Dark Red Spiked Crab w/ Blue Markings

There are 3 tameable creatures with this look.

Dark Red Spiked Crab w/ Blue Markings
Can Be Tamed
Timeless Isle
Retains its original name after taming.
To increase your chances of the Monstrous Spineclaw spawning, keep killing all the other Spineclaws that can be found along the coastline of the southern half of the isle.
Can Be Tamed
50Gorgonian Outlook, Nazjatar
These crabs may be phased. If so, they can still be viewed and pulled out of the area for taming from the adjacent area to the west: The Empress's Approach.
Can Be Tamed
50Newhome, Nazjatar
Normally friendly to both factions, but can be tamed if you use the toy "N'lyeth, Sliver of N'Zoth" while in War Mode. Tinitoa wears a silver crown that is lost upon taming.
Level scaling: In Shadowlands most NPCs will scale with the Hunter's level, within the constraints of their level range. Hunters can tame regular NPCs up to 2 levels higher than them, but can only tame elite NPCs of the hunter's level or below.