Micromussa Veron 2000

Micromussa is a genus of stony corals in the family Lobophylliidae.

'Colonies are submassive or encrusting and usually flat. Corallites are cerioid or subplocoid, either circular or angular in shape and up to 8 millimetres diameter. Septa are thickened at the corallite wall, and have conspicuous teeth. Colonies may have fleshy tissue over the skeleton, but skeletal structures remain visible. Tentacles are extended only at night.' (Veron, 2000, vol. 3: 8)

Colonial; encrusting or massive. Budding intracalicular and extracalicular. Corallites monomorphic; discrete. Monticules absent. Coenosteum spinose; usually limited (includes double wall). Calice width medium (4–15 mm), with medium relief (3–6 mm). Costosepta mostly not confluent. Septa typically in three cycles (24–36 septa), although M. pacifica may contain more than 36 septa. Free septa irregular. Septa spaced 6–11 septa per 5 mm. Costosepta unequal in relative thickness. Columellae trabecular and spongy (> three threads), < 1/4 of calice width, and discontinuous among adjacent corallites with lamellar linkage. Internal lobes usually absent. Epitheca well developed. Endotheca low-moderate (tabular). Tooth base at midcalice elliptical-parallel. Tooth tip orientation parallel. Tooth height medium (0.3–0.6 mm). Tooth spacing medium (0.3–1.0 mm), with > six teeth per septum. Tooth shape equal between first and third order septa. Tooth size equal between wall and septum. Granules scattered on septal face; strong (pointed). Interarea smooth. Walls formed by dominant paratheca and partial septotheca. Thickening deposits in concentric rings with extensive stereome. Costa centre clusters strong; 0.3–0.6 mm between clusters; medial lines weak. Septum centre clusters weak; > 0.5 mm between clusters; medial lines weak.