A semi-articulated Notharctus foot represented by AMNH 143612 and AMNH 143640 preserves ray-specific phalanges used to test the identity and function of a digit-two grooming claw; the specimen comparison is not a crown-primate or direct-ancestor claim.
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Notharctus is bounded here by the semi-articulated AMNH 143612/143640 foot from Bridger B, Wyoming, within an approximately 50–48.5 Ma locality interval; its digit-two anatomy does not establish a global genus range or crown-anthropoid ancestry.
claim:taxon:notharctus:fossil-rangeMaiolino and colleagues treat the semi-articulated AMNH 143612 and AMNH 143640 foot as Notharctus for a ray-specific phalangeal comparison; this attribution and comparison do not establish crown-primate membership or direct ancestry.
claim:taxon:notharctus:taxonomyThe profiled Notharctus foot is bounded to AMNH 143612 and AMNH 143640 from the Bridger Formation in Wyoming; this specimen provenance does not establish a complete genus distribution.
claim:taxon:notharctus:biogeographyThe cited Notharctus foot study tests phalangeal function rather than diet, habitual habitat, observed locomotion, population body size or ecological guild; those fields therefore remain unresolved in this profile.
claim:taxon:notharctus:ecologyAMNH 143612 and AMNH 143640 preserve a semi-articulated foot with ray-specific proximal and intermediate phalanges used to infer a digit-two grooming claw; grooming behaviour itself is not observed.
claim:taxon:notharctus:morphology