Abstract
Parabreviscolexniepini is a recently described caryophyllidean monozoic tapeworm from schizothoracine fish on the Tibetan Plateau. In the present study, the complete mitochondrial genome of P.niepini is determined for the first time. The mitogenome is 15,034 bp in length with an A+T content of 59.6%, and consists of 12 protein-encoding genes, 22 tRNA genes, two rRNA genes, and two non-coding regions. The secondary structure of tRNAs exhibit the conventional cloverleaf structure, except for trnS1(AGN) and trnR, which lack DHU arms. The anti-codon of trnS1(AGN) in the mitogenome of P.niepini is TCT. The two major non-coding regions, 567 bp and 1428 bp in size, are located between trnL2 and cox2, trnG and cox3, respectively. The gene order of P.niepini shows a consistent pattern with other caryophyllideans. Phylogenetic analysis based on mitogenomic data indicates that P.niepini has a close evolutionary relationship with tapeworms Breviscolexorientalis and Atractolytocestushuronensis.
Highlights
The Caryophyllidea is an ancient group of tapeworms, consisting of four families, 42 genera, and approximately 190 species parasitic in cypriniform and siluriform fishes in most zoogeographical regions (Scholz and Oros 2017)
Parabreviscolex niepini were collected from the schizothoracine fish Schizopygopsis younghusbandi Regan, 1905 in the Yarlung Tsangpo River at Linzhi (29°39'N, 94°21'E), Tibet, China, and the specimens were fixed in 100% ethanol and stored at Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences
We considered that the researchers have misidentified the two common tapeworms Khawia sinensis and Khawia japonensis (Yamaguiti, 1934) from the common carp
Summary
The Caryophyllidea is an ancient group of tapeworms, consisting of four families, 42 genera, and approximately 190 species parasitic in cypriniform and siluriform fishes in most zoogeographical regions (Scholz and Oros 2017). Some caryophyllideans, especially those in cyprinids (e.g. Khawia sinensis Hsü, 1935), cause severe fish diseases. The simplification and limited number of morphological characters cause species identification and taxonomic classification is problematic. Maternal inheritance and rapid evolution have proven to be key factors in phylogenetic studies in tapeworms, making mitochondrial DNA a powerful marker for species identification (e.g. Brabec et al 2012; Li et al 2017)
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