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Psammechinus miliaris
''Psammechinus miliaris'' is a species of sea urchin in the family Parechinidae. It is sometimes known as the green sea urchin or shore sea urchin. It is found in shallow areas of the eastern Atlantic Ocean and the North Sea.
==Description==
''P. miliaris'' can reach a diameter of .〔 The test is globular, somewhat flattened dorso-ventrally, and up to five centimetres in diameter. It is covered in short, equi-length robust spines. The test and spines of shallow water specimens are purplish-brown but specimens from deeper water have a greenish test and pale coloured spines with purple tips. If individuals are transferred from one depth range to another, they retain their original colouration in their new location.〔(Ecology of ''Psammechinus miliaris'' ) Google Books. Retrieved 2011-08-25.〕 On each ambulacral plate there are three pairs of tubercles each with a spine attached, the central one being a primary spine. On the ventral side, the orifices are relatively small and the buccal membrane is closely packed with thick plates with many pedicellariae but no spines. The globiferous pedicellariae are numerous but small and the tridentate pedicellariae are stout with broad blades.〔(Shore Sea Urchin (Psammechinus miliaris) ) Marine Species Identification Portal. Retrieved 2011-08-26.〕
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