It's hard to see how the basionym of a species named in 1774 can involve a genus defined in 1825. See Phipps, Voyage:
https://archive.org/details/voyagetowardsnor00mulg/page/184/mode/2up
In fact Phipps says the binomial is from Linnaeus, but he appears to be talking through his hat. (Ursus, yes; maritimus, no.)
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For some so far unknown reasons the basionym relation is inverted in this case.
Ursus maritimus Phipps, 1774 should be the basionym of Thalarctos maritimus (Phipps, 1774), not the other way around.
Ursus maritimus basionym
It's hard to see how the basionym of a species named in 1774 can involve a genus defined in 1825. See Phipps, Voyage: https://archive.org/details/voyagetowardsnor00mulg/page/184/mode/2up In fact Phipps says the binomial is from Linnaeus, but he appears to be talking through his hat. (Ursus, yes; maritimus, no.)
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