What is the primary difference between Peculiar galaxies and standard Irregular galaxies?

Answer

Peculiar galaxies are singled out because their appearance is explicitly linked to dynamic processes like mergers

While Peculiar galaxies are technically a subset of the irregular category, they are singled out because their highly disturbed appearance (bridges, tails) is explicitly linked to dynamic processes like tidal interactions or mergers.

What is the primary difference between Peculiar galaxies and standard Irregular galaxies?
classificationgalaxiesastronomyproperties