Four new species of Dendrophyllia are described and figured. D. suprarbuscula n.sp. was found at 90 m, off Izu Hachijou Island, and D. paragracilis n. sp. in the shallow marine cave of Ogasawara Islands and Ryukyu Islands. Other two new species, D. futojiku n. sp. having big columellae and D. minima n. sp. having the smallest corallites, were found in shallow waters of Izu Hachijou Island. We revised the key to 20 species of Dendrophyllia and related genera in Japan including new species.
A new subspecies, Culicia japonica tenuisepes, found in shallow waters of Tsukumo Bay, Sea of Japan and two new species, Culicia subaustraliensis from shallow waters and Phyllangia echinosepes from 90 m depth off Izu Hachijo Island, the Pacific coast of Honshu are described and illustrated. These species differ from hitherto known species or subspecies not only morphologically, but also by morphometrical features such as the correlation between calice diameter and septal number or the ordering of septal width.
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