Genus Chironephthya: Similar to sea fans, but lack central axis... and to Siphonogorgia, but polyps are able to retract to their own calyx. 

Genus Siphonogorgia: Superficially resemble Gorgonians. Polyps clustered toward ends of branches, absent from lower trunk, branches. No internal "axis" like sea fans. Can be completely withdrawn. Western Pacific; Philippines, Belau, Solomon Islands. Common on reef slopes, overhangs at times.