Monalysidium Chapman 1900
Monalysidium acicularis (Batsch 1791) (Fig. 14:11–16)
Description. See Batsch (1791, p. 3, pl. 6, fig. 16a, b).
Distribution within study area. Monalysidium acicularis only occurs in small numbers per site (one to five specimens) in Lagoon 2 of One Tree Island and on Heron Reef flat, specifically from the inner/outer reef boundary (Transect 1) and the ST/HW transect. Greatest abundance was recorded at the rampart from site 10 of the ST/HW transect.