Pionosyllis maxima Monro, 1930: 92, Fig. 29.—Hartman (1964): 87, pl. 27, Figs. 3–5.— Hartman-Schröder & Rosenfeldt (1988): 39.
Pionosyllis anops Hartman, 1953: 24, Fig. 6 a–c; (1964): 85, pl. 26, Figs. 5 –6. Pionosyllis epipharynx Hartman, 1953: 23, Figs. 3–4; 1964: 87, pl. 27, Figs. 3–5; 1967: 58. Eusyllis maxima Jiménez, San Martín & López (1995): 497, 499, 500, Figs. 1 a–f.
Material examined. Eusyllis maxima: (MNCNM 16.01/ 1535, 3650 and 3675). Distribution. Southern areas of Indian, Atlantic and Pacific Oceans. South Georgia: East of Jason Light, May Bay, Cumberland Bay and near localities; Antarctica; South Argentine.
Habitat. Grey mud and/or rocks; intertidal algae.