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Topic: Thalassornis leuconotus

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Thalassornis

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	White-backed Duck - Wikipedia, the free encyclopedia (Site not responding. Last check: 2007-11-03)
		The White-backed Duck (Thalassornis leuconotus) is a waterbird of the family Anatidae.
		It is the only member of the genus Thalassornis, (Eyton, 1838).
		There are two subspecies, Thalassornis leuconotus leuconotus and Thalassornis leuconotus insularis.
	en.wikipedia.org /wiki/Thalassornis (218 words)

	THE OSTEOLOGY AND TAXONOMIC POSITION OF THE WHITE-BACKED DUCK, THALASSORNIS LEUCONOTUS
		Thalassornis resembles Dendrocygna in the form of the pubis, but otherwise is convergent to Biziura, especially in its relative proportions, which indicate a greater degree of adaptation for diving than in Dendrocygna.
		The lower jaw of Thalassornis resembles that of Dendrocygna because the posterior edge of the retroarticular process is straight, while in the Oxyurini (except Biziura) it is rounded.
		Since Thalassornis is the only known member of the Anserinae which has become highly specialized fo.r diving, it is possible that more such types failed to develop because this adaptive zone was being actively entered by several groups of true ducks (Anatinae), which were perhaps better fitted to exploit this way of life.
	elibrary.unm.edu /sora/Wilson/v083n03/p0270-p0277.html (3539 words)

	Numts: A Challenge for Avian Systematics and Population Biology
		That the se- quence codes for nine amino-acid substitutions rel- ative to other Dendrocygna, strongly suggests that it is no longer evolving under the same selective con- straints and supports the conclusion that it is a Numt.
		arborea 12.3 14.7 Thalassornis leuconotus 16.1 17.0 in sequencing over half of the mitochondrial genome of this species.
		We find this example significant because we ini- tially obtained a single unambiguous sequence with DNA extracted from muscle tissue, presumably with a ratio of mitochondrial to nuclear genome copies of 1,000s to 1 (Robin and Wong 1988).
	elibrary.unm.edu /sora/Auk/v115n01/p0214-p0221.html (7489 words)

	Madagascar Pochard (Aythya innotata) - BirdLife species factsheet
		From all waterfowl by overall dark plumage and white undertail-coverts and wing-bar extending length of the wing.
		In addition, from White-backed Duck Thalassornis leuconotus by uniform colouration, dark back and white eye (in male), from Red-knobbed Coot Fulica cristata by mostly dark bill, and from all other ducks by diving habit and running take-off.
		Range & population Aythya innotata is endemic to Madagascar, where it was found historically in the Lake Alaotra basin in the northern central plateau.
	www.birdlife.org /datazone/species?action=SpcHTMDetails.asp&sid=477&m=0 (811 words)

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