Abstract
This taxon is distinguished from other Ergasilidae by having only three pairs of legs, and a well‐developed hook on the penultimate joint of the second antenna abutting against the claw‐like terminal segment. A. amplexus has been reported from Anguilla australis, A. dieffenbachii, Perca fluviatilis, Carassius auratus, Retropinna retropinna, Physiculus bachus, Galaxias maculatus, Arripis trutta, Rhombosolea leporina, R. retiaria, and R. plebeia from Lake Ellesmere, near Christchurch, and from Anguilla australis from Makara River near Wellington. Both localities are euryhaline.

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