Alignments of ITS1 gene sequences from Harpacticella inopinata

Ancient lakes are hotspots of species diversity and pose challenges and opportunities for exploration of the dynamics of endemic diversification. Lake Baikal in Siberia, the oldest lake in the world, hosts a particularly rich crustacean fauna, including the largest known species flock of harpacticoid copepods with some 70 species. Here we focused on exploring the diversity and evolution within a single nominal species Harpacticella inopinata Sars, 1908 using molecular markers (mitochondrial COI, nuclear ITS1 and 28S rRNA) and a set of qualitative and quantitative morphological traits. Five major mitochondrial lineages were recognized, with model-corrected COI distances 0.20-0.37. A concordant pattern was seen in a nuclear data set, and qualitative morphological traits also distinguish a part of the lineages. All this suggests the presence of several hitherto unrecognized cryptic taxa within the baikalian H. inopinata, with long independent histories. The abundances, distributions, and i..., Sanger sequencing of ITS1 rRNA gene. The detailed description of the methods are included in the published paper (https://doi.org/10.1002/ece3.11471), , # Alignments of ITS1 gene sequences from Harpacticella inopinata [https://doi.org/10.5061/dryad.qrfj6q5nr](https://doi.org/10.5061/dryad.qrfj6q5nr) This dataset includes alignments of ITS1 gene sequences from harpacticoid copepod *Harpacticella inopinata* sampled in Lake Baikal. ## Description of the data and file structure The alignments are submitted in .fasta format. The sequence name corresponds to the geographic location and number of specimens.古湖泊是物种多样性的热点区域，同时为探究特有类群分化动态带来了挑战与机遇。位于西伯利亚的贝加尔湖是世界上最古老的湖泊，拥有极为丰富的甲壳动物区系，其中包含已知规模最大的猛水蚤类桡足动物（harpacticoid copepods）类群，涵盖约70个物种。本研究聚焦于单一名义物种意外猛水蚤（Harpacticella inopinata Sars, 1908）内部的多样性与演化历程，采用分子标记（线粒体COI基因、核ITS1及28S rRNA）与一系列定性、定量形态学性状开展研究。研究共识别出5个主要的线粒体谱系，经模型校正后的COI遗传距离为0.20-0.37。核基因组数据集也呈现出一致的演化模式，部分谱系可通过定性形态学性状加以区分。上述结果表明，贝加尔湖产的意外猛水蚤内部存在数个此前未被发现的隐存类群，且各自拥有漫长的独立演化历史。本研究涉及物种丰度、分布范围及[原文此处存在截断]，以及ITS1 rRNA基因的Sanger测序。实验方法的详细描述已发表于论文（https://doi.org/10.1002/ece3.11471）。# 意外猛水蚤（Harpacticella inopinata）ITS1基因序列比对集 https://doi.org/10.5061/dryad.qrfj6q5nr 本数据集包含采自贝加尔湖的猛水蚤类桡足动物（harpacticoid copepods）意外猛水蚤（Harpacticella inopinata）的ITS1基因序列比对结果。 ## 数据与文件结构说明 所有序列比对文件均以.fasta格式存储，序列名称与标本的采样地理区域及标本编号一一对应。