Dactylogyrids (Monogenoidea) Parasitizing the Gills of Spinefoots (Teleostei: Siganidae): Revision of Pseudohaliotrema, with Redescriptions of P. sphincteroporus and P. molnari from the Great Barrier Reef, Australia

Nine species of spinefoots, Siganus spp., were examined for Pseudohaliotrema spp. (Monogenoidea, Dactylogyridae) from Australia, China, and Egypt. The findings of Pseudohaliotrema sphincteroporus on the gills of Siganus doliatus, Siganus lineatus, and Siganus corallinus and Pseudohaliotrema molnari on the gills of Siganus corallinus, S. doliatus, S. lineatus, and Siganus punctatus from the Great Barrier Reef, Australia, represent new host and locality records for these helminths. Siganus fuscescens from Australia and China; Siganus argenteus, Siganus rivulatus, and Siganus luridus from Egypt; and Siganus vulpinus from Australia were negative for Pseudohaliotrema spp. Pseudohaliotrema is revised and P. sphincteroporus and P. molnari are redescribed; drawings of the sclerotized parts of the haptor and male reproductive system and measurements of Pseudohaliotrema falcata are provided based on available paratypes. Pseudohaliotrema is limited to 3 species: P. sphincteroporus, P. molnari, and P. falcata. Pseudohaliotrema sigani and Pseudohaliotrema virgata are considered junior subjective synonyms of P. sphincteroporus.