Temporary Page


Julia Gulka and David P. Mindell
Click on an image to view larger version & data in a new window
Click on an image to view larger version & data in a new window
taxon links Phylogenetic position of group is uncertainPhylogenetic position of group is uncertain[down<--]Accipitridae Interpreting the tree
close box

This tree diagram shows the relationships between several groups of organisms.

The root of the current tree connects the organisms featured in this tree to their containing group and the rest of the Tree of Life. The basal branching point in the tree represents the ancestor of the other groups in the tree. This ancestor diversified over time into several descendent subgroups, which are represented as internal nodes and terminal taxa to the right.

example of a tree diagram

You can click on the root to travel down the Tree of Life all the way to the root of all Life, and you can click on the names of descendent subgroups to travel up the Tree of Life all the way to individual species.

For more information on ToL tree formatting, please see Interpreting the Tree or Classification. To learn more about phylogenetic trees, please visit our Phylogenetic Biology pages.

close box
Topology built based on the mitochondrial DNA analysis of Haring et al. (2007), which is largely consistent with the findings of Lerner and Mindell (2005), varying only in a reversal in the position of Nisaetus alboniger and N. nanus in relation to N. nipalensis.
Containing group: Accipitridae


Gamauf, A., Gjershaug, J.-O., Rfv, N., Kvalfy, K. and Haring, E. 2005. Species or subspecies? The dilemma of taxonomic ranking of some South-east Asian hawk-eagles (genus Spizaetus). Bird Conserv. Int. 15:99-117.

Haring, E. K. Kvaløy, J.-O. Gjershaug, N. Røv, and A. Gamauf. 2007. Convergent evolution and paraphyly of the hawk-eagles of the genus Spizaetus (Aves, Accipitridae) – phylogenetic analyses based on mitochondrial markers. Journal of Zoological Systematics and Evolutionary Research 45(4):353-365.

Helbig, A. J., A. Kocum, I. Seibold, M. J. Braun. 2005. A multi-gene phylogeny of aquiline eagles (Aves: Accipitriformes) reveals extensive paraphyly at the genus level. Molecular Phylogenetics and Evolution 35:147-164.

Lerner, H. R. and D. P. Mindell. 2005. Phylogeny of eagles, Old World vultures, and other Accipitridae based on nuclear and mitochondrial DNA. Molecular Phylogenetics and Evolution 37:327-346.

Title Illustrations
Click on an image to view larger version & data in a new window
Click on an image to view larger version & data in a new window
Scientific Name Nisaetus cirrhatus
Location Bandipur, India
Specimen Condition Live Specimen
Source Changeable Hawk Eagle
Source Collection Flickr
Image Use creative commons This media file is licensed under the Creative Commons Attribution-NonCommercial-NoDerivs License - Version 2.0.
Copyright © 2007 Gopal Nayar
About This Page

Middlebury College, Middlebury, Vermont, USA

David P. Mindell
California Academy of Sciences, San Francisco, California, USA

Correspondence regarding this page should be directed to Julia Gulka at and David P. Mindell at

Page: Tree of Life Nisaetus. Authored by Julia Gulka and David P. Mindell. The TEXT of this page is licensed under the Creative Commons Attribution-NonCommercial License - Version 3.0. Note that images and other media featured on this page are each governed by their own license, and they may or may not be available for reuse. Click on an image or a media link to access the media data window, which provides the relevant licensing information. For the general terms and conditions of ToL material reuse and redistribution, please see the Tree of Life Copyright Policies.

Citing this page:

Gulka, Julia and David P. Mindell. 2011. Nisaetus. Version 06 August 2011 (temporary). http://tolweb.org/Nisaetus/57858/2011.08.06 in The Tree of Life Web Project, http://tolweb.org/

edit this page
close box

This page is a Tree of Life Branch Page.

Each ToL branch page provides a synopsis of the characteristics of a group of organisms representing a branch of the Tree of Life. The major distinction between a branch and a leaf of the Tree of Life is that each branch can be further subdivided into descendent branches, that is, subgroups representing distinct genetic lineages.

For a more detailed explanation of the different ToL page types, have a look at the Structure of the Tree of Life page.

close box


Page Content

articles & notes



Explore Other Groups

random page

  go to the Tree of Life home page