Septal arrangement (subscripted with “1”), microarchitecture (subscripted with “2”, and “3” of septal projection) and septal junctions/wall structure (subscripted with “4”) in the examined Siderastreidae (sensu Veron 2000): Coscinaraea columna (A), Coscinaraea wellsi (B), Horastrea indica (C), Pseudosiderastrea tayamai (D), Siderastrea savignyana (E), Anomastraea irregularis (F). Transverse groups of centers of calcification typical of the Robusta highlighted with white arrows whereas radial extension of septum with black line (marked in figure items subscripted with “2” and “4”). Main features of septal junctions (wall structure) marked with arrows: synapticulae (A4, D4, E4, F4), septotheca (C4), and fulturae (B4). Contribution to Zoology, 76 (1) – 2007