FIGURE 12 in Equine Strongylidae and other parasitic nematodes described by Arthur Looss during 1895-1911 in the collections of the Swedish Museum of Natural History

FIGURE 12. Drawings illustrating the variability in muscle arrangement in the female posterior end of Petrovinema poculatum (Looss, 1900) Ershov, 1943 (= Cyathostomum poculatum Looss, 1900), Cylicocyclus radiatus (Looss, 1900) Chaves, 1930 (= Cyathostomum radiatum Looss, 1900) and Cylicocyclus elongatus (Looss, 1900) Chaves, 1930 (= Cyathostomum elongatum Looss, 1900).