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Sharp-tailed sandpiper
The sharp-tailed sandpiper (''Calidris acuminata'') (but see below) is a small wader.
== Taxonomy ==
More recently, a review of new data has indicated that this bird should perhaps better be placed into the genus ''Philomachus''
– as ''P. acuminatus'' – which now contains only the ruff but if the sharp-tailed sandpiper is merged into it would need to accommodate the broad-billed sandpiper also (Thomas ''et al.'', 2004).
While the latter certainly is a most peculiar calidrid, the sharp-tailed sandpiper is much more similar to other ''Calidris''/''Erolia'' species such as the pectoral sandpiper. On the one hand, its larger size and long-legged stance, and the breast pattern which gradually fades away on the belly as in the ruff instead of having a fairly sharp border as in the ''Calidris''/''Erolia'' stints indicate that placement in ''Philomachus'' may be correct. Still, it is just as possible that – given the fairly common instances of hybridization in calidrines – mitochondrial DNA data has given a false picture of this species' true affinities. The curlew sandpiper, which is a proposed parent of the hybrid called "Cooper's sandpiper" (''"Calidris"'' × ''cooperi'') together with the sharp-tailed sandpiper, is another unusual calidrid that is hard to place systematically.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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