Suárez-Morales Eduardo, Carrera-Parra Luis F
El Colegio de la Frontera Sur (ECOSUR), Unidad Chetumal, Av. Centenario Km. 5.5, Chetumal, Quintana Roo 77014, Mexico.
Folia Parasitol (Praha). 2012 Sep;59(3):221-8. doi: 10.14411/fp.2012.030.
Abstract: In a study of the benthic polychaete fauna of the southern Gulf of Mexico and the Caribbean Sea, several specimens of the terebellid polychaete Scionides reticulata (Ehlers) were found to host endoparasitic copepods that represent an undescribed species of the rare cyclopoid genus Entobius Dogiel, 1948. The new species, E. scionides sp. n., can be distinguished from its congeners by a combination of characters including a genital region without constrictions, three-segmented antennules, a reduced antenna with a blunt terminal process, reduced ornamentation of endopods of legs 1-4 and its relatively small size (2.3-2.7 mm). It is the smallest species of the genus. Comments on immature females are also provided, but males of this species remain unknown. It has a high prevalence (53%) in populations of the terebellid S. reticulata in the southern Gulf of Mexico, but it is absent from the Caribbean. This is the first occurrence of this copepod genus in the Americas. The finding of the new species of Entobius in S. reticulata confirms the strict specificity of most members of the genus and expands the host range of this copepod genus. A key for the identification of the species of Entobius is provided.
在一项对墨西哥湾南部和加勒比海底栖多毛类动物区系的研究中，发现多毛类缨鳃虫科的网纹缨鳃虫（Scionides reticulata，埃勒斯）的几个标本寄生于内寄生桡足类动物，这些桡足类动物代表了罕见的剑水蚤属（Entobius，多吉尔，1948年）中一个未描述的物种。新物种Entobius scionides sp. n. 可通过以下一系列特征与同属其他物种区分开来：生殖区域无缢缩，触角分三节，触角缩短且末端钝圆，第1至4对步足内肢装饰减少，体型相对较小（2.3 - 2.7毫米）。它是该属中最小的物种。文中还对未成熟雌性进行了描述，但该物种的雄性仍未被发现。在墨西哥湾南部的网纹缨鳃虫种群中，其感染率很高（53%），但在加勒比海未发现。这是该桡足类属在美洲的首次出现。在网纹缨鳃虫中发现Entobius新物种，证实了该属大多数成员具有严格的宿主特异性，并扩大了该桡足类属的宿主范围。文中提供了Entobius属物种的鉴定检索表。
