Photos courtesy of Samantha M. Clements & the Khaled bin Sultan Living Oceans Foundation.

This is the true A. chagosensis, endemic to Chagos and an obligate symbiont of Heteractis magnifica.

Compared to the undescribed A. cf bicinctus in Chagos, it is smaller, more brown than orange, with dark ventral fins, and thin stripes. Juveniles lack subapical dark spots in the dorsal and anal fins (present in juveniles of A. cf bicintus).