Hiantopora sp.

(Figs 16–18; Table 6)

Figured material. RGM.1350547, Holocene, UPGG 041, off South Sulawesi.

Description. Colony encrusting, multiserial, unilaminar. Zooidal boundaries ill-defined in the studied fragment because of cemented sediment on the colony surface. Autozooids generally ovoidal, longer than broad (mean L/W = 1.30). Gymnocyst more developed laterally, smooth. Cryptocyst a narrow, raised rim surrounding the opesia. Opesia oval to pear-shaped, longer than broad, occupying almost the entire frontal surface. Few (3–5) mural spine bases placed distolateral to the orifice, stout, 30–45 µm in diameter, sometimes coalescent and platy. A single, adventitious avicularium is located distolaterally of orifice, proximolaterally directed; rostrum rounded triangular. Ooecium small, raised, cap-like; ectooecium incompletely calcified.

Remarks. A single, poorly-preserved fragment of Hiantopora sp. was found in our samples. This specimen appears to conform to the characters of Hiantopora, notably the slightly developed cryptocyst, stout platy distolateral spine bases, cap-like ooecium with partially exposed endooecium, and adventitious avicularia. However, the specimen is too poorly preserved to allow any significant comparison with known species of Hiantopora .

N, Number of colonies and number of zooids measured; SD, standard deviation.