An annotated and illustrated checklist of species of the coral genus Acropora (Cnidaria: Scleractinia) from Vamizi Island, Mozambique Author Sola, Erwan Author Silva, Isabel Marques da Author Glassom, David text African Invertebrates 2015 2015-12-31 56 3 807 807 http://www.bioone.org/doi/10.5733/afin.056.0320 journal article 10.5733/afin.056.0320 2305-2562 7914925 Acropora abrotanoides (Lamarck, 1816) Fig. 2 Colony growth form : Strongly irregular with thick prostrate to upright branches and an encrusting base; basal branches are highly fused and upward-projecting ones may be pointed or rounded, bearing many axial corallites. Axial corallites : Outer diameter 1.6–2.3 mm ; inner diameter 0.7–1.1 mm ; not well differentiated from radial corallites at the tip of branches; long and tubular; primary septa extend deep within calyx; secondary septa absent. Radial corallites : Mixture of sizes and shapes gives colony spiny appearance; long and tubular with clearly dimidiate opening; shorter ones are completely dimidiate; interspersed are sub-immersed corallites with round opening; long tubular incipient axial corallites with round opening are frequent; septal development is reduced to lines of spines. Coenosteum : Costate on radial corallites and reticulate with scattered spinules in intercorallite areas. Remarks: This species has similarities with A. robusta (Dana, 1846), but is distinguished mainly by the profusion of incipient axial corallites distally on branches and for having more elongate radial corallites.