Scorpiodinipora costulata (Canu & Bassler, 1929)

Fig. 15 G–I

Schizoporella costulata Canu & Bassler, 1929: 317, pl. 36, fig. 10.

Scorpiodinipora costulata – Harmelin et al. 2012: 129, figs 1–4.

Material

MALAYSIA: MSL BRY012c, Kampung Kuala Temoyong, Langkawi, colony encrusting interior of large gastropod shell. MSL BRY025, Pulau Betong, Penang, on gastropod from oyster rafts.

Description

Colony encrusting, multiserial, unilamellar; buttressed pore chambers visible at stepped growing edge. Ancestrula and early astogeny not observed. Autozooids rounded subhexagonal, 0.35–0.41 mm long by 0.23–0.26 mm wide, zooidal boundaries with narrow grooves; frontal shield convex, mammillated, bordered by large areolar pores separated by radial ridges, imperforate centrally; orifice large relative to zooid size, ovoidal, longer than wide, 0.13–0.15 mm long by 0.09–0.10 mm wide, anter and poster similarly sized, well rounded, separated by condyles that mark beginning of a rim outlining anter; oral spines lacking; ovicells absent. No avicularia.

Remarks

This widely distributed species was revised by Harmelin et al. (2012) who noted its preference for gastropod shells. The two colonies collected in Malaysia, one from Langkawi and the other from Penang, are both on gastropod shells, though not a living gastropod in the case of the Langkawi specimen, which encrusts an interior surface.