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.