title: Structural differences in the egg envelopes of Haemonchus contortus and Trichostrongylus colubriformis (Nematoda: Trichostrongylidae).
mesh_terms: D000818:Animals; D005260:Female; D006652:Histological Techniques; D008854:Microscopy, Electron; D010063:Ovum / Q000033:anatomy & histology; D014251:Trichostrongyloidea / Q000254:growth & development*; D014252:Trichostrongyloidiasis / Q000175:diagnosis