Appendix 1. Remarks concerning doubtful or erroneous depth records in Solís-Marín et al. (2009).
Cucumaria crax Deichmann, 1941, is reported by Solis-Marin et al. (2009) in depths of 8-549 m. According to Maluf (1988), this species occurs between 15 and 55 m depth. We could not locate a reference to the 549 m record. When the list of material cited by Solis-Marin et al. (2009; 3 records) is examined, the only option for this record seems to be the one of "Bahía Sta. María", 24°56.3'N, 108°44.6'W (the 2 others are cited by Maluf, 1988). However, there is no citation of a cruise sampling at that depth in this area and, according to ecological data gathered in that area, bottom at ca 549 m depth is almost anoxic (Hendrickx and Serrano, 2010). In addition, plotting the latitude-longitude data on a map indicates that the "Sta. María" station actually corresponds to a depth of less than 200 m.
Pseudocnus californicus (Semper, 1868), in 0-717 m (Solis-Marin et al. 2009). An intertidal to 190m species according to Maluf (1988). We were not able to locate a record at this depth. All records by Solis-Marin et al. (2009) are from intertidal or very shallow water; only 1 is from the same sample as previous species (i.e., C. crax; Bahía Sta. María), but the authors provide a distinct maximum depth range (717 m vs. 549 m for C. crax).
Holothuria leucospilota (Brands, 1835), in 0-695 m (Solis-Marin et al. 2009). An intertidal species according to Maluf (1988). According to Samyn and Massin (2003), deeper record is from 8 m. We found no trace of a 695 m record in the Gulf of California or in the eastern Pacific for this species.
Parastichopus californicus (Stimpson, 1857), in 5-5 640 m (Solis-Marin et al. 2009). From the intertidal to 180 m (Maluf, 1988) and to 216 m (Lambert, 1986). There seem to be no such depth in the Gulf of California. The 2 lots cited by Solis-Marin et al. (2009) are from San Benedito and Angel de la Guarda Islands, certainly from much shallow water. Also, the reference to Théel (1886) in the synonymy refers to Théel´s "Challenger" contribution but it should be the "Blake" contribution. See "Referencias Bibliográficas" in Solis-Marin et al. (2009).
Chiridota aponocrita H.L. Clark, 1920, in 9-4 755 m (Solis-Marin et al. 2009). In the intertidal (Maluf 1988). Actually the data reported by Solis-Marin et al. (2009) correspond to 1 of the 2 Albatross stations where another species, Protankyra "abyssicola" (see H.L. Clark, 1920), was collected (top of page 125 in H.L. Clark, 1920). The depth range reported for Ch. aponocrita is therefore due to a confusion.