Pycnogonum cessaci Bouvier, 1911

Syn.: Pycnogonum pamphorum — Marcus, 1940c: 115–117, fig 16a–d (Brazil: São Paulo, shallow water).— Sawaya, 1941: 278–282 (Brazil: São Paulo).— Varoli, 1996: 42 [tab.] (Brazil: São Paulo). Pycnogonum leticiae — Mello-Leitão, 1945: 1–4, figs 1 –5 (Brazil: Rio de Janeiro, intertidal).

Pycnogonum (Retroviger) cessaci — Stock, 1992: 136 (Brazil: São Paulo, infralittoral). Holotype: Unknown.

Type locality: Cape Verde.

Ecological note: On seaweeds, like Sargassum cymosum C. Agardh and S. rigidulum Kuetzing and hydrozoans.

Pycnogonum elephas Stock, 1966: 397 –400, fig 5 (Brazil: Rio de Janeiro, 30–740 m). Holotype: Unknown.

Type locality: between Rio de la Plata and Rio de Janeiro.

Pycnogonum gibberum du Bois-Reymond Marcus & Marcus, 1962: 3 –5, figs 1 –5 (Brazil: São Paulo, 32 m) . Syn.: Pycnogonum (Retroviger) gibberum — Stock, 1992: 136 (Brazil: São Paulo, Rio de Janeiro, Espírito Santo, 28–56 m) .

Holotype: Unknown (designated as “1089 ARACHNOIDEA” but without any other information). Type locality: Lage de Santos, São Paulo, Brazil.