Distribution: Islas Pastores, Cristobal, Popa, Cayo Agua, Bastimentos, Solarte, Carenero, Colon, Península de Valiente y Laguna de Chiriquí Characteristics: Thin, flattened, often semicircular plates or irregular mounds encrusting substrate. Low ridges, square in cross section, border the plates and run toward colonies' centers forming narrow valleys, occasionally a few independent ridges. Only member of genus where ridges form discontinuous closed