Duncan, 1876
Polycyathus sp. (2)
Type species: Polycyathus atlanticus Duncan, 1876
Total number of species estimated: 16.
Characteristics: Corallum colonial, cylindrical corallites basally united by a common coenosteum or by stolons. Septotheca costate. Three to four cycles of septa; pali present before all but last cycle; columella papillose.
Ecology: Species live in relatively shallow-water cave environments.
Range: Indo-Pacific.