Shell-bearing Mollusca (Bivalvia and Gastropoda) from submarine caves in Hong Kong Author Lam, Katherine Author Morton, Brian Author Leung, K. F. text Journal of Natural History 2008 2008-03-31 42 9 - 12 927 952 http://dx.doi.org/10.1080/00222930701862674 journal article 10.1080/00222930701862674 1464-5262 5225019 Spondylus barbatus Reeve, 1856 :sp. 16 ( Figure 3 ) Description Shell length, 22 mm , irregularly ovate. Shell height slightly greater than length, shell moderately convex. Attached to hard substrata by the umbonal area of right valve. Shell reddish to purplish brown or pink. Surface ornamented with dense radial ribs. Dorsal ribs become longer and broader than the others and have spatulate ends. Type locality ‘‘Philippine Islands’’. Distribution Indo-Pacific , including Japan and eastern Hong Kong , rocky subtidal 4–20 m .