The needle-spined urchin, Diadema setosum, reported on 12 August 2006 from the southern coast of Turkey, is the first Erythrean alien echinoid to enter the Mediterranean Sea. Possible vectors include larval transport through the Suez Canal, shipping, and aquarium trade. The urchin’s venomous spines may cause painful injuries to swimmers.
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Baki Yokeş (2006) studied this question.
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