Setosellina constricta ( Harmer, 1926 )

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

Setosellina constricta ( Harmer, 1926)

( Fig. 2E )

This species was discovered on coral rubble as spot-like colonies 2‒3 mm in diameter. Autozooids are 210‒379 μm long (mean 299 μm) with oval opesiae, and each is typically associated with a small interzooidal avicularium at their distal end, the mandible of which is setiform. There are no ooecia. This species has been discovered in the Middle Miocene of Java, where tiny colonies 1‒2 mm in diameter once lived interstitially on sand grains ( Di Martino et al., 2019).

Figures

Fig. 2. A, B, Exidmonea sp., respectively showing dichotomous branching and a gonozooid; the ooeciopore is indicated by an arrow; C, Arbopercula angulata Levinsen, 1909; D, Parellisina albida (Hincks, 1880a), arrows indicate two of the open avicularian mandibles; E, Setosellina constricta Harmer, 1926; F, Canda pecten Thornely, 1907, note the curved avicularium at the bottom of the left-hand branch. Scale bars = 1 mm (A); 0.5 mm (B‒F).