. Bulletin of the British Ornithologists' Club. Birds. P. Alstrom et al. 55 Bull. 1995 115(1). Figure 1. From left to right: Phylloscopus reguloides fokiensis (AMXH No. 450258, type specimen), P. ricketti goodsoni (AMNH No. 450283), P. ricketti goodsoni (AMNH No. 450282, type specimen) and two individuals of P. r. ricketti. (Photo: Per Alstrom). P. hainanus and P. davisoni in that there is no emargination on P4. Judging from the available measurements of males (Table 1), goodsoni is slightly smaller than P. reguloides. However, the wide range in wing-length of the three specimens of goo
. Bulletin of the British Ornithologists' Club. Birds. P. Alstrom et al. 55 Bull. 1995 115(1). Figure 1. From left to right: Phylloscopus reguloides fokiensis (AMXH No. 450258, type specimen), P. ricketti goodsoni (AMNH No. 450283), P. ricketti goodsoni (AMNH No. 450282, type specimen) and two individuals of P. r. ricketti. (Photo: Per Alstrom). P. hainanus and P. davisoni in that there is no emargination on P4. Judging from the available measurements of males (Table 1), goodsoni is slightly smaller than P. reguloides. However, the wide range in wing-length of the three specimens of goodsoni suggests that the smallest one may be wrongly sexed, in which case the measurements may be even more similar to P. reguloides. Compared to P. ricketti, both the average wing- and tail-length of goodsoni are larger, a difference that would be further enhanced if the smallest goodsoni is a female. On the other hand, the average bill-length of ricketti exceeds that of goodsoni (Table 2). In all races of P. davisoni, the wing-lengths are on average shorter than in goodsoni. P. davisoni further differs from goodsoni by its (on average) shorter bill (Table 2). Discussion It is difficult to decide the taxonomic position of goodsoni on the basis of a sample of only three specimens. The specimens are, however, distinctive enough to warrant such an attempt. They differ significantly and consistently from all other taxa, and as all three specimens come from the same geographical area, goodsoni should be retained as a distinct taxon. However, we do not agree with earlier authors that it should be treated as a subspecies of P. ricketti. Hartert considered the species to stand between P. ricketti and P. trochiloides (reference to P. trochiloides in this context certainly refers to P. reguloides, which in those days was included in P. trochiloides). In our opinion, the pattern of the crown shows that goodsoni is more closely related to P. reguloides and P. davisoni than to P. ricketti.
Size: 1919px × 1303px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectbirds, bookyear1893
