Naxos (Greece) Two specimen of Paracentrotus lividus: on the right a rare black specimen. The rare blacks specimens can be confused with Arbacia lixula but the white circular outline on the base of the spines are a features exclusive of P. lividus.
Naked test of Paracentrotus lividus from Agay (French Mediterranean). Frédéric Ducarme. License : CC by-sa 4.0 (https://commons.wikimedia.org/wiki/File:Paracentrotus_lividus_test.jpg?uselang=fr)
Vice county name: West Cork. Vice county no.: H03. Country: Eire. Identified by: Malcolm Storey. Category: standard photograph or close-up. Photographic equipment used: "35mm transparencies (on a variety of films, but Agfa CT18 in the 1960's to early 1980's followed by Fujichrome in the late 1980's.) Transparencies scanned with Minolta Dimage Scan Dual II AF-2820U transparency scanner.".