A review of the genus Antorchis Linton, 1911 (Trematoda: Faustulidae) from Indo-Pacific fishes with the description of a new species

Abstract

Species of the faustulid genus Antorchis Linton, 1911 of the tropical Indo-West Pacific are reviewed. We recognise five species in the region, including a novel form. Antorchis nasonis n. sp. is described from Naso annulatus (Quoy & Gaimard) and N. tonganus (Valenciennes) on the southern Great Barrier Reef (GBR). We interpret specimens reported from Naso hexacanthus (Bleeker) from Japan as the same species. This species appears to be the only faustulid known from acanthurid fishes and differs from all other species in the genus in having the prominent dorsal genital invagination close to the posterior end of the body. In addition, new host and locality records are reported for two described species of Antorchis, A. pomacanthi (Hafeezullah & Siddiqi, 1970) and A. tsushimaensis (Machida, 1971). The wide distribution of A. pomacanthi was further demonstrated by the generation of identical ITS2 rDNA sequences for specimens from Ningaloo Reef off Western Australia, off Lizard and Heron Islands (GBR) and off New Caledonia, localities separated by up to 5,300 km. The host-specificity of the genus is considered.

New trematode species Lecithostaphylus halongi n. sp. (Zoogonidae, Microphalloidea) and Gymnotergestia strongyluri n. sp. (Fellodistomidae, Gymnophalloidea) from beloniform fishes in Vietnam

“…At present, the structure of the families Zoogonidae and Fellodistomatidae and the species differentiation within Lecithostaphylus and Gymnotergestia are mainly based on morphological data. Though there are several molecular studies of trematodes from each of these two families (Bray et al, 1999;Hall et al, 1999;Olson et al, 2003;Cribb et al, 2014Cribb et al, , 2015Cutmore et al, 2014;Antar & Gargouri, 2015;Sokolov et al, 2016;Wee et al, 2017;Cutmore et al, 2018;Pérez-Ponce de León et al, 2018;Cabañas-Granillo et al, 2020;Krupenko et al, 2020;Sokolov et al, 2021a, b), most of them do not provide morphological validation of the species under study. In many cases, this means that no sound taxonomical conclusions can be made.…”