Celleporaria cylindrocystis Tilbrook, 2006

(Figs 62–65; Table 14)

Celleporaria cylindrocystis Tilbrook, 2006: 145, pl. 27D–F.

Figured material. RGM.1350559, early Pleistocene, Java; RGM.1350560, Holocene, UPGG 041, off South Sulawesi.

Description. Colony encrusting, multiserial, becoming multilaminar through frontal budding. Basal autozooids irregularly polygonal, distinct with shallow interzooidal furrows, longer than broad (mean L/W = 1.13); frontally budded autozooids irregularly arranged, erect, deep-bodied. Frontal shield convex, slightly nodular, with 6–8 irregularly spaced, subcircular areolar pores, 15–25 µm in diameter. Orifice subcircular with three tooth-like processes, squared or pointed, delineating asymmetrical pseudosinuses; condyles absent. Two distolateral, oral spine bases may occur, about 15 µm in diameter. Suboral avicularium small, elliptical, facing frontally, directed proximally, often placed at the apex of a raised cylindrical structure; crossbar complete. Interzooidal avicularia irregularly distributed, variable in size, spatulate or elliptical. Ooecium hood-like, broader than long, slightly nodular like the frontal shield, imperforate.

Remarks. A half-dozen fragments of Celleporaria cylindrocystis were found in our samples. This species was described for the first time from the Solomon Islands but specimens previously assigned to Celleporaria tridenticulata (Busk, 1881) may belong to this species (Tilbrook 2006). Celleporaria cylindrocystis is distinguished by the three tooth-like processes in the orifice, the presence of oral spines, and the suboral avicularium placed on a cylindrical cystid. The latter character is unique to this species in the genus Celleporaria (Tilbrook 2006) . The Pleistocene specimens differ from the holotype specimen in having fewer marginal areolar pores.

N, Number of colonies and number of zooids measured; SD, standard deviation; Av, avicularium; Int, interzooidal.