Colonies of S. regularis are erect and branching, forming short pink tufts on various substrata. Zooids are narrow in the proximal portion, wider distally. The opesia are ovoid in shape, and occupy approximately 2/3 of the frontal area. Individual zooids measure an average of 0.51 X 0.20 mm. There are 2 - 7 distolateral spines, simple or branching, present around the mural rim. The innermost proximal spine in specialized to act as a shield or scutum over the membranous frontal area. This single spine covers most of the opesia, is large and paddle-shaped with pointed edges. Polypides have obliquely truncate lophophores which average 0.464 mm in diameter. Lophophore bears 13 tentacles that are somewhat translucent, and pink in color. There are avicularia on the inner sides of gymnocysts, and on the outer sides of individual zooids at the same level as the opesia. This species also possesses short, delicate vibraculae located on the posterior-proximal surface of each zooid.