Monogeneans from Pangasiidae (Siluriformes) in Southeast Asia: I. Five new species of

The examination of gill parasites from Pangasius pangasius (Hamilton, 1822) ; P. kinabatanganensis Roberts & Vidthayanon, 1991 ; P. rheophilus Pouyaud & Teugels, 2000 and P. nieuwenbuisii (Popta, 1904) (Siluriformes, Pangasiidae) in Southeast Asia revealed the presence of six species of Thaparocleidus Jain, 1952 (Monogenea, Ancylodiscoidinae). One has been previously described from P. pangasius: T. pangasi (Tripathi, 1957). The other five are new species: T. chandpuri n. sp. from P. pangasius; T. bahari n. sp. and T. sabanensis n. sp. from P. kinabatanganensis; T. redebensis n. sp. from P. rheophilus and T. mahakamensis n. sp. from P. nieuwenhuisii