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Post by another specialist on Jun 6, 2005 15:09:56 GMT
Aidemedia zanclops
Olson & James 1991
Holocene of Oahu, Hawaiian Islands
Primary materials: Holotype: mandibula
Storrs L. Olson & Helen F. James,
Descriptions of thirty-two new species of birds from the Hawaiian Islands: Part II. Passeriformes
Ornithological Monographs 46 (1991)
The American Ornithologists' Union, Washington D.C.
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Post by Melanie on Jun 6, 2005 21:43:54 GMT
This is another newly described species which is part of the new Genus Aidemedia. The Aidemedia species are characterized as being Drepanidine birds with sturdy ,straight or decurved, very elongate bills, with extremely long retroarticular processes on the mandibles.
The bones of this new species were collected by Aki Sinoto and others from site 50-Oa-B6-78 at Barbers Point, Oahu.
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Post by another specialist on Jun 7, 2005 6:13:25 GMT
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Post by another specialist on Nov 8, 2005 8:07:49 GMT
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Post by another specialist on Nov 8, 2005 8:08:18 GMT
commonly called Sickle-billed Gaper
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Post by another specialist on Jul 22, 2006 10:26:31 GMT
Aidemedia zanclops, new species
(Figs. 29C, 30A)
"Sickle-billed gaper, Oahu" Olson and James, 1982b:41.
"Sickle-billed gaper" Olson and James, 1982b:45; James, 1987:225.
Holotype: Mandible lacking the posterior end of the right ramus, with the roedial
Figs. 29C, 30A). Collected July or August 1977 by Aki Sinoto and others. The
left posterior ramus had been separated from the rest of the bone probably while
still in the fossil site, and was originally assigned catalog number BBM-X 155177
before it was recognized and re-attached. BBM-X 155160 is the correct catalog
number for the entire specimen.
Type locality: Site 50-Oa-B6-78, Barbers Point, Oahu, Hawaiian Islands.
Distribution: Oahu: known so far only from the type locality, although fragmentary
fossils from Ulupau Head may represent the same species (James 1987).
Etymology: Greek, zanclon, a sickle, plus ops, face; from the long, decurved
mandible. The name is a masculine noun in apposition.
Measurements ofholotype: See Table 11.
Diagnosis: The mandible differs from other species of Aidemedia in being narrower
and more gracile, and in having a decurved rather than straight symphysis,
although the degree of curvature is slight compared to other sickle-billed drepanidines
(Drepanis, Vestiaria, and Hemignathus). In its elongation the mandible
resembles A. chascax more than A. lutetiae.
Remarks: With its narrow, decurved bill, this is certainly the most divergent
of the three species of Aidemedia, yet in being elongated the bill is rather unexpectedly
more similar to the syrupattic species A. chascax than to the evidently
allopatric A. lutetiae. Possibly the straight-billed (A. chascax) and curved-billed
(A. zanclops) forms of Aidemedia from Oahu are males and females of a single,
highly dimorphic species. Among passerines, a comparable extreme of sexual
dimorphism in bill shape is reached only by the Huia, Heteralocha acutirostris
(Callaeidae), of New Zealand, so that the possibility of this occurring in Aidemedia
must be considered slight, particularly since no such dimorphism appears to be
present in A. lutetiae of Molokai and Maui. |
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Post by another specialist on Jul 22, 2006 10:28:46 GMT
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Post by another specialist on Jul 22, 2006 10:29:03 GMT
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Post by another specialist on Jul 22, 2006 10:29:56 GMT
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