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Theristicus melanopis 1 Frank Vassen.jpg
Black-faced ibis.
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Pelecaniformes
Family: Threskiornithidae
Genus: Theristicus
Wagler, 1832
Type species
Geronticus melanopis
(Gmelin, 1789)[1]

Theristicus is a genus of birds in the family Threskiornithidae. They are found in open, grassy habitats in South America. All have a long, decurved dark bill, relatively short reddish legs that do not extend beyond the tail in flight (unlike e.g. Eudocimus and Plegadis), and at least the back is grey.


The genus Theristicus was erected by the German naturalist Johann Georg Wagler in 1832 with the black-faced ibis (Theristicus melanopis) as the type species.[2][3] The name is from the Ancient Greek theristikos meaning "of reaping".[4]

Formerly, T. caudatus included T. melanopis as a subspecies, but today all major authorities accept the split.

Image Scientific name Common Name Distribution
BANDURRIA MORA Harpiprioncaerulescens.jpg Theristicus caerulescens Plumbeous ibis south-western Brazil, especially in southern Mato Grosso and Rio Grande do Sul; Paraguay, especially in the Chaco and in the Paraguayan section of the Parana Basin; Uruguay; north-eastern Argentina and northern and eastern Bolivia
Buff-necked ibis (Theristicus caudatus).JPG Theristicus caudatus Buff-necked ibis northern and central South America in Colombia, Venezuela, the Guianas and Brazil
Wildlife in and around Reserva Laguna Nimez in El Calafate, Argentina - there is some uncertainty here amongst some authorities- is this the Black Faced Ibis (Theristicus melanops) - OR - the (24560030193).jpg Theristicus melanopis Black-faced ibis central Argentina and Chile
Andean Ibis (Theristicus branickii) (4857015246).jpg Theristicus branickii Andean ibis western South America


  1. ^ G.R. Gray (1849). The genera of birds : comprising their generic characters, a notice of the habits of each genus, and an extensive list of species referred to their several genera. 3. Longman, Brown, Green, and Longmans. p. 566.
  2. ^ Wagler, Johann Georg (1832). "Neue Sippen und Gattungen der Säugthiere und Vögel". Isis von Oken (in German and Latin). cols 1218–1235 [1231].
  3. ^ Mayr, Ernst; Cottrell, G. William, eds. (1979). Check-list of Birds of the World. Volume 1 (2nd ed.). Cambridge, Massachusetts: Museum of Comparative Zoology. p. 258.
  4. ^ Jobling, James A. (2010). The Helm Dictionary of Scientific Bird Names. London: Christopher Helm. p. 384. ISBN 978-1-4081-2501-4.
  • Matheu, E., & J. del Hoyo (1992). Family Threskiornithidae (Ibises and Spoonbills). pp. 472–506 in: del Hoyo, J., A. Elliott, & J. Sargatal (editors). Handbook of the Birds of the World. Vol. 1. Ostrich to Ducks. Lynx Edicions, Barcelona. ISBN 84-87334-10-5