Family Tanagers (Thraupidae)

Least Concern

Streaked Dacnis (Xenodacnis petersi)


Taxonomy

French: Xénodacnis de Peters German: Strichelkopfpitpit Spanish: Dacnis andino norteño
Taxonomy:

Xenodacnis petersi

J. Bond and Meyer de Schauensee

, 1939,

Yánac, Ancash, Peru

.

Hitherto treated as conspecific with X. parina, although given species rank when first described, with good reason: differs in its (in male) bright blue shaft streaks (present but less obvious on race bella) vs none (1); (in female) mid-crown to nape ashy brown vs dull blue (3); blue vs ferruginous on malar area at base of lower mandible (ns[1]); blue vs whitish subocular line (1); much larger size (five male wings comprising nominate 82.5, 79, 78 mm and bella 76.5, 75.5 vs two X. parina 66.5, 61.5#R; allow 3); moreover, commonest song type very different (lower speed and lower number of notes: 2+2=4)#R. Race bella marginally smaller and duller. Names petersi and bella described simultaneously, but latter as a race of former, so petersi claims priority. Two subspecies recognized (but see below).

What do (1) and (2) mean? Learn more about the scoring system.
Subspecies and Distribution
  • X. p. bella J. Bond & Meyer de Schauensee, 1939 – NC Peru (S Amazonas and La Libertad N of R Marañón).
  • X. p. petersi J. Bond & Meyer de Schauensee, 1939 – C Peru on W slope of Andes in Ancash, Huánuco (W of R Marañón) and Lima.
  • Also, race uncertain, SC Ecuador (mainly in Cajas National Park#R); sightings and specimens originally believed probably referable to bella, but recent dissertation#R considers the population involved to be taxonomically distinct (and relatively distinctive, the birds being larger and notably heavy); name not yet validly introduced.

    Descriptive notes

    14–15 cm, male 15·4–21 g, female 11·5–20 g (races combined). Small, with short, thin bill. Adult male is essentially all dark blue, usually with indistinct thin silvery... read more

    Voice

    Adult male song (Ecuador) is a short series of liquid whistles (5–9 notes in two phrases), usually... read more

    Habitat

    At or above treeline in stunted woodland, often in Polylepis groves where mixed with ... read more

    Food and feeding

    Tiny arthropods, including aphids (Aphidoidea) and sweet nectar-like secretions, both liquid or crystalline, deposited on leaves by aphids... read more

    Breeding

    Not well known. Apparently territorial, at least when breeding, defending linear space of c. 100 m. In Peru, juveniles observed in various... read more

    Movements

    Resident. Concentrates locally in high numbers, but no long-distance or significant elevational... read more

    Status and conservation

    Not globally threatened (Least Concern). Fairly common very locally in both Ecuador (discovered as recently as 1978) and Peru (where sometimes abundant in Ancash, e.g. in... read more

    Recommended citation

    del Hoyo, J., Collar, N. & Kirwan, G.M. (2019). Streaked Dacnis (Xenodacnis petersi). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from https://www.hbw.com/node/1344189 on 14 December 2019).