Oh i thought the tail was like an ice pick. So it's just for swimming?

yeah, these guys don't need anything but their claws to dig in ice

Is it possible that the Wolvershrog would be reclassified into the genus Luterursus? Or is it still in the genus Lutrasorex?

This is a distinct genus from its ancestor.

I like they're use of bones in tools, though it makes me wonder if they use them in their construction of nests, or if they just rely on snow. Do they use particularly large bones of megafauna to denote territory boundaries, perhaps even marring their surfaces with claw scratches to denote information on the individual(s) that placed them?

Approval Checklist:
Art:
Art Present?:y
Art clear?:y
Gen number?:y
All limbs shown?:y
Reasonably Comparable to Ancestor?:y
Realistic additions?:y

Name:
Binomial Taxonomic Name?:y
Creator?:y

Ancestor:
Listed?:y
What changes?:
External?: tail reverted to swimming purpose, loss of defensive spines
Internal?:
Behavioral/Mental?: use of "bones" as spears, simpler social stuff, pack food in ice for later, 2 year mating pair
Are Changes Realistic?:
New Genus Needed?: (If yes, list why)

Habitat:
Type?:1
Flavor?:2
Connected?:y
Wildcard?:

Size:
Same as Ancestor?:n
Within range?:y
Exception?:

Support:
Same as Ancestor?:n
Does It Fit Habitat?:y
Reasonable changes (if any)?:y elaborated
Other?:

Diet:
Same as Ancestor?:n
Transition Rule?:y
Reasonable changes (if any)?:y, meat obligate

Respiration:
Same as Ancestor?:y
Does It Fit Habitat?:y
Reasonable changes (if any)?:
Other?:

Thermoregulation:
Same as Ancestor?:y
Does It Fit Habitat?:y
Reasonable changes (if any)?:
Other?:

Reproduction:
Same as Ancestor?:y
Does It Fit Habitat?:y
Reasonable changes (if any)?:
Other?:

Description:
Length?: good
Capitalized correctly?: yesss?
Replace/Split from ancestor?:replaced
Other?:

Opinion: Approved

Agreed