Glossidiella peruensis sp. nov., a new digenean (Plagiorchiida: Plagiorchiidae) from the lung of the brown ground snake Atractus major (Serpentes: Dipsadidae) from Peru

ABSTRACT During a survey of helminth parasites of the brown ground snake, Atractus major Boulenger, 1894 (Serpentes: Dipsadidae) from Moyobamba, region of San Martin (northeastern Peru), a new species of Glossidiella Travassos, 1927 (Plagiorchiida: Plagiorchiidae) was found and is described herein based on morphological and ultrastructural data. The digeneans found in the lung were measured and drawings were made with a drawing tube. The ultrastructure was studied using scanning electron microscope. Glossidiella peruensis sp. nov. is easily distinguished from the type- and only species of the genus, Glossidiella ornata Travassos, 1927, by having an oblong cirrus sac (claviform in G. ornata), distinctly ovate testes (rounded testes in G. ornata) and button-like papillae on the dorsal edge of the oral sucker region (absent in G. ornata). In addition, G. peruensis sp. nov. differs from G. ornata by possessing a longer distance between testes and substantially wider oral and ventral suckers. This is the first time that a species of digenean is described and reported parasitizing snakes in Peru.

摘要
本研究对秘鲁东北部圣马丁大区莫约班巴地区的棕地蛇（*Atractus major* Boulenger, 1894，蛇亚目：钝头蛇科 Dipsadidae）的蠕虫寄生虫开展调查期间，发现了Glossidiella Travassos, 1927（斜睾目 Plagiorchiida：斜睾科 Plagiorchiidae）的一个新物种，并基于形态学与超微结构数据对其进行正式描述。
研究人员对寄生于宿主肺部的复殖吸虫（digenean）进行了形态测量，并借助显微镜绘图管绘制了其结构线条图；同时采用扫描电子显微镜（scanning electron microscope）对其超微结构进行观察分析。
该新种（*Glossidiella peruensis* sp. nov.）可与该属的模式种（亦是目前唯一已知物种）华丽Glossidiella（*Glossidiella ornata* Travassos, 1927）明确区分：其阴茎囊（cirrus sac）呈长椭圆形，华丽Glossidiella的阴茎囊为棒形；其睾丸（testes）明显呈卵圆形，华丽Glossidiella的睾丸则为圆形；其口吸盘（oral sucker）区域背缘具纽扣状乳突，该结构在华丽Glossidiella中缺失。
此外，秘鲁Glossidiella新种的睾丸间距更长，口吸盘与腹吸盘（ventral sucker）显著更宽大，进一步与华丽Glossidiella形成差异。
本研究为秘鲁境内首次正式报道并描述寄生于蛇类的复殖吸虫新物种。