In this study, we report the second endoparasitic relationship for the oenonid Labrorostratus caribensis, previously described parasitizing a nereid polychaete. The new host is the syllid Haplosyllis rosenalessoae, in which it occupies 2/3 of its body cavity host. This is the second endoparasitic relationship between polychaetes and the first between both partners in known for Brazil, as well as the first record of the parasite outside the type locality (Caribbean) and of the host in the State of Bahia. We discuss on the interest of the finding of these king of parasitic relationships and provide an identification key to all knwon species of Labrorostratus.

在这项研究中，我们报告了拟南芥Carbroensis的第二种寄生虫关系，先前描述了寄生Nereid多毛et。新的寄主是Syllid Haplosyllis rosenalessoae，在其中占据了其体腔寄主的2/3。这是多毛et之间的第二种内寄生关系，以及在巴西为人所知的两个伙伴之间的第一种内寄生关系，也是巴伊亚州（加勒比地区）以外类型的寄生虫和寄主的第一个记录。我们讨论了寻找这些寄生关系之王的兴趣，并提供了识别所有Labrorostratus已知物种的关键。