Sidney Irving Smith (February 18, 1843, in Norway, Maine – May 6, 1926, in New Haven, Connecticut) was an American zoologist.

Private life Sidney Smith was the son of Elliot Smith and Lavinia Barton. His brother in law was Addison Emery Verrill. Smith married Eugenia Pocahontas Barber in New Haven, Connecticut, on June 29, 1882. The couple had no children, and Eugenia died on March 14, 1916. Smith suffered from hereditary glaucoma, rendering him partially sighted from 1906, and completely blind some years before his death. He died on May 6, 1926, of throat cancer.

Education and career In his youth, Sidney Irving Smith became expert on the fauna around his home town, and an expert at making collections, particularly of insects. He studied at the Sheffield Scientific School of Yale University, and received his Ph.B. in 1867. Yale University conferred upon him the honorary degree of M.A. in 1887. He stayed on at Yale, initially as an assistant, but from 1875 as the first professor of comparative anatomy, a post he retained until his retirement in 1906. Thereafter, Smith remained at Yale as professor emeritus.

Having begun as an entomologist (being State Entomologist of Maine and Connecticut for a number of years), Smith changed relatively early in his career to the study of crustaceans, probably because of his work with the United States Fish Commission. He participated in many field excursions, sometimes in collaboration with Verrill or with Louis Agassiz. Smith was the chief zoologist during the dredging of Lake Superior carried out by the United States Lake Survey in 1871, and the dredging in the region of St. George's Banks in 1872 carried out by the United States Coast Survey. In 1884, Smith was elected to the National Academy of Sciences.

Legacy Smith produced more than 70 original papers. His collections are now housed in the Peabody Museum of Natural History at Yale and at the National Museum of Natural History.

Sidney Irving Smith was honoured in the specific epithets of a number of species. They include Lembos smithi Holmes, 1905, Metapenaeopsis smithi (Schmitt, 1924), Oxyurostylis smithi Calman, 1912, Pandarus smithi Rathbun, 1886 and Siphonoecetes smithianus Rathbun, 1908.

Taxa named by Sidney Irving Smith include:

Callinectes danae S. I. Smith, 1869 Cardisoma crassum S. I. Smith, 1870 Eumunida S. I. Smith, 1883 Eumunida picta S. I. Smith, 1883 Eunephrops S. I. Smith, 1885 Eunephrops bairdii S. I. Smith, 1885 Hepatella Smith in Verrill, 1869 Hyalella S. I. Smith, 1874 Macrobrachium ohione S. I. Smith, 1874 Neomysis americana (S. I. Smith, 1873) Orchestia agilis S. I. Smith, 1874 Parapaguridae S. I. Smith, 1882 Polycheles sculptus S. I. Smith, 1880 Uca pugnax (S. I. Smith, 1870) Xiphopenaeus hartii Smith, 1869 Acanthephyra brevirostris S. I. Smith, 1885 Admete nodosa Verrill & Smith, 1885 Ampithoe longimana S. I. Smith, 1873 Ampithoe valida S. I. Smith, 1873 Arctus americanus S. I. Smith, 1869 Argulus laticauda S. I. Smith, 1873 Argulus latus S. I. Smith, 1873 Argulus megalops S. I. Smith, 1873 Benthonectes filipes S. I. Smith, 1885 Benthonectes S. I. Smith, 1885 Beringius brychius (Verrill & Smith, 1885) Byblis serrata S. I. Smith, 1873 Bythocaris gracilis S. I. Smith, 1885 Bythocaris nana S. I. Smith, 1885 Colletes perforator Smith, 1869 Cymadusa compta (S. I. Smith, 1873) Dyspanopeus sayi (S. I. Smith, 1869) Elasmopus laevis S. I. Smith, 1873 Elasmopus levis (S. I. Smith, 1873) Ephyrina benedicti S. I. Smith, 1885 Ephyrina S. I. Smith, 1885 Eucratopsis Smith, 1869 Eurypanopeus depressus (S. I. Smith, 1869) Evibacus Smith, 1869 Evibacus princeps Smith, 1869 Gammarus annulatus S. I. Smith, 1873 Hadropenaeus modestus (S. I. Smith, 1885) Haliporus modestus (S. I. Smith, 1885) Haliporus robustus (S. I. Smith, 1885) Heterogenys microphthalma (S. I. Smith, 1885) Heteromysis formosa S. I. Smith, 1873 Heteromysis S. I. Smith, 1873 Hippolyte zostericola (S. I. Smith, 1873) Hyalopecten undatus (A. E. Verrill & S. Smith, 1885) Hymenopenaeus modestus S. I. Smith, 1885 Hymenopenaeus robustus S. I. Smith, 1885 Melita nitida S. I. Smith, 1873 Metapenaeopsis goodei (S. I. Smith, 1885) Metapenaeus goodei (S. I. Smith, 1885) Munidopsis crassa S. I. Smith, 1885 Munidopsis similis S. I. Smith, 1885 Mysis stenolepis S. I. Smith, 1873 Neopanope sayi (S. I. Smith, 1869) Neopanope texana sayi (S. I. Smith, 1869) Palaemon ensiculus Smith, 1869 Panopeus hartii S. I. Smith, 1869 Panopeus harttii S. I. Smith, 1869 Panopeus obesus S. I. Smith, 1869 Panopeus sayi S. I. Smith, 1869 Panulirus echinatus Smith, 1869 Parapenaeus goodei S. I. Smith, 1885 Parapenaeus megalops Smith, 1885 Parapenaeus S. I. Smith, 1885 Penaeopsis goodei (S. I. Smith, 1885) Penaeopsis megalops (Smith, 1885) Pleoticus robustus (S. I. Smith, 1885) Pontonia margarita Smith, 1869 Rimapenaeus similis (S. I. Smith, 1885) Scyllarus americanus (S. I. Smith, 1869) Scyphacella arenicola S. I. Smith, 1873 Scyphacella S. I. Smith, 1873 Thyasira grandis Verrill & Smith, 1885 Thyasira plicata Verrill & Smith, 1885 Trachypenaeus similis (S. I. Smith, 1885) Xiphopenaeus Smith, 1869

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