El Colegio de la Frontera Sur, Unidad Chetumal, Departamento de Sistemática y Ecología Acuática, Chetumal, Quintana Roo, 77014, Mexico.
Natural History Museum of Los Angeles County, Allan Hancock Foundation Polychaete Collection, Los Angeles, CA, USA.
Syst Parasitol. 2021 Apr;98(2):111-117. doi: 10.1007/s11230-021-09964-6. Epub 2021 Mar 8.
The cyclopoid copepod family Bradophilidae includes a few species of mesoparasitic copepods infecting flabelligerid polychaetes. It contains two species of Bradophila Levinsen, 1878, the type genus: B. pygmaea Levinsen, 1878 and B. minuta Boxshall, O'Reilly, Sikorski & Summerfield, 2019, both known from North Europe. Two other genera (i.e., Trophoniphila M'Intosh, 1885 and Flabellicola Gravier, 1918) have some affinities with this family including their host preference. Mesoparasitic copepods are highly specialized, morphologically reduced forms. Part of their body (endosoma) is partially lodged in the host body and the other part is external (ectosoma); both parts are connected by an intersomital stalk. Infection by these copepods can be readily detected by the presence of the egg-carrying ectosoma on the host external surface. From the analysis of flabelligerid polychaetes collected in 2012 from the Chukchi Sea, two ovigerous female individuals of a bradophilid copepod were recorded. These specimens were recognized as representative of an undescribed species of Bradophila. The new species, B. susanae n. sp., shows the generic diagnostic characters and differs from its two other known congeners in several respects, including the cuticular ectosomal ornamentation, body proportions, size of the intersomital stalk, position of the genital pore, and shape and arrangement of egg sacs. Also, the new species ectosomal size range (0.440 - 0.450 μm) falls between the size range of its two known congeners. Our finding expands the known host range of bradophilid copepods to include a new flabelligerid host, Bradabyssa nuda (Annenkova-Chlopina) from the Russsian Arctic region.
哲水蚤科包括一些寄生在缨须虫多毛类环节动物身上的中型寄生桡足类。它包含两个布拉多菲拉属的物种，即 1878 年 Levinsen 建立的模式属布拉多菲拉属，以及 1878 年 Levinsen 和 1918 年 Gravier 建立的 B. minuta Boxshall、O'Reilly、Sikorski 和 Summerfield，这两个物种都分布于北欧。另外两个属（即 Trophoniphila M'Intosh，1885 和 Flabellicola Gravier，1918）与该科有一些亲缘关系，包括它们对宿主的偏好。中型寄生桡足类是高度特化的、形态上简化的形式。它们的部分身体（内体）部分位于宿主体内，另一部分位于外部（外体）；这两部分通过一个体节间柄连接。这些桡足类的感染可以通过在宿主外表面上携带卵的外体很容易地被检测到。通过对 2012 年在楚科奇海采集的缨须虫多毛类的分析，记录到了两种布拉多菲拉科桡足类的产卵雌性个体。这些标本被认为是一种未描述的布拉多菲拉属的代表。新种，B. susanae n. sp.，表现出属的诊断特征，与其他两种已知的同属种在几个方面不同，包括表皮外体装饰、身体比例、体节间柄的大小、生殖孔的位置以及卵囊的形状和排列。此外，新种的表皮外体大小范围（0.440-0.450 μm）介于其两种已知同属种的大小范围之间。我们的发现将布拉多菲拉科桡足类的已知宿主范围扩大到包括俄罗斯北极地区的一种新的缨须虫多毛类宿主，B. nuda（Annenkova-Chlopina）。
