George Kai Horst, Lehmanski Linda Maria Anne, Kihara Terue Cristina
Senckenberg am Meer, German Centre for Marine Biodiversity Research DZMB, Südstrand 44, 26382, Wilhelmshaven, Germany.
University of Cologne, Biocenter, Zülpicher Str. 47b, 50674, Köln, Germany.
Zookeys. 2020 Nov 25;997:17-46. doi: 10.3897/zookeys.997.56965. eCollection 2020.
The description of (Copepoda, Harpacticoida, Laophontodinae Lang) from the deep sea of the Kairei Field, western Indian Ocean, prompted the examination of the phylogenetic status of T. Scott and the relationships within the genus. The allocation of to based on diagnostic characters was relatively straightforward, yet phylogenetic analysis of the genus considering 39 morphological characters detected not a single autapomorphy. This indicates that , which seems to form a monophylum with George and George, Glatzel & Schröder, actually represents the stem-lineage, retaining the characters of the common ancestor without having developed unique derived morphological characters. Most of the 13 known species of can be characterised by distinct apomorphies. However, phylogenetic comparison highlights some uncertainties due to the apparent heterogeneous distribution of some derived characters across the species, the weakness of other features, and the fragmentary and inadequate description of several species, which, in combination with the unavailability of type material, prevents a detailed comparison of several phylogenetically relevant characters. Thus, the analysis presented here provides a further step towards understanding the systematic relationships of and within , rather than a conclusive answer. Nonetheless, a detailed character discussion and a key to species are given.
对来自印度洋西部凯雷菲尔德深海的（桡足亚纲，猛水蚤目，劳丰猛水蚤亚科朗）的描述促使对T. 斯科特的系统发育地位以及该属内的关系进行研究。基于诊断特征将 归入 相对直接，但考虑39个形态特征对该属进行系统发育分析时未发现单一的自近裔性状。这表明 ，它似乎与乔治和乔治、格拉策尔及施罗德的 构成一个单系群，实际上代表了干群，保留了共同祖先的特征而未发展出独特的衍生形态特征。已知的13种 中的大多数可以通过独特的近裔性状来表征。然而，系统发育比较凸显了一些不确定性，原因在于一些衍生特征在物种间明显分布不均、其他特征的薄弱性以及几个物种的描述零碎且不充分，再加上模式标本不可用，这妨碍了对几个与系统发育相关特征的详细比较。因此，这里给出的分析是朝着理解 的系统关系以及该属内关系迈出的进一步的一步，而非得出结论性答案。尽管如此，仍给出了详细的特征讨论和物种检索表。
