Species described (5):
- Ameiurus obesus Gill, 1861, synonym
- Anableps dowei Gill, 1861 (Anableps), valid
- Atractosteus tropicus Gill, 1863 (Atractosteus), valid
- Centropomus armatus Gill, 1863 (Centropomus), valid
- Synechoglanis beadlei Gill, 1859, synonym
Genera described (9):
- Bramocharax Gill, 1877, valid
- Brevoortia Gill, 1861, valid
- Chaenomugil Gill, 1863, valid
- Dactyloscopus Gill, 1859, valid
- Dormitator Gill, 1861, valid
- Entosphenus Gill, 1862, valid
- Evorthodus Gill, 1859, valid
- Hyporhamphus Gill, 1859, valid
- Opisthonema Gill, 1861, valid
Publications (15):
- Gill, Theodore Nicholas. 1859. "Description of a new genus of Pimelodinae from Canada". Annals of the Lyceum of Natural History of New York. 7(1-3):39-42 (ffm00245)
- Gill, Theodore Nicholas. 1859. "Description of a type of gobioids intermediate between Solinae and Tridentigerinae". Proceedings of the Academy of Natural Sciences of Philadelphia. 11:195-196 (ffm00421)
- Gill, Theodore Nicholas. 1859. "Description of Hyporhamphus, a new genus of fishes allied to Hemirhamphus, Cuv". Proceedings of the Academy of Natural Sciences of Philadelphia. (11):131 (ffm00537)
- Gill, Theodore Nicholas. 1859. "Notes on a collection of Japanese fishes, made by Dr. J. Morrow". Proceedings of the Academy of Natural Sciences of Philadelphia. 11:144-150 (ffm00850)
- Gill, Theodore Nicholas. 1859. "On Dactyloscopus and Leptoscopus, two new genera of the family of Uranoscopidae". Proceedings of the Academy of Natural Sciences of Philadelphia. 11:132-133 (ffm00382)
- Gill, Theodore Nicholas. 1861. "Catalogue of the fishes of the eastern coast of North America, from Greenland to Georgia". Proceedings of the Academy of Natural Sciences of Philadelphia. 13:1-63 (ffm00391)
- Gill, Theodore Nicholas. 1861. "Description of a new species of the genus Anableps of Gronovius". Proceedings of the Academy of Natural Sciences of Philadelphia. 13:3-6 (ffm00168) (abstract)
- Gill, Theodore Nicholas. 1861. "Descriptions of new species of Pimelodinae (abridged from the forthcoming report of Captain J. H. Simpson)". Proceedings of the Boston Society of Natural History. 8:42-46 (ffm00233)
- Gill, Theodore Nicholas. 1861. "On several new generic types of fishes contained in the museum of the Smithsonian Institution". Proceedings of the Academy of Natural Sciences of Philadelphia. 13:77-78 (ffm00856)
- Gill, Theodore Nicholas. 1861. "Synopsis of the subfamily of Clupeinae, with descriptions of new genera". Proceedings of the Academy of Natural Sciences of Philadelphia. 13:33-38 (ffm00349)
- Gill, Theodore Nicholas. 1863. "Descriptive enumeration of a collection of fishes from the western coast of Central America, presented to the Smithsonian Institution by Captain John M. Dow". Proceedings of the Academy of Natural Sciences of Philadelphia. 15:162-174 (ffm00290)
- Gill, Theodore Nicholas. 1877. "Synopsis of the fishes of Lake Nicaragua". Proceedings of the Academy of Natural Sciences of Philadelphia. 29:175-191 (ffm00221)
- Gill, Theodore Nicholas. 1882. "Bibliography of the fishes of the pacific coast of the United States to the end of the year 1879". Bulletin of the United States National Museum. (11):1-73 (ffm00839)
- Gill, Theodore Nicholas. 1885. "Sub-class II. Teleostei". The standard natural history. Vol. III. Lower vertebrates. 98-298 (ffm00858)
- Gill, Theodore Nicholas. 1893. "Families and Subfamilies of Fishes". Memoirs of the National Academy of Sciences. 6:127-138 (ffm01136)