sea slater

noun

a large (2.5 cm or 1 in.) nocturnal isopod, Ligea oceanica, that lives in cracks in rocks or walls around the high-water mark

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012