| classification of the main macroscopic lesions produced by larvae of gasterophilus spp. (diptera:gasterophilidae) in free-ranging horses in umbria. | listed and described herein are the main macroscopic lesions produced along the whole digestive tract of free-ranging horses by larvae of the five gasterophilus spp., occurring in umbria, a region of central italy: gasterophilus intestinalis, gasterophilus nasalis, gasterophilus pecorum, gasterophilus inermis, gasterophilus haemorrhoidalis. lesions are classified on the basis of their sizes and shapes and the host's anatomic sites infested, and they are examined in relation to the developmental ... | 1988 | 3335129 |