title: Morphological variation in three mermithids (Nematoda) from Chironomidae (Diptera) and a reassessment of the genera Gastromermis and Hydromermis.
mesh_terms: D000818:Animals; D004175:Diptera; D005260:Female; D007814:Larva; D008297:Male; D009055:Mouth / Q000033:anatomy & histology; D009348:Nematoda / Q000033:anatomy & histology* / Q000145:classification; D013045:Species Specificity