Scorpiodinipora costulata ( Canu & Bassler, 1929 )

Taylor, Paul D. & Tan, Shau-Hwai Aileen, 2015, Cheilostome Bryozoa from Penang and Langkawi, Malaysia, European Journal of Taxonomy 149, pp. 1-34 : 29

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.

Figures

Fig. 15. — A–C. Hippopodina feegeensis (Busk, 1884). Pantai Pasir Hitam, Langkawi, MSL BRY001b. A. Zooids near growing edge (top). B. Group of autozooids and an ovicell. C. Autozooidal orifice with an adventitious avicularium. — D–F. Microporella sp. Kampung Kuala Temoyong, Langkawi, MSL BRY012d. D. Group of zooids. E. Ascopore, orifice and avicularium (top right). F. Oblique view of ovicellate autozooid showing ascopore and avicularium with mandible. — G. Scorpiodinipora costulata (Canu & Bassler, 1929) (left) and Microporella (right). MSL BRY012c and MSL BRY012d, respectively. Kampung Kuala Temoyong, Langkawi. — H–I. Scorpiodinipora costulata (Canu & Bassler, 1929). H. Kampung Kuala Temoyong, Langkawi, MSL BRY012c. Zooids at the growing edge. I. Pulau Betong, Penang, MSL BRY025. Group of zooids. Scale bars: A, G = 1 mm; B = 500 μm; C–D, H–I = 200 μm; E–F = 100 μm.