Fenestrulina caseola ( Hayward, 1988 )

Dick, Matthew H., Tilbrook, Kevin J. & Mawatari, Shunsuke F., 2006, Diversity and taxonomy of rocky-intertidal Bryozoa on the Island of Hawaii, USA, Journal of Natural History 40 (38 - 40), pp. 2197-2257 : 2235-2237

Fenestrulina caseola ( Hayward, 1988)

( Figure 12D )

Fenestrulina caseola Hayward 1988, p 325 , Plate 10d.

Fenestrulina caseola: Ryland and Hayward 1992, p 280 , Figure 26d; Tilbrook 2006, p 217, Figures 46F, 47F.

Measurements

ZL, 0.48–0.60 (0.543¡0.040). ZW, 0.35–0.45 (0.406¡0.034). OrL, 0.08–0.09 (0.083¡0.005). OrW, 0.13–0.15 (0.138¡0.004). OvL, 0.024. OvW, 0.031 (ovicell n 51).

Description

Colony unilaminar, encrusting, white; frontal wall smooth, only moderately inflated, completely covered with large pores, each occluded by a finely cribriform plate with triradial suture lines. Orifice D-shaped, broader than long, proximal margin straight, oral spines lacking. Ascopore ringed by a narrow rim; opening irregular, elliptical, or lunate in outline, the margin irregularly denticulate; separated from orifice by about length of orifice. Ovicell smooth, sunken in frontal wall of distal zooid, flattened, with chevron-shaped transverse ridge with small umbo at apex, and with semicircle of pores just inside the periphery.

Distribution

Mascarene Islands, Indian Ocean; Great Barrier Reef (for references, see synonymies). This is the first record for the Hawaiian Islands.

Figures

Figure 12. (A–C) Bryopesanser serratus n. sp.: (A) paratype 1 (NHM 2006.7.21.18), autozooids; note predation hole in right-hand zooid; (B) holotype (NHM 2006.7.21.17), enlargement of distal end of an ovicellate zooid; (C) paratype 2 (YPM-38556), ancestrula (lower left-of-centre, broken) and periancestrular zooids, showing a spiral budding pattern. (D) Fenestrulina caseola Hayward: autozooid and ovicellate zooid. All specimens bleached. Scale bars: 400 Mm (A); 200 Mm (B); 500 Mm (C, D).