Monogeneans from Pangasiidae (Siluriformes) in Southeast Asia: IV. Five new species of Thaparocleidus Jain, 1952 (Ancylodiscoididae) from Pangasius krempfi, P. kunyit, P. mekongensis and P. sabahensis

Abstract

The examination of gill parasites from Pangasius krempfi Roberts & Vidthayanon, 1991 ; P. kunyit Pouyaud et al., 1999 ; P. mekongensis Gustiano et al., in press and P. sabahensis Gustiano et al., in press (Siluriformes, Pangasiidae) in Southeast Asia revealed the presence of six species of Monogenea, all belonging to the genus Thaparocleidus Jain, 1952 (Monogenea, Ancylodiscoididae) as defined by Lim (1996) and Lim et al. (2001). One has been previously described (T. vietnamensis Pariselle et al., 2002), five are considered as new species : T. humerus n. sp. and T. culter n. sp. on P. kunyit ; T. mehurus n. sp. and J. culteroides n. sp. on P. sabahensis ; and T. phuongi n. sp. on the four studied host species. The latter one, due to slight morphometric differences linked to geographical origin of hosts, is described as made up of three sub-species : T. phuongi phuongi n. sub-sp., T. phuongi malaysiensis n. sub-sp. and T. phuongi indonesiensis n. sub-sp.

Keywords

• Monogenea
• Ancylodiscoididae
• Thaparocleidus culter n. sp.
• Thaparocleidus culteroides n. sp.
• Thaparocleidus humerus n. sp.
• Thaparocleidus mehurus n. sp.
• Thaparocleidus phuongi n. sp.
• Thaparocleidus phuongi phuongi n. sub-sp.
• Thaparocleidus phuongi malaysiensis n. sub-sp.
• Thaparocleidus phuongi indonesiensis n. sub-sp.
• freshwater fish
• Siluriformes
• Pangasiidae
• Pangasius krempfi
• Pangasius kunyit
• Pangasius mekongensis
• Pangasius sabahensis
• South East Asia