Description of a new lung fluke species, Paragonimus vietnamensis sp. nov. (Trematoda, Paragonimidae), found in northern Vietnam.
Based on morphology of metacercariae and adult worms together with molecular data from our previous study, we describe herein a new lung fluke species named Paragonimus vietnamensis sp. nov. Metacercariae of this new species is round and extremely large in size (nearly 800 mum in diameter) having a fragile outer cyst of variable thickness and a thin fragile inner cyst. There are little or no space between metacercaria and the inner cyst wall. These and other morphological features of metacercariae of P. vietnamensis sp. nov. are not completely identical with but have some similarities with those of P. microrchis, P. proliferus, or P. menglaensis. On the other hand, adult worms obtained by experimental infection of these large metacercariae are oval in shape, having a ventral sucker slightly larger than the oral one, and having singly arranged relatively short cuticular spines. These morphological features of adult worms are partly similar to but not identical with those of P. microrchis, P. skrjabini, P. yunnanenis, P. xiangshanensis, or P. harinasutai. Taken these morphological data and our previous molecular phylogenetic analyses of ITS2 and CO1 sequences of metacercariae and adult worms together, P. vietnamensis sp. nov. is different from any other known Paragonimus spp.
Department of Parasitology, Institute of Ecology and Biological Resources, Vietnamese Academy of Science and Technology, Hanoi, Vietnam. pndoanh@iebr.vast.ac.vn
Pham Ngoc
PN
Doanh
Akio
A
Shinohara
Yoichiro
Y
Horii
Shigehisa
S
Habe
Yukifumi
Y
Nawa
Nguyen Thi
NT
Le
D000818:Animals; D002371:Cat Diseases / Q000469:parasitology; D002415:Cats / Q000469:parasitology; D004283:Dog Diseases / Q000469:parasitology; D004285:Dogs / Q000469:parasitology; D005243:Feces / Q000469:parasitology; D008168:Lung / Q000469:parasitology*; D010237:Paragonimiasis / Q000453:epidemiology / Q000469:parasitology* / Q000662:veterinary; D010238:Paragonimus / Q000033:anatomy & histology / Q000145:classification* / Q000254:growth & development / Q000302:isolation & purification; D010270:Parasite Egg Count; D014744:Vietnam / Q000453:epidemiology