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Dirofilaria tenuis
''Dirofilaria tenuis'' is a species of nematode, a parasitic roundworm that infects the subcutaneous tissue of vertebrates. ''D. tenuis'' most commonly infects raccoons,〔(Studies on the Development of Dirofilaria tenuis Chandler 1942. Warren R. Pistey, The Journal of Parasitology, Vol. 44, No. 6 (Dec., 1958), pp. 613-626 )〕 but some human cases have been reported They are vectored by mosquitoes and follow similar development and transmission patterns as other ''Dirofilaria''.〔
== Morphology ==
Adults of ''D. tenuis'' are long and thin with a pointed anterior end. The posterior end is long, drawn out, and typically remains coiled. It possesses a hook and may have up to fifteen pairs of sensory organs known as papillae covering the posterior region of the body. Females vary in length, from 8–13 cm, averaging about 9 cm, while males are 4-4.8 cm in length, averaging 4.5 cm. ''D. tenuis'' possess eight papillae in addition to two amphids around the mouth opening. The mouth leads to a short esophagus, which is connected to the intestine and leads to the excretory opening. ''D. tenuis'' also possesses a nerve cord at the anterior end of the body cavity and differentiated reproductive organs. The outermost surface of the cuticle, or outer covering of the worm, is covered in small lines running transversely and more prominent ridges arranged longitudinally. These ridges are less prominent at the head and anal ends. The combination of the transverse lines and longitudinal ridges can give ''D. tenuis'' a beaded appearance.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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