Zimmerius acer

The Guianan Tyrannulet is a species of bird in the Tyrannidae family, the tyrant flycatchers. It is found in forests in the east Amazon Basin and north-eastern Brazil. Until recently, it was considered a subspecies of the Slender-footed Tyrannulet.

The Zimmerius acer is classified as Least Concern. Does not qualify for a more at risk category. Widespread and abundant taxa are included in this category.

Zimmerius acer is split from Z.gracilipes ( Rheindt et al. 2008; SACC 2008) 12. Zimmerius albigularis is split from Z. chrysops (Rheindt et al. 2008; SACC 2008) 13. Zimmerius flavidifrons is split from Z. chrysops (Ridgely & Greenfield 2001, Fitzpatrick 2004); under discussion by SACC, see Proposal 363 14. More

Zimmerius acer was treated as a separate species from Zimmerius gracilipes by Cory & Hellmayr (1927), but Zimmer (1941) treated them as conspecific; Pinto (1944), however, treated them as separate species and noted that both had been collected at Santarem, Brazil (Gyldenstolpe 19## REF - check). Most recent classifications (e.g., Sibley & Monroe 1990, Ridgely & Tudor 1994, Dickinson 2003, Fitzpatrick 2004) have followed Zimmer (1941) in treating them as conspecific. Rheindt et al. More

the Guianan taxon Zimmerius acer has essentially always been treated as one of three subspecies, within Zimmerius gracilipes, along with the nominate subspecies of western Amazonia and gilvus of southern Amazonia. Ridgely and Tudor (1994), while not questioning the taxonomy of Zimmerius gracilipes, noted significant vocal variation in the species. Hilty (2003), citing Mark Robbins, indicated that birds in the highlands of Guyana are different from birds in the lowlands. . Analysis and new information: Rheindt et al. More

Zimmerius acer, in Suriname = Each small square indicates a day with the observation of at least 1 (group) of these birds, the medium ones at least 4 days of observations and the largest ones 10 or more days. The color of each square indicates: blue for coastal area, yellow for savanna and red for rainforest. More