Gigantactis longicauda Bertelsen & Pietsch 2002

Metamorphosed females differ from all other Gigantactis congeners in having length of illicium 330% SL; escal bulb nearly spherical, with a short, truncated distal prolongation, pigmented distally, and bearing two pairs of short, spatulate appendages; stem of illicium without filaments (Ref. 41361); short dentary teeth (longest tooth 1.7% SL), arranged posteriorly in two longitudinal series; longest caudal fin rays 50% SL (Ref. 86949).

Dorsal spines (total): 0; Dorsal soft rays (total): 5; Analspines: 0; Analsoft rays: 5

Known only from the holotype collected in an open midwater trawl (Ref. 41361). Maximum length based on an immature female (Ref. 41361).