Fig. 2

Maximum likelihood phylogentic tree for Marshallagia species based on cytochrome c oxidase subunit 1 (cox1) gene. Teladorsagia circumcincta was used as the outgroup while Ostertagia lanceata was included since data are annotated as Marshallagia lanceata in GenBank. Branch support is presented with results of the rapid bootstrap analysis before and of the Shimodaira-Hasegawa approximate likelihood ratio test behind the slash. Seven highly supported clusters (indicated by Roman numbers I-VII from basal to distal) are considered valid species: O. lanceatea (I); M. sogdiana (II); M. trifida (III) including the morphotype M. schumakovitschi; the presumably misidentified M. occidentalis from China (IV); M. hsui (V); M. marshalli (VI) including the morphotypes M. occidentalis and M. uzbekistanica from Uzbekistan; and M. mongolica (VII) including the morphotype M. grossospiculum and a presumably misidentified M. marshalli from China. If more than one morphotype is present in a cluster, the valid species name is printed in bold. Numbers after species names show voucher designations from Lv et al. [44] while M1–M14 are voucher designations from the present study. Abbreviations: CN, China; UZ, Uzbekistan; ?, apparently misidentified specimens