon the medusa collected by the expedition of the Carnergie Institution of Washington to Torres Straits, in 1913. Papers from the Tortugas Laboratory of the Carnegie Institution of Washington, 8, 157–202.
Mayer, A.G. (1917) Report upon the Scyphomedusae collected by the U.S. Bureau of Fisheries Steamer "Albatross" in the Philippine and Malay Archipelago. Bulletin of the United States National Museum, 100, 175–233.
Nagai, H., Takuwa-Kuroda, K., Nakao, M., Oshiro, N., Iwanaga, S. & Nakajima, T. (2002) A novel protein toxin from the deadly box jellyfish (sea wasp, Habu-kurage) Chiropsalmus quadrigatus. Bioscience, Biotechnology, and Biochemistry, 66, 97–102.
Nagai, H. (2003) Progress in jellyfish toxin study. Journal of Health Science, 49, 337–340
Noguchi, K., Sakanashi, M., Matsuzaki, T., Nakasone, J., Sakanashi, M., Koyama, T., Hamadate, N.& Sakanashi M. (2005) Cardiovascular effects and lethality of venom from nematocysts of the box-jellyfish Chiropsalmus quadrigatus (Habu-kurage) in anaesthetized rats. Toxicon, 45, 519–26.
Oba, A., Hidaka, M. & Iwanaga, S. (2004) Nematocyst composition of the cubomedusan Chiropsalmus quadrigatus changes with growth. Hydrobiologia, 530/531, 173–177.
Okinawa Prefectural Institute for Health and Environment (1999) Kaiyo Kiken Seibutsu Taisakujigyo Houkokusho, Okinawa, pp. 1–17 [in Japanese]
Sakanashi, M., Matsuzaki, T., Nakasone, J., Koyama, T., Sakanashi, M., Kukita, I. & Sakanashi, M. (2002) Effects of diltiazm on in vitro cardiovascular actions of crude venom obtained from Okinawan box-jellyfish (Habu-kurage), Chiropsalmus quadrigatus. Anaesthesia and Intensive Care, 30, 570–577.
Southcott, R.V. (1956) Studies on Australian Cubomedusae, including a new genus and species apparently harmful to man. Australian Journal of Marine and Freshwater Research, 7, 254–280.
Stiasny, G. (1931) Die Rhizostomen-Sammlung des British Museum (Natural History) in London. Zoologische Mededelingen, 14, 137–178.
Stiasny, G. (1937) Scyphomedusae. John Murray Expedition 1933–1934, Scientific Reports, 4, 203–242.
Thiel, M.E. (1928) Die Scyphomedusen des Zoologischen Staatsinstituts und Zoologischen Museums in Hamburg: I, Cubomedusae, Stauromedusae und Coronatae. Mitteilungen aus dem Zoologischen Museum Hamburg, 43, 1–34.
Williamson, J.A., Fenner, P.J., Burnett, J.W. & Rifkin, J. (1996) Venomous and poisonous marine animals: a medical and biological handbook. Surf Life Saving Australia and University of New South Wales Press Ltd, Sydney.
Yamaguchi, M. (1982) Cubozoans and their life history. Kaiyou to seibutsu, 21, 248–254 [in Japanese with English abstract]