taxonID	type	description	language	source
F252B26F282241A2853D5797D58E3196.taxon	description	Description. Shell small (length less than 5 mm), ovate to trapezoidal, extremely thin, fragile, translucent to opaque, gaping ventrally and on anterior and posterior ends; sculpture of commarginal striae, weak radial ribs in some; periostracum thin to thick, translucent to white; hinge plate narrow, adults edentate; ligament internal; mantle papillate, reflected, covering most of outer shell surface; long, slender mantle tentacles extend well past shell margin; foot elongate, thin, triangular to cylindrical, heel strong to absent; with one demibranch on each side.	en	Valentich-Scott, Paul, O Foighil, Diarmaid, Li, Jingchun (2013): Where's Waldo? A new commensal species, Waldo arthuri (Mollusca, Bivalvia, Galeommatidae), from the Northeastern Pacific Ocean. ZooKeys 316: 67-80, DOI: http://dx.doi.org/10.3897/zookeys.316.4256, URL: http://dx.doi.org/10.3897/zookeys.316.4256
F252B26F282241A2853D5797D58E3196.taxon	discussion	Discussion. Zelaya and Ituarte (2002) revived the use and understanding of this genus, with the redescription of the type species, Waldo parasiticus, and the description of a new species: Waldo trapezialis. They described, for the first time, the gross anatomy of members of the genus and suggested a possible position within the Galeommatoidea. All species are likely to be obligate commensals with echinoid echinoderms. Two additional species were described from the southwestern Atlantic Ocean (Zelaya and Ituarte 2013).	en	Valentich-Scott, Paul, O Foighil, Diarmaid, Li, Jingchun (2013): Where's Waldo? A new commensal species, Waldo arthuri (Mollusca, Bivalvia, Galeommatidae), from the Northeastern Pacific Ocean. ZooKeys 316: 67-80, DOI: http://dx.doi.org/10.3897/zookeys.316.4256, URL: http://dx.doi.org/10.3897/zookeys.316.4256
785ECE2C9DA390C342740933DE77E186.taxon	description	Description. Shell extremely thin, fragile, moderately inflated, translucent; equilateral to slightly longer posteriorly, anterior end slightly flared to gently sloping (Figure 1 A-C); shell margins only weakly gaping if at all. Prodissoconch non-umbonate, D-shaped, with a greatly reduced PII comprised of a small number of faint commarginal striae bordering the metamorphic prodissoconch / dissoconch boundary (Figure 1 D), prodissoconch length ranged from 338 to 357 µm (n = 8) (Figure 1 B). Dissoconch sculpture of commarginal striae, plus low broad irregular radial ribs; external sculpture variable, radial ribs absent to moderately strong, especially on anterior and posterior ends in some specimens. Beaks low, wide. Hinge plate extremely narrow, edentulous (Figures 1 E, F). Length to 5 mm. Mantle large, reflected, covering approximately 80 % of outer shell surface when fully extended, not covering umbones (Figure 1 G); mantle can be completely retracted into the shell; reflected portion papillate (Figure 1 H); fused posteroventrally; facultative exhalant siphon, trumpet-shaped, non-papillate; anterior end thin, non-papillate. Mantle tentacles long, extend well past shell margins (Figure 1 G). Adult with projecting anterior pair, two laterally projecting pairs just posterior to anterior tentacles (one pair on each side); lateral tentacles not present on individuals less than 1 mm in length; ventral pair of tentacles just anterior of exhalant siphon (largest of all tentacles, in adults up to length of shell); single posterior tentacle projects dorsally to the exhalant opening. When animals are actively crawling, it appears that the tentacles might be used as levers to navigate between the urchin spines. Foot large, exceeds the length of the shell when fully extended, vermiform, without heel (Figure 1 G); long ventral byssal groove extending to end of smooth foot tip. This species is an active crawler, and can also attach to the host by byssal threads. Ctenidia with one demibranch on each side, comprised of about 12 - 15 widely spaced filaments in larger specimens.	en	Valentich-Scott, Paul, O Foighil, Diarmaid, Li, Jingchun (2013): Where's Waldo? A new commensal species, Waldo arthuri (Mollusca, Bivalvia, Galeommatidae), from the Northeastern Pacific Ocean. ZooKeys 316: 67-80, DOI: http://dx.doi.org/10.3897/zookeys.316.4256, URL: http://dx.doi.org/10.3897/zookeys.316.4256
785ECE2C9DA390C342740933DE77E186.taxon	distribution	Distribution and habitat. Canada, British Columbia, Barkley Sound, Sanford Island, 80 meters, and Imperial Eagle Channel in soft sediments; and United States, California, from Monterey Bay to La Jolla, from 113 to 444 meters [SBMNH]. Ten juvenile specimens from the intertidal zone of Smeaton Bay, Alaska (55.4 ° N, 130.6 ° W) [SBMNH 149330] are too small to be identified to species, but might also be Waldo arthuri.	en	Valentich-Scott, Paul, O Foighil, Diarmaid, Li, Jingchun (2013): Where's Waldo? A new commensal species, Waldo arthuri (Mollusca, Bivalvia, Galeommatidae), from the Northeastern Pacific Ocean. ZooKeys 316: 67-80, DOI: http://dx.doi.org/10.3897/zookeys.316.4256, URL: http://dx.doi.org/10.3897/zookeys.316.4256
785ECE2C9DA390C342740933DE77E186.taxon	etymology	Etymology. This species is named after Dr. Arthur Fontaine, Professor Emeritus of Biology at the University of Victoria, British Columbia, Canada.	en	Valentich-Scott, Paul, O Foighil, Diarmaid, Li, Jingchun (2013): Where's Waldo? A new commensal species, Waldo arthuri (Mollusca, Bivalvia, Galeommatidae), from the Northeastern Pacific Ocean. ZooKeys 316: 67-80, DOI: http://dx.doi.org/10.3897/zookeys.316.4256, URL: http://dx.doi.org/10.3897/zookeys.316.4256
