Everybody did and does.
Every reference (e.g. Wikipedia, EOL) you can find lists the giant otter shrew Potamogale velox (Du Chaillu 1860, Nicoll 1985) as a tenrec… and I don’t know why. But I’m willing to learn, if anyone can offer up an explanation based on phylogenetic analysis.
Both shrews have
canine-like medial incisors and lack canine-like canines. Both have a skull shorter than half the presacral length. Both have a relatively small scapula. And a long list of minor traits. Shifting Potamogale to Tenrec adds 30 steps to the LRT.
Based on the shape of the more plesiomorphic dentition
Potamogale (Fig. 1) is the more primitive taxon compared to Scutisorex (Fig. 2). Neither is very much like Tenrec (Fig. 3).
Du Chaillu P 1860. Descriptions of mammals from equatorial Africa. Proceedings of the Boston Society of Natural History, 7, 358–369.
Nicoll M 1985. The biology of the giant otter shrew *Potamogale velox*. National Geographic Society Research Reports, 21: 331-337.