Neotropical Birds
Version  1.0
This is a historic version of this account.   Current version

Castelnau's Antshrike Thamnophilus cryptoleucus

Thomas S. Schulenberg and Gary H. Rosenberg
Version: 1.0 — Published April 27, 2012


Distribution in the Americas

Castelnau's Antshrike is resident along the Amazon River and its major, upstream tributaries in western Amazonia. It occurs west along the Río Marañón in Peru to the mouth of the lower Río Santiango (Brooks et al. 2009); it is not known from the Río Pastaza in Peru (a region that is poorly explored ornithologically), but presumably occurs there, as in found on Pastaza in immediately adjacent Ecuador (Ridgely and Greenfield 2001a). Distribution in Peru and border regions of Castelnau's Antshrike. Solid circles: specimen records; open circles; sight records; dotted line: 1000 m contour (Schulenberg et al. 2006) The species ascends the Río Ucayali in Peru, apparently as far south as the mouth of the Río Urubamba (Zimmer 1933), and up the Río Napo of Peru and Ecuador (Rosenberg 1990, Ridgely and Greenfield 2001a). Castelnau's Antshrike in Colombia is known only from along the Amazon (Hilty and Brown 1986). The species occurs east along the Amazon in Brazil to near the mouth of the Rio Negro (Todd 1927).

Distribution outside the Americas

Endemic to the Americas.


Primarily found on river islands in the Amazon and large Amazonian tributaries. In Peru, occurs in the midstory of taller forest on larger, more established islands, as well as in dense forest with an understory of Heliconia on older islands (Rosenberg 1990, Zimmer and Isler 2003). Rosenberg (1990) considered Castelnau's Antshrike to be an obligate specialist on river islands, but it occurs locally on the "mainland" as well (Zimmer and Isler 2003, Armacost 2004, Brooks et al. 2009, Armacost 2012). On the mainland along the Amazon in northeastern Peru, Armacost (2012) found that Castelnau's Antshrike preferred forest and chacras ("small clearings made by subsistence farmers for homes, garden plots, and small ... farm fields"), but that on the mainland "it used habitats in proportion to availability" (Armacost 2012).

Historical changes

None reported.

Fossil history

None reported.

Distribution of the Castelnau's Antshrike - Range Map
  • Year-round
  • Migration
  • Breeding
  • Non-Breeding
Distribution of the Castelnau's Antshrike

Recommended Citation

Schulenberg, T. S. and G. H. Rosenberg (2012). Castelnau's Antshrike (Thamnophilus cryptoleucus), version 1.0. In Neotropical Birds Online (T. S. Schulenberg, Editor). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/nb.casant1.01
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