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Several taxa of birds have been named in his honor, including the Cretaceous genus Alexornis and the tanagers Wetmorethraupis sterrhopteron and Buthraupis wetmorei.
The Black-capped Hemispingus (Hemispingus atropileus) is a species of bird in the Thraupidae family.
The Black-eared Hemispingus (Hemispingus melanotis) is a species of bird in the Thraupidae family.
No secure identification of Contursi Terme, where ancient remains confirm a settlement at the confluence of the Tanagro (ancient Tanager) with the Sele, is likely.
The Drab Hemispingus (Hemispingus xanthophthalmus) is a species of bird in the Thraupidae family.
Traditionally considered a bunting and placed in the family Emberizidae, it is actually neither a bunting nor a true finch, but belongs to a group of finch-like birds or tanager-finches in the family Thraupidae.
The lesser seed-finches are two species of Thraupids in the genus Oryzoborus.
It was first roughly charted in 1898 by a German expedition under Carl Chun, and was recharted and named in December 1927 by the First Norvegia Expedition under Captain Harald Horntvedt.
The Oleaginous Hemispingus (Hemispingus frontalis) is a species of bird in the Thraupidae family.
The Orange-browed Hemispingus (Hemispingus calophrys) is a species of bird in the Thraupidae family that can be found in Bolivia and Peru.
Schiedea verticillata, known as the Nihoa Carnation, is an endangered species of carnation, endemic to the island of Nihoa in the Northwestern Hawaiian Islands, where it was discovered in 1923 by the Tanager Expedition.
It resembles the overall greener Green-headed Tanager; a species confusingly known as the Seven-coloured Tanager (saíra-sete-cores) in Portuguese.
In Brazil, where it was introduced from India during Portuguese colonization, it has dispersed spontaneously in the wild in some places, as its fruits are eagerly sought by various native birds such as thrushes, tanagers and the Great Kiskadee.
Pollination occurs probably by insects, although the flowers are visited by many birds such as tanagers, hummingbirds and orioles.
The Tanager Expedition was a series of five biological surveys of the Northwestern Hawaiian Islands conducted in partnership between the Bureau of Biological Survey and the Bishop Museum, with the assistance of the U.S. Navy.
The Three-striped Hemispingus (Hemispingus trifasciatus) is a species of bird in the Thraupidae family.