SPECIES

Ruvu Weaver Ploceus holoxanthus Scientific name definitions

H. Dieter Oschadleus
Version: 1.0 — Published October 25, 2022

Plumages, Molts, and Structure

Plumages

Juvenile

The Juvenile plumage has not been described.

Definitive Basic

Female has forehead, crown, and back of neck yellowish-brown; a yellowish-white eyebrow; back pale brown with dark centers to the feathers of the mantle; underparts white washed with pale yellow on the crop, cheeks, and sides of neck; whitish plumage shaded with olive on the ear-coverts and with isabelline on the flanks and under tail-coverts. Upper tail-coverts and tail yellowish-brown, with the feathers of the latter with yellow edges; wings blackish brown with pale yellowish edges to the feathers and the least coverts yellowish brown; quills with broad bright pale yellow inner edges; under wing-coverts buff, slightly washed with yellow (4).

Male not described.

Definitive Alternate

Female probably similar to Definitive Basic.

Male has bright yellow body; the back is yellow with a tinge of olive-green. The forehead, crown, face and throat are chestnut orange. The primaries are bright yellow with an olive shade on the outer webs; the secondaries are bright yellow, with a slightly darker shade on the outer web. The feather shafts of the wing feathers are light yellow. The tail is yellow (3).

Molts

Molt has not been described, but is likely to follow the general pattern of molt in weavers which generally have a complete post-juvenile molt (5). Ruvu Weaver males may retain their bright yellow plumage all year as is the case for some closely related weavers restricted to equatorial regions, such as the Golden Palm Weaver (Ploceus bojeri). Alternatively, males may have two seasonal plumage changes, with an eclipse plumage resembling the females, as occurs in the closely related Southern Brown-throated Weaver (Ploceus xanthopterus) (6).

Bare Parts

Iris

Dark brown in both males and females (3).

Bill

Black in male (3), and in females, the maxilla is dark brown and the mandible is horn-colored (4).

Tarsi and Feet

Overall pale pinkish in both sexes; described as pale by Hartlaub (3).

Measurements

Overall length 12 cm (3).

The only known measurements are of two specimens. Measurements for the holotype, an adult male, were: wing length 70 mm, tail length 42 mm, bill length 14 mm, tarsus length 21 mm, length 124 mm (3). Wing length of a female specimen was about 60 mm (2.35 inches) (4).

Recommended Citation

Oschadleus, H. D. (2022). Ruvu Weaver (Ploceus holoxanthus), version 1.0. In Birds of the World (S. M. Billerman and N. D. Sly, Editors). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.ruvwea1.01