An echinothuriid sea urchin. The hooves on the spines are diagnostic for what Mortensen called asthenosomine echinothurioids. (This basically excludes only the Phormosoma group). Notice the dark tips of the aboral spines; these are venom-bearing tissues. There are 8 genera in the group with hooves on the spines the ambulacral plating strongly suggests a Sperosoma or a Tromikosoma. It seems that these echinothuriids from the Lavani site are all the same species (except for Phormosoma)

Item Type:Image
Creator(s):Gates, A.
Identification:Mooi, R
Date:04 June 2012
Classification:Kingdom Animalia > Phylum Echinodermata (Echinoderms) > Class Echinoidea (Sea Urchins, heart urchins, sand dollars) > Echinothuroidea (Sea urchins) > Echinothuriidae (Sea urchins)
Species:Sperosoma?, Tromikosoma?
Behaviour:Walking over the seabed
Site:Indian > Indian Ocean > East Africa > Lavani
Depth (m):2391
Countries:East Africa > Tanzania
Substratum:Deep-sea mud
Rig:Ocean Rig Poseidon
Project Partners:Statoil, Oceaneering
ROV:Millenium 93 and 73
Keywords:Echinothuriid Tanzania Indian Ocean Lavani
Deposited By:Dr Andrew Gates
Deposited On:13 November 2012

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