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Spot-winged Falconet
Spiziapteryx circumcincta

Status: Lower risk

Population Trend: Unknown.

Other Names: Halcon Gris.


Spiziapteryx circumcincta
click to enlarge
Distribution: Neotropical. Eastern BOLIVIA (Santa Cruz) to northern and central ARGENTINA (south to Rio Negro), PARAGUAY, and URUGUAY. more....

Subspecies: Monotypic.

Taxonomy: The taxonomic relationships of this form require further study. Based on osteological evidence, Olson (1976) argued that this monotypic genus is most closely related to the other genera (Caracara, Herpetotheres, Micrastur) of falconids endemic to the Neotropics and not to the African Pygmy Falcon (Polihierax), where it had been placed by previous authors. Based on 24 morphometric characters, Kemp and Crowe (1994) found that it clustered with the genus Falco, but not with the Pygmy Falcon, Polihierax semitorquatus, or the five species of Microhierax. On the basis of syringeal morphology, Griffiths (1994) concluded that Spiziapteryx is most closely related to Falco and the falconets of the Old World, rather than to the caracaras. The phylogeny inferred from differentially weighted cytochrome-b sequences showed Spiziapteryx to be most closely related to the Falco clade, which is derived directly from the caracaras (Griffiths 1997), and her later genetic studies (Griffiths 1999, Griffiths et al. 2004) indicated that it is closest to Caracara. Because the generic name Spiziapteryx is feminine, David and Gosselin (2002) recommended that the species name should be changed from "circumcinctus" to circumcincta.

Movements: Probably non-migratory.

Habitat and Habits: Lowlands. Inhabits savannas and dry forests, especially mesquites.

Food and Feeding Behavior: Probably omnivorous, eating a variety of insects, lizards, and birds (Bechard et al. 2004).

Breeding: Usually nests in occupied and unoccupied nests of the Monk Parakeet, but also in old nests of ovenbirds (Pseudoseisura lophotes) (Dean 1971, Narosky et al. 1992).

Conservation: Apparently uncommon throughout its range. This poorly known species would be a good candidate for study by a graduate student. Categorized as a species of "Least Concern" by BirdLife International.

Important References: 
Bierregaard, R.O. 1994. Spot-winged Falconet. Pp. 254-255 in del Hoyo, J.,
  A. Elliott, and J. Sargatal (eds). Handbook of birds of the world. Vol. 2.
  New World vultures to guineafowl. Lynx Edicions, Barcelona, Spain.
Dean, A. 1971. [Nesting of the Spot-winged Falconet (Spiziapteryx
  circumcinctus
) in Pampa and Rio Negro.] Hornero 11:124.
Dean, A. 1971. Notes on Spiziapteryx circumcinctus. Ibis 113:101-102.
Ferguson-Lees, J., and D.A. Christie. 2001. Raptors of the world. Houghton
  Mifflin, Boston, MA.
Griffiths, C.S. 1994. Syringeal morphology and the phylogeny of the
  Falconidae. Condor 96:127-140.
Griffiths, C.S. 1999. Phylogeny of the Falconidae inferred from molecular
  and morphological data. Auk 116:116-130.
Kemp, A.C., and T.M. Crowe. 1994. Morphometrics of falconets and hunting
  behaviour of the Black-thighed Falconet Microhierax fringillarius. Ibis
  136:44-49.
Martella, M.B., and E.H. Bucher. 1984. Nesting of the Spot-winged Falconet
  in Monk Parakeet nests. Auk 101:614-615.
Narosky, T., M. Babarskas, and B.L. Lanus. 1992. [Information on a nest of
  Spot-winged Falconet (Spiziapteryx circumcinctus) in Buenos
  Aires.] Hornero 13:246-247.
Olson, S. 1976. The affinities of the falconid genus Spiziapteryx. Auk
  93:633-636.
Sarasola, J.H., J.J. Maceda, M.J. Bechard, and A.E. Lanusse. 2000.
  Morphometric measurements of the Spot-winged Falconet in central Argentina.
  P. 220 in R. Yosef, M.L. Miller, and D. Pepler (eds.), Raptors in the new
  millenium.
Straneck,R.J., and G. Vasina. 1982. Unusual behavior of the Spot-winged
  Falconet (Spiziapteryx circumcinctus). Raptor Research 16:25-26. more....

Sites of Interest:
Xeno-canto
Vocalizations.
Aves de Rapina do Brasil
Species account with emphasis on Brazil.

Researchers:
Alvarado Orellana, Sergio Alfredo
Bechard, Marc J.
Galmes, Maximiliano AdriŠn
Leveau, Lucas
Pereyra Lobos, Roberto
Rodriguez, Ramiro Ezequiel
Sarasola, Josť HernŠn

Last modified: 4/7/2010

Recommended Citation: Global Raptor Information Network. 2017. Species account: Spot-winged Falconet Spiziapteryx circumcincta. Downloaded from http://www.globalraptors.org on 24 Jun. 2017








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