Ambrysus attenuatus Montandon, 1897

Ambrysus attenuatus Montandon, 1897: Verh. Zool.-Bot. Ges. Wien, 15–16.

Material examined. Laguna Iberá RS: 1 ♀, Lobo Cuá Stream, 28°32’37.14’’S, 57°12’3.89’’W, 2.xii.2012.

General distribution. Brazil, Argentina (Moreira et al. 2011b).

Habitat. Very little information exists regarding the habitat associations of A. attenuatus other than its occurrence in streams (López Ruf 2007; López Ruf & Hernández 2007).

At the INR, this species was collected from a single locality, at the margins with dense floating, emergent, and submerged vegetation of Lobo Cuá Stream.

Remarks. The collection of A. attenuatus from INR represents the first record from Corrientes Province. Reynoso-Velasco & Sites (2021) considered it likely that this species, originally described in Ambrysus, is a member of the genus Australambrysus.