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Anatomical details of Aspiculuris tetraptera and Strongylda from R. norvegicus. (a) Aspiculuris tetraptera, head; (b) Heligmosomoides polygyrus, male tail; (c) H. polygyrus, female tail; (d) Nippostrongylus brasiliensis, male tail; (e) N. brasiliensis, horizontal striations and longitudinal ridges.
