50MI_UCEs.nex is the alignment consisting of 39,966 bp and 205 individuals of the 'most informative' loci as determined by the phyluce 'get informative sites' script.
95perUCEs.nex is an alignment containing 95% of all sequenced individuals, which reduced the dataset to 60,308 bp in length (concatenated form).
512UCELoci_Concat.nex is a concatenated alignment of 512 UCE loci for 193 of the total 208 individuals.
4176_loci_concat.nex is the complete UCE matrix across 204 individuals.