Americorophium triaeonyx

Scientific Name:-
Americorophium triaeonyx

Common Name:-
Tube-dwelling amphipod

Malayalam Name:-




This animal is dull yellow in colour, found in coastal and estuarine ecosystems, often in tubes. They possess small, rounded and black eyes; 4-6 plumose setae on apex of 1st coxa; number of spines on outer margin of 4th peduncular article of female 2nd antenna 4-6; dactylus of gnathopod 2, tridentate; 2nd uropod longer than peduncle of uropod 1, uropod 3 uniramous and ramus rod like with 6 long median spines. The male is not distinctive, but the female is characterised by spines in antenna II, segment 4, which lie in a row of six or so along the lower edge and a row of two along the inner surface.



It is a hardy form and has been found to tolerate wide ranges in salinity (Shyamasundari, 1973).


Estuarine species distributed in Indian Ocean, Mozambique and South Africa. This pelagic and benthic species feeds on detritus.


Corophium triaenonyx Stebbing, 1904 (basionym)
Corophium crassicorne Walker 1904
Corophium crassicorne Chilton 1921


Griffiths, C.L. (1973). The amphipoda of Southern Africa. I. The Gammaridea and Caprellidea of southern Moçambique. Annals of the South African Museum, 60(10): 265-306.
Kumar, R.S. (1995) Macrobenthos in the mangrove ecosystem of Cochin backwaters, Kerala (southwest coast of India). Indian Journal of Marine Sciences, 24: 56-61.
Lyla, P.S., Velvizhi, S. and Ajmal Khan, S. (1998). Brackishwater amphipods of Parangipettai coast. Centre of Advanced Study in Marine Biology, Annamalai University, Parangipettai, 79 pp.
Nair, K.K.C., Gopalakrishnan, T.C., Venugopal, P., Peter, M.G., Jayalakshmi, K.V. and Rao, T.S.S. (1983). Population dynamics of estuarine amphipods in Cochin backwaters. Marine Ecology Progress Series, 10: 289-295.
Sarala Devi, K., Jayalakshmi, KV and Venugopal, P. (1991). Communities and coexistance of benthose in northern limb of Cochin backwaters. Indian Journal of Marine Sciences, 20: 249-254.
Shyamasundari, K. (1973). Studies on the tube-building amphipod Corophium triaenonyx Stebbing from Visakhapatnam Harbor: Effect of salinity and temperature. Biological Bulletin, 144 (3): 503-510.
World Register of Marine Species (WoRMS). Available at - http://www.marinespecies.org (assessed on 17th December 2012)

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