Fig 1. Nomenclature of parts and methods of measurements of sclerotized parts.

The diagrams indicate the nomenclature used in this paper and the method of measurements for all sclerotized parts, including male and female organs and haptoral parts for Pseudorhabdosynochus spp., and male copulatory organ for Echinoplectanum echinophallus. Abbreviations: AS, accessory structure; Ca1, primary canal; Ca2, secondary canal; Ch1, primary chamber; Ch2, secondary chamber; Tr, trumpet. Measurements: pcew, primary chamber external width; scew, secondary chamber external width.