(2016) discussed potential effects of climate change on the ecology of Marshallagia
marshalli, an important abomasal parasite of muskoxen, wild sheep, and caribou.
Fecal examination revealed a variety of helminth parasites viz., Haemonchus contortus, Ostertagia trifurcata, Trichostrongylus spp., Strongyloides papillosus, Marshallagia
marshalli, Avitellina centripunctata, Fasciola gigantica and F.
All Oesophagostomum isolates were grouped in a sister clade, including Trichostrongylus colubriformis and Marshallagia
marshalli, which suggested their close relationships with the two Oesophagostomum spp.