Celleporaria cylindrocystis Tilbrook, 2006

Martino, Emanuela Di & Taylor, Paul D., 2018, Early Pleistocene and Holocene bryozoans from Indonesia, Zootaxa 4419 (1), pp. 1-70 : 24-25

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.

Figures

FIGURES 62–65. Celleporaria cylindrocystis Tilbrook, 2006. 62–64. RGM.1350559, early Pleistocene, Java. 62. General view of the colony fragment. 63. Group of autozooids, some with oral spine bases. 64. Close-up of an orifice showing the three tooth-like processes. 65. RGM.1350560, Holocene, UPGG041, off South Sulawesi. Group of zooids, some of which are ovicellate (see arrows), and interzooidal avicularia. Scale bars: Fig. 62 = 300 µm; Figs 63, 65 = 200 µm; Fig. 64 = 50 µm.