Acropora rudis (Rehberg, 1892)

(Fig. 84)

Madrepora rudis Rehberg, 1892: 41, pl. 4 fig. 9.

Type locality. Ceylon (Sri Lanka) (holotype NMB).

MTQ Holdings. Maldives: G60273; Sri Lanka: G55223–24, G55577–78; Bangladesh: G50567; Thailand: G37293, G37302, G55983–84, G56094–97, G61757; Indonesia: G47165–66 Sumatra.

Species group: rudis.

Description. Colony outline: indeterminate, predominantly arborescent. Branches: tertiary branching order absent; length: 5 0–100 mm; diameter:>19.9 mm, axial-dominated, tapering; radial crowding: some touching; axial/radial

ratio:>1:10. Axial corallites: greater than three synapticular rings; not porous; outer diameter 2.6–4.1 mm; inner diameter 0.6–1.2 mm; primary septa to ¾ R. Radial corallites: very large; greater than three synapticular rings; one size or graded; inner wall developed; shape: rounded tubular; openings: oval-rounded; primary septa to ½ R. Coenosteum: same on and between radials: reticulate; spinule shape: elaborate.

Further literature. Wallace & Wolstenholme (1998), Wallace (1999), Veron (2000).