Phenganax subtilis

Description. The colony consists of ~ 50 polyps, which are connected through thin rounded stolons with a width of approximately 0.13 - 0.2 mm, growing over coral rubble. Polyps are partly clustered and spaced apart irregularly (1.0 - 3.0 mm). Polyps retract into calyces (0.65 - 0.77 mm width) that are barrel shaped. Expanded polyps are 3.0 - 3.5 mm in width and have tentacles with pinnules that are widely spaced and arranged in pairs of 12 on either side of the rachis. No sclerites were found in any of the specimens. Polyps are brown coloured in life and whitish yellow when preserved in ethanol. Zooxanthellate.

Distribution. Sepangar Island, Kota Kinabalu, Sabah, Malaysia. Manukan Island, TARP, Kota Kinabalu, Sabah, Malaysia.

Etymology. From Latin subtilis, meaning simple, subtle, plain; denoting the subtleness of the polyps blending into the reef background. Gender: masculine.

Material examined. All specimens are from Kota Kinabalu, Sabah, Malaysia and collected by YW Lau. Holotype: NSMT-Co 1684, Sepangar, west of Sepangar Island (06 ° 03 ' 38.66 " N, 116 ° 04 ' 0.65 " E), 7 m depth. Paratypes: IPMB-C 01.00011: Sepangar II, west of Sepangar Island (06 ° 04 ' 7.38 " N, 116 ° 04 ' 6.76 " E), 7 m depth. IPMB-C 01.00012: Manukan, north of Manukan Island, TARP (05 ° 58 ' 46.1 " N, 116 ° 00 ' 10.6 " E), 12 m depth. IPMB-C 01.00013: Manukan, north of Manukan Island, TARP (05 ° 58 ' 46.1 " N, 116 ° 00 ' 10.6 " E), 12 m depth.