We used the query:
"ecological metagenomes"[Organism]
AND (CO1 OR COI OR COX1)
AND (cluster\_public[prop]
AND "biomol dna"[Properties])
AND ("filetype fastq"[Properties])
On the NCBI SRA site on March 17th of 2020
https://www.ncbi.nlm.nih.gov/sra/?term=%22ecological+metagenomes%22%5BOrganism%5D++AND+(CO1+OR+COI+OR+COX1)++AND+(cluster%5C_public%5Bprop%5D++AND+%22biomol+dna%22%5BProperties%5D)++AND+(%22filetype+fastq%22%5BProperties%5D)
[Current datasets found here][1]
Datasets were then parsed by hand for only Arthropod datasets of just the COX1 gene (no multiplexing)
[1]: https://www.ncbi.nlm.nih.gov/sra/?term=%22ecological%20metagenomes%22%5BOrganism%5D%20%20AND%20%28CO1%20OR%20COI%20OR%20COX1%29%20%20AND%20%28cluster%5C_public%5Bprop%5D%20%20AND%20%22biomol%20dna%22%5BProperties%5D%29%20%20AND%20%28%22filetype%20fastq%22%5BProperties%5D%29