Acropora prominens
Nemenzo, 1967
Corallum consisting of heavy vertical stems (not plates) arising from creeping base. Biggest stem 12 cm high, 4.4 x 3.7 cm across at narrowest level, bifurcated into slightly attenuate branchlets – 4.5 cm long, 2.9 x 3.2 cm across at base and 2.3 x 2.5 cm across just below tip. Apex well rounded. Stems and branchlets made somewhat angular by low longitudinal ridges, swollen here and there. Creeping base heavily epithecate, closely hugging substratum.
Corallites crowded, protruding, various sizes intermixed; calices round, terminal slightly oblique. Apical corallites (several on each apex) slightly exsert, 3-3.5 mm diameter; wall thick, porous rim well rounded. Radial corallites tubular, longest and widest just below tips of branches, becoming lower and smaller towards base; large ones towards tips usually with inflated bases, distinctly ascending but not appressed; up to 4 mm long, 1.5 mm across at rim, 2.5 mm across at base. Large ones towards base almost right angle to surface, uniformly cylindrical, 2 mm diameter, 3 mm high, small ones of various diameters, some as low as 0.5 mm interspersed among large ones. Wall thin compared on one side but this is not the upper side always, except among corallites near apices.
Septa poorly organized; oftentimes less than 6 primaries present with 1 or 2 distinctly wider than others; very narrow, uneven in extent. Some corallites have few, very narrow secondaries but cycle always complete.
Outer surface of corallites covered with fine, blunt, crowded spine of even height imparting trim, velvety appearance to wall. Intercalicinal areas show fine reticulum with very low, distant spines, sharply in contrast with those on calicinal wall.
Remarks: This species is close to A. plicata but the stems are not flat, rosettes are not on ridges only, corallites are wider; septa not well organized; the “longitudinal series of dentate plates” on surface note present, reticulum is present instead.
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