Scorpiodinipora costulata ( Canu & Bassler, 1929 )

Jain, Sudhanshi S., Gordon, Dennis P., Huang, Danwei, Kuklinski, Piotr & Liow, Lee Hsiang, 2022, Targeted collections reveal new species and records of Bryozoa and the discovery of Pterobranchia in Singapore, Raffles Bulletin of Zoology 70, pp. 257-274 : 263

Scorpiodinipora costulata ( Canu & Bassler, 1929)

( Fig. 7B )

This species may represent a complex of cryptic species or an example of a human-mediated tropicopolitan coloniser. The Singapore material accords in all respects with the description given by Harmelin et al. (2012), who analysed known records of this species (under various names) from different oceans and selected a type from Romblon, Philippines. Autozooids in the unilamellar encrusting colonies of this species are relatively simple in that they lack oral spines, avicularia, and ovicells. The imperforate frontal shield has radial ridges, and the orifice is elongate-oval with a slight submedial constriction where the condyles are placed. Autozooids in our material measure 302‒429 μm long (mean 363 μm) and 171‒292 μm wide (mean 227 μm). Harmelin et al. (2012) provided measurements for material from Lebanon, the Red Sea, Oman, Ghana, and Brazil (but not Romblon). Zooid length in the Singapore material is closest to that from Brazil (360 μm) and zooid width to that from Ghana (221 μm).

Figures

Fig. 7. A, Thornelya fuscina Tilbrook, Hayward & Gordon, 2001; white arrows indicate three unbroken latero-oral avicularia; B, Scorpiodinipora costulata (Canu & Bassler, 1929); C‒G, Rhabdopleura sp.; C, D, lateral view of erect tubes with annular fusellar rings; E, part of creeping basal tube in vicinity of three broken bases of erect tubes; here the fusellar sutures are parallel to oblique; F, G, parts of creeping basal tube in which the fusellar sutures (arrowheads) are arranged obliquely. Scale bars = 0.5 mm (A, B); 0.1 mm (C, D); 0.2 mm (E‒G).