The tanaidacean family Colletteidae is large and exhibits highly diverse morphologies. A significant structural feature, the cephalothorax-cheliped attachment, is one of the sources of this variation but is still poorly understood or resolved in phylogenetic terms. The presence (and wide intrafamily disparities) of a lateral carapacial sclerite associated with this articulation is the main contributor to the diversity and this is investigated by us and shown to have valuable information for paratanaoidean phylogenies. We used integrative taxonomy to evaluate the status of several described colletteid genera, Caudalonga, Macrinella and Pseudoarthrura, based on analysis of COI and 18S genes, comparison with molecular data from ten other paratanaoidean families and detailed morphological study including confocal imaging of whole specimens, with the ‘sclerite’ a prime target for analysis. The results supported the establishment of a new family, Caudalongidae fam. nov., extracted from the overburdened Colletteidae, the narrow-bodied taxa defined principally by the small cheliped sclerite partly covered by a wide membrane and a short one-articled uropodal exopod. Apart from redescriptions/redefinitions of the genera Caudalonga, Macrinella, and Pseudoarthrura, two new genera Facultatotanais gen. nov. and Universitatotanais gen. nov. are erected and six new species are described, Caudalonga kurilensis sp. nov., F. bios sp. nov., U. freie sp. nov., U. gandavensis sp. nov., U. harvardi sp. nov., and U. jagiellonensis sp. nov. The Clarion Clipperton-Fracture Zone appears to support a high diversity of the family.

中文翻译：

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综合分类学支持建立新的深海Tanaidacea科（Peracarida）

tanaidacean 科 Colletteidae 体型庞大，形态多样。头胸部螯足附着是一个重要的结构特征，是这种变异的来源之一，但在系统发育方面仍然知之甚少或无法解决。与该关节相关的侧甲骨片的存在（以及广泛的科内差异）是多样性的主要贡献者，我们对此进行了研究，并证明对 paratanaoidean 系统发育有有价值的信息。基于 COI 和 18S 基因的分析、与其他 10 个 paratanaoidean 科的分子数据比较以及详细的形态学研究（包括整个标本的共聚焦成像），我们使用综合分类法评估了几个已描述的 colletteid 属、Caudalonga、Macrinella 和 Pseudoarthrura 的状态。 “骨片”是分析的主要目标。结果支持建立一个新科，Caudalongidae 家族。 11 月，从负担过重的 Colletteidae 中提取，这是一种窄体类群，主要由部分被宽膜和短单尾足外足覆盖的小螯足骨片定义。除了 Caudalonga 属、Macrinella 属和 Pseudoarthrura 属的重新描述/重新定义之外，两个新属 Facultatotanais gen.十一月和Universitatotanais gen。十一月建立并描述了六个新物种，Caudalonga kurilensis sp。十一月，F.bios sp。 11 月，U. freie sp。十一月，U.gandavensis sp。 11 月，U. harvardi sp。 11 月，和 U. jagiellonensis sp。十一月Clarion Clipperton-Frecture Zone 似乎支持该家庭的高度多样性。