Based on specimens collected from eulittoral zone in rocky shores of northeast of Rio de Janeiro (Brazil) on 2017, two new tanaidaceans species from two different suborders are described: Apseudomorpha brasiliensis sp. nov. (Apseudomorpha, Metapseudidae) and Pseudozeuxo fischeri sp. nov. (Tanaidomorpha, Pseudozeuxidae). Diagnostic characters of Apseudomorpha brasiliensis are mandible palp article-2 and article-3 with six and nine finely penicillate setae on inner margin, respectively; pereopod-1 carpus and propodus with two and four ventral spines, respectively; pleonites 2 and 5 with pleura having long distal seta; uropod exopod shorter than endopod articles 1–2 combined, endopod four-articled. Pseudozeuxo fischeri is characterized by pereopods 1–3 coxa with long seta about half as long as basis; pereopods 2–3 carpus with ventrodistal seta; propodus with two ventral setae; pereopods 4–6 propodus with two ventral spines and one seta; uropod endopod two- and exopod one-articled. This is the first record of the family Pseudozeuxidae and the metapseudid subfamily Metapseudinae from the Southwestern Atlantic (Brazil). Remarks on their associations with macroalgae and identification keys to world species of Apseudomorpha and Pseudozeuxo are provided.

中文翻译：

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大西洋西南部伪足科和变伪足科（Metapseudidae）（甲壳纲，Tanaidacea）的首次记录，并描述了两个新物种

根据 2017 年从里约热内卢（巴西）东北部岩石海岸的绝光带收集的标本，描述了来自两个不同亚目的两个新的 tanaidaceans 物种：Apseudomorpha brasiliensis sp。十一月 (Apseudomorpha, Metapseudidae) 和 Pseudozeuxo fischeri sp。十一月 (Tanaidomorpha, Pseudozeuxidae)。Apseudomorpha brasiliensis 的诊断特征是下颌触须第2条和第3条，内缘分别有6条和9条细的青霉刚毛；pereopod-1 carpus 和 propodus 分别有两个和四个腹刺；pleonites 2 和 5 胸膜有长的远端刚毛；尾足类外足类比内足类第 1-2 条组合短，内足类有 4 条。Pseudozeuxo fischeri 的特征是前足类动物 1-3 节，具长刚毛，长度约为基部的一半；pereopods 2-3 腕具腹远端刚毛；前足有两个腹侧刚毛；pereopods 4-6 propodus 有两个腹刺和一个刚毛；尾足类内足类两篇和外足类一篇。这是来自西南大西洋（巴西）的 Pseudozeuxidae 科和 metapseudid 亚科 Metapseudinae 的首次记录。提供了关于它们与大型藻类的关联的评论以及对伪形目和伪足目世界物种的识别关键。