Polyp: Colonies stolonal, arising from a creeping hydrorhiza. Pedicels strongly annulated basally and distally; usually wavy or smooth; Hydrothecae with about 13 to 15 round, broadly triangular teeth; distal wall weakly scalloped in cross section. Hydrothecal diaphragm thick, straight; basal chamber shallow, subspherical. Reproduction: Gonophores release free medusae. Gonothecae laterally flattened, arising from hydrorhiza on short annulated pedicels with a short tubular neck; aperture terminal. Medusae up to 6 mm wide, 3 mm high, flatter than a hemisphere; manubrium tubular; mouth quadrate, with 4 simple lips; 4 radial canals; 16 marginal tentacles; 16 intervening statocysts; gonads elongated on the distal third or fourth of the radial canals; female gonads bearing 20-35 large ova. Ecology and Distribution: Atlantic species. Known in Bocas del Toro from Punta Caracol.