Isopora crateriformis (Gardiner, 1898)

(Fig. 119)

Madrepora crateriformis Gardiner, 1898: 258, pl. 23 fig. 1.

Type locality. Ellice Islands (Tuvalu) (holotype NHM).

MTQ Holdings. Indonesia: G51551, G51553 Molucca Sea; G51554–56, G51558–59 Halmahera; G61008–10 Irian Jaya; Australia: G58435, G58802–26, G60094–95 South-East; New Caledonia: G58910; Fiji: G58827–28; Samoa: G36633, G38980, G38983, G63112.

Description. Colony outline: determinate, predominantly encrusting. Branches: tertiary branching order absent; length: <25 mm; diameter:>19.9 mm, axial-dominated, reverse tapering; radial crowding: some touching; axial/radial ratio:>1:10. Axial corallites: greater

than three synapticular rings; not porous; outer diameter 1.5–2.2 mm; inner diameter 0.5–0.8 mm; primary septa to 1/3 R. Radial corallites: large; greater than three synapticular rings; one size or graded; inner wall developed; shape: conical; openings: oval-rounded; primary septa to 1/3 R. Coenosteum: same on and between radials: dense spinules; spinule shape: meandroid elaborate.

Further literature: Wallace & Wolstenholme (1998), Wallace (1999), Veron (2000), Dai & Horng (2009), Turak & DeVantier (2011).