TY - JOUR T1 - Where’s Waldo? A new commensal species, Waldo arthuri (Mollusca, Bivalvia, Galeommatidae), from the Northeastern Pacific Ocean JF - ZooKeys JO - ZK M3 - 10.3897/zookeys.316.4256 VL - 316 AU - Valentich-Scott, Paul AU - O'Foighil, Diarmaid AU - Li, Jingchun Y1 - 12/07/2013 UR - https://doi.org/10.3897/zookeys.316.4256 N2 - A galeommatid bivalve mollusk, representing a new species, is described from off the coasts of California and Vancouver Island, British Columbia. The new bivalve has a commensal relationship with the heart urchin, Brisaster latifrons. It has been observed crawling between the oral spines of this urchin, frequently near the peristome. The bivalve has been recorded from 80 (Vancouver Island) to 444 (southern California) meters depth, in muddy sediments.In common with other galeommatoideans, the new species broods its young; however it differs from the large majority of commensal members in lacking planktotrophic larval development.Waldo arthuri, new species, has multiple morphological, ecological and developmental similarities to other members of the genus Waldo Nicol, 1966, from the southern Atlantic and Antarctic Oceans. This is most pronounced for the Argentine species, Waldo paucitentaculatus Zelaya & Ituarte, 2013, W. arthuri’s sister species in nuclear and mitochondrial gene trees. Despite this close relationship, W. arthuri is phylogentically distinct and possesses several hinge, shell sculpture, foot, and mantle tentacle characteristics that merit its description as new. PB - Pensoft Publishers SP - 67-80 SN - 1313-2989 SN - 1313-2970 IS - ER -