三种新的 Cosmetocleithrum 种（单殖吸虫目：Dactylogyridae）寄生在东南巴西的 Trachelyopterus galeatus（Siluriformes：Auchenipteridae）的鳃上的寄生虫。
Three New Species of Cosmetocleithrum (Monogenea: Dactylogyridae) Gill Parasites of Trachelyopterus galeatus (Siluriformes: Auchenipteridae) in Southeastern Brazil.
机构信息
Instituto de Biociências, Setor de Parasitologia, UNESP, Univ Estadual Paulista, Campus de Botucatu, Botucatu, SP, Brazil.
Departamento de Ciências Biológicas, Universidade Regional do Cariri (URCA), Crato, CE, Brazil.
出版信息
Acta Parasitol. 2021 Jun;66(2):436-445. doi: 10.1007/s11686-020-00282-3. Epub 2020 Oct 19.
PURPOSE
To describe three new species of Cosmetocleithrum in the gills of Trachelyopterus galeatus (Siluriformes, Auchenipteridae) from Aguapeí River, Upper Paraná River basin, São Paulo State, Brazil.
METHODS
Fifty-three specimens of T. galeatus were captured in the mouth of the Aguapeí River from August 2013 to June 2014. Monogeneans were mounted unstained in Hoyer's and Gray and Wess's medium.
RESULTS
Cosmetocleithrum spathulatum sp. n., Cosmetocleithrum baculum sp. n., and Cosmetocleithrum galeatum sp. n. differ from all known congeneric species mainly in the morphology of the accessory piece (i.e. spatulate-shaped, claviform, and a straight rod with hook-shaped distal portion, respectively). Also, the three new species share hooks with different sizes with hooks pairs 5 and 7 bigger than others and with an erect delicate point, inconspicuous thumb, longer shaft, and slender shank.
CONCLUSIONS
To date, 18 species of Cosmetocleithrum were recognised parasitizing siluriforms in the Neotropical region. The present study expands the number to 21 species, however, despite this increase, the number of known taxa of monogeneans in neotropics is far from representing the ideal situation.
目的
描述在巴西圣保罗州上巴拉那河流域 Aguapeí 河中 Trachelyopterus galeatus（Siluriformes，Auchenipteridae）鳃上的三种新的 Cosmetocleithrum 物种。
方法
2013 年 8 月至 2014 年 6 月期间，从 Aguapeí 河口捕获了 53 个 T. galeatus 标本。单殖吸虫未染色，用 Hoyer 氏、Gray 和 Wess 氏介质固定。
结果
Cosmetocleithrum spathulatum sp. n.、Cosmetocleithrum baculum sp. n. 和 Cosmetocleithrum galeatum sp. n. 与所有已知同种物种的主要区别在于附加片的形态（即，分别为匙形、棒形和带有钩形远端的直杆）。此外，这三个新物种还具有不同大小的钩子，第 5 对和第 7 对钩子比其他钩子大，并且具有直立的精致尖端、不明显的拇指、更长的轴和更细的柄。
结论
迄今为止，在新热带地区已发现 18 种寄生在 Siluriformes 上的 Cosmetocleithrum 物种。本研究将其数量增加到 21 种，但尽管有这种增加，新热带地区已知单殖吸虫的分类群数量还远远没有达到理想的状态。
Zotero 插件