Description of a new species of Hedruris Nitzsch, 1821 (Nematoda, Hedruridae) from freshwater turtles in Argentina, with information on its life cycle and a review of the genus’s host and geographic distribution

Hedruris dratini n. sp. (Nematoda, Hedruridae) is described from freshwater turtles in Argentina and information about its life cycle provided. The new species differs from the remaining species of the genus by possessing an excretory pore, and the nerve ring and deirids being positioned at equal distance from the anterior end. Additionally, H. dratini n. sp. has mammilated eggs and males possess nine pairs of caudal papillae. The first life cycle within the genus including an amphipod as intermediate host and a reptile as a definitive host is presented. Furthermore, the host and geographic distribution of species of the genus Hedruris Nitzsch, 1821 are analyzed. Although the genus has a cosmopolitan distribution and parasitizes a great diversity of hosts, the majority of its species follow a Gondwanian distribution and its preferred hosts are amphibians.

本研究记述了采自阿根廷淡水龟体内的赫德里属德拉蒂尼新种（Hedruris dratini n. sp.，线虫动物门（Nematoda），赫德里科（Hedruridae）），并对其生活史相关信息进行了报道。该新种与该属其余物种的区别在于具有排泄孔，且神经环与颈乳突（deirids）距前端的距离相等。此外，该新种的卵具乳突状突起，雄虫具有9对尾乳突（caudal papillae）。本研究首次报道了该属内首个以端足类动物（amphipod）为中间宿主、爬行动物为终末宿主的生活史。此外，本研究还分析了1821年Nitzsch建立的赫德里属（Hedruris Nitzsch, 1821）各物种的宿主与地理分布格局。尽管该属物种广布全球，可寄生于多样的宿主类群，但绝大多数物种呈现冈瓦纳分布特征，且其偏好宿主为两栖动物。