Thanks for bringing that up. I checked the paper with the original description (Newcomb, 1864) and "Common and Scientific Names of Aquatic Invertebrates from the United States and Canada: Mollusks Second Edition". Micrarionta gabbii is correct so I will revert it back.
Unintended disagreements occur when a parent (B) is
thinned by swapping a child (E) to another part of the
taxonomic tree, resulting in existing IDs of the parent being interpreted
as disagreements with existing IDs of the swapped child.
Identification
ID 2 of taxon E will be an unintended disagreement with ID 1 of taxon B after the taxon swap
If thinning a parent results in more than 10 unintended disagreements, you
should split the parent after swapping the child to replace existing IDs
of the parent (B) with IDs that don't disagree.
Roth & Sadeghian and MB say it should be the other way around.