Reptadeonella cellulanus Tilbrook, Hayward & Gordon, 2001

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 : 262

Reptadeonella cellulanus Tilbrook, Hayward & Gordon, 2001

( Fig. 4D )

Our material is generally in accord with this species, which seems to be somewhat variable in the size and orientation of the suboral avicularium and height of the peristome. Autozooids measure 561‒818 μm long (mean 629 μm) and 264‒477 μm wide (mean 362 μm), close to that of colonies from Efate, Vanuatu (type locality), with a mean zooid length of 650 μm and width of 340 μm ( Tilbrook et al., 2001), whereas zooids from the Solomon Islands were cited as being 500‒600 μm long and 300‒400 μm wide ( Tilbrook, 2006). Tilbrook (2006) noted that the ancestrula of this species is not single as originally reported but comprises a triad of zooids. Harmer (1957) illustrated putative Reptadeonella joloensis ( Bassler, 1936) from Singapore, but, as L. Vieira (pers. comm., 2022) pointed out, Harmer’s illustration may represent what is now R. cellulanus , which means that R. joloensis may not be a part of the Singapore bryofauna (as listed by Tilbrook & Gordon, 2016). Scanning electron microscopy of the material in the Cambridge Museum examined by Harmer (from the southern Philippines) would clarify the issue.

Figures

Fig. 4. A‒C, Reptadeonella riatanae, new species; A, unbleached autozooids, and avicularia with mandibles in place; B, bleached autozooids with long slit-like spiramina; C, light micrograph showing an ancestrular tetrad (radiating yellow arrows) and a vicarious avicularium (white arrow); D, Reptadeonella cellulanus Tilbrook, Hayward & Gordon, 2001. Scale bars = 0.5 mm (B, D); 0.3 mm (A, C).