Did these replace the Spotted Saucebacks of Barlowe?

no

They're like terrestrial flies. I love them, especially the furry sausage one.

Thank goodness they eat at least one non-genus organism.
I wonder if it interacts with the Sauceswarmer? It "is always on the hunt for prey which is often much larger than itself", and the Sauceswarmer's smaller than the Hemoswarmer, which would make it easier to take down.
I like how they are simultaneously familiar and alien. Are they fuzzy botflies or shrews? They're both, and have no eyes.

I didn't see that particular swarmer in the list for its habitats.

They share the Barlowe Temperate Rainforest environment.

I've added it

I've now changed the topic subtitle to something more fitting