| variation of plumage patterns, geographic distribution and taxonomy of the unicolored blackbird (aves: icteridae). | the unicolored blackbird agelasticus cyanopus (vieillot, 1819) is a marsh bird with four allopatric subspecies restricted to lowlands in south america east of the andes. i conducted a taxonomic revision of the species based on analysis of external morphological characters of 288 study skins, including all types available. my revision shows that: 1) leistes unicolor swainson, 1838, is a senior synonym of a. c. xenicus (parkes, 1966) and, therefore, the correct name of the taxon should be a. c. un ... | 2017 | 28187649 |