|Distribution of Iphinoe trispinosa|
I. trispinosa is a slender cumacean which grows up to 10 mm long. The carapace is approximately twice as long as it is high, and in the male, which has a rounded pseudorostrum, rather smooth. The female has two to six small serrations in the middle of the dorsal ridge of the carapace, and a sharply leading pseudorostrum.
Both males and females are strongly pigmented. The male has — like all members of the family Bodotriidae — five pairs of pleopods. Their colour is whitish to straw-coloured.
I. trispinosa are usually found in fine sand beaches, such as those formed by silt deposits. They prefer shallower depths, but may be found as deep as 150 m. During summer nights the males emerge from sand, swarming to the surface, frequently attracted by light. They are found from Norway to the Moroccan coast, around the Canary Islands and in the Mediterranean Sea.
- H. D. S. Goodsir (1843). "Description of the genus Cuma, and of two new genera nearly allied to it". Edinburgh New Philosophical Journal. 34: 119–129 pls 2–3.
- Corbera, J.; Garcia-Rubies, A. (1998). "Cumaceans (Crustacea) of the Medes Islands (Catalonia, Spain) with special attention to the genera Bodotria and Iphinoe" (PDF). Sci. Mar. 62 (1–2): 101–112. Retrieved 2007-09-10.
- Hayward, P.J. & Ryland, J.S., (1991). Marine Fauna of the British Isles and North-West Europe: Introduction and Protozoans to Arthropods, ISBN 0-19-857356-1.
- Jones, N.S., (1976). British Cumaceans. Synopses of the British fauna (New Series), No. 7. The Linnean Society/Academic Press, London.
- Sars, G.O., (1900). An account of the Crustacea of Norway. Vol. III. Cumacea. Bergen Museum, Bergen.
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