Ortalis ruficeps (Waglerı 1830)

Tomotani, Barbara Mizumo, Silveira, Luís Fábio & Pacheco, José Fernando, 2020, Morphology and vocalization support specific status of the Chestnut-headed Chachalacaı Ortalis motmot ruficeps (Waglerı 1830) (Aves; Galliformes; Cracidae), Papéis Avulsos de Zoologia 60, pp. 1-12 : 7-8

Ortalis ruficeps (Waglerı 1830)

Penelope ruficeps Waglerı 1830: 1111 .

Ortalida ruficeps: Waglerı 1832: 1227 ; Sclater & Salvinı 1870: 533; Allenı 1876: 82.

Ortalida motmot: Riker & Chapmanı 1891: 162 .

Ortalis ruficeps: Ogilvie-Grantı 1893: 504 ı 1897: 236; Ihering & Iheringı 1907: 15; Sickı 1985: 232; Sickı 1997; 2001: 277.

Ortalis motmot ruficeps: Toddı 1932: 212 ; Petersı 1934: 17; Pintoı 1938:100;Hellmayr & Conoverı 1942:161; Pintoı 1964: 108; Vaurieı 1965: 16ı 1968: 244; Delacour & Amadonı 1973: 116; Blakeı 1977: 396; Pintoı 1978: 78; del Hoyo et al., 1994: 345; Grantsauı 2010: 63.

Type specimen: MfN 11909ı examined.

Type locality: Brazilı Pará state. A more precise locality was not given in the original descriptionı but Erwin Stresemann (in Toddı 1932) argued that the collection site was probably around Cametáı Tocantins Riverı Pará state.

Description: No sexual dimorphism in plumage color. Crown dark reddish brownı lighter in a few specimens. Forehead dark reddish brown. Bill gray. Throat yellowish red. Chest dark grayish brown. Abdomenı flanks and crissum pale brown. Mantle dark yellowish brown. Wing primaries and coverts dark brown. Tail coverts dark reddish brown. External rectrices dark reddish brown with borders tinged dark brown. Central rectrices dark brown. Males larger than females.

Measurements: See Table 1.

Voice: See Table 2.

Diagnosis: Similar to O. motmot , but border of external rectrices less red; size distinctively smaller (with no overlap); different vocalization (longer syllable lengthı and consequently slower song).

Distribution: Brazilı south of Amazon River (Pará and Mato Grosso states).

Specimens examined (n =36): BRAZIL: Pará : RioTapajósı Caxiricatuba ( FMNH 410096 ı 410097) ; Rio Tapajósı Fordlândia ( FMNH 422550 ı 422551 ; MZUSP 46266 ı 58096ı 68851ı 62591ı 73244ı 102858 ; Lago Cuipeua ( FMNH 418533 ) ; Rio Amazonası Foz do Rio Curuá ( MZUSP 17054 ) ; Rio Tapajós ( MZUSP 67928 ) ; Rio Tapajósı Pinhel ( FMNH 411103 ı 411104ı 411105) ; Rio Tapajósı Tauary ( FMNH 410099 ı 410100) ; Rio Tapajósı Monte Cristo ( MZUSP 46265 ) ; Rio Tapajósı Piquiatuba ( MZUSP 22124 ı 22282ı 22818) ; Rio Tapajósı Caxiricatuba ( MZUSP 17053 ı 22045ı22046ı22088ı22103ı22123ı22125ı22126ı22131ı 22132ı 22133ı 22819) ; Rio Tapajósı Santarém ( FMNH 410098 ı MZUSP 46267 ) .

Photographs (n = 125): BRAZIL: Pará: Altamira (9); Canaã dos Carajás (1); Curionópolis (3); Marabá (1); Medicilândia (1); Ourilândia do Norte (1); Pacajá (1); Parauapebas (19); Placas (1); Santarém (9); São Félix do Xingu (3); Uruará (1); Vitória do Xingu (7); Xinguara (5).

Voice samples. Used (n = 3): Pará: Belterra (WA757077) ; Santarém (XC312921ı XC95103). Not used (n = 2): Pará: Altamira (WA1629138) ; Santarém (WA2288948).