Oncousoecia, Canu, 1918

Dick, Matthew H., Ngai, Nguyen Danh & Doan, Hung Dinh, 2020, Taxonomy and diversity of coelobite bryozoans from drift coral cobbles on Co To Island, northern Vietnam, Zootaxa 4747 (2), pp. 201-252 : 242

Oncousoecia sp.

( Fig. 19B )

Material examined. VNMN-0271 (CT-42), on SEM stub with Tubulipora sp.

Measurements. AzOr inside diameter, 0.11–0.16 (0.132 ±0.017) (n = 6). Ancestrular disk diameter, 0.264; ancestrular tube outside diameter, 0.159 (n = 1).

Description. Young, ancestrular colony with 11 zooids; recumbent, zooids alternating in biserial lobes, though lobes perhaps wider later; peristomes not connate; exterior perforated by minute pseudopores. Zooidal orifices circular or transversely elliptical. Ancestrular primary disk circular, without pseudopores; ancestrula budding zooid distally and giving rise to another zooid laterally, apparently by peristomial budding.

Remarks. Without a more fully developed colony and reproductive structures, this specimen can only tentatively be identified to genus Oncousoecia , and not at all to species.

Figures

FIGURE 19. A. Tubulipora sp., young colony, VNMN-0271. B. Oncousoecia sp., young colony showing ancestrula (right), VNMN-0271. C, D. “Stomatopora” sp., VNMN-0272. C, colony, autozooids. D. Same colony, enlargement. Scale bars: A, B, D, 500 µm; C, 1 mm.