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Histological structure of the long bones of penguins -
W Meister - The Anatomical Record, 1962 - doi.wiley.com
... suggests that pachyostosis is a temporary stage in the evolution of marine ... LITERATURE
CITED Fawcett, DW 1942 The amedullary bones of the Florida manatee. ...

The evolution of long bone microstructure and lifestyle in lissamphibians -
M Laurin, M Girondot, MM Loth - Paleobiology, 2004 - bioone.org
... changes tests showed a marginally significant correlation in the evolution of
compactness ... segregated the aquatic taxa with the most compact bones from all ...

Bone histology of the ichthyosaurs; comparative data and functional interpretation -
V de Buffrenil, JM Mazin - Paleobiology, 1990 - JSTOR
... This problem obvi- ously refers to morphometric data dealing with the evolution
of the ... The amedullary bones of the Florida manatee (Trichechus tatirostris ...

[CITATION] PLEISTOCENE OR POST-PLEISTOCENE MANATEES IN THE MISSISSIPPI AND OHIO RIVER VALLEYS
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[CITATION] SEXUAL AND ONTOGENETIC VARIATION IN THE PELVIC BONES OF DUGONG DUGON (SIRENIA)
DP Domning - Marine Mammal Science, 1991 - Blackwell Synergy
... as well as individual variation in these bones, so I ... be collected by those involved
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Evoked brain potentials demonstrate hearing in a manatee (Trichechus inunguis)
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(Trichechus manatus ... The evolution of acoustic mechanisms in odontocete cetaceans ...

The evolution of long bone microstructure and lifestyle in lissamphibians
C Reference, M Laurin, M Girondot, MM Loth - Paleobiology, 2004 - bioone.org
... changes tests showed a marginally significant correlation in the evolution of
compactness ... segregated the aquatic taxa with the most compact bones from all ...
-

… scans and 3D reconstructions of Florida manatee (Trichechus manatus latirostris) heads and ear bones -
ME Chapla, DP Nowacek, SA Rommel, VM Sadler - Hearing Research, 2007 - Elsevier
... obtained from salvaged Florida manatee carcasses necropsied at ... using FastCAD v7 software
(Evolution Computing, Tempe ... left sets of ear bones (ie, tympanoperiotic ...

WEDNESDAY, Aug. 30 (HealthDay News) -- Research on manatee bones has yielded new insights into evolution, Stanford University researchers report.

David Kingsley, a professor of developmental biology at Stanford's School of Medicine, weighed 114 pairs of manatee pelvic bones and found the average left pelvic bone was 10 percent larger than the right one.

The finding, combined with Kingsley's previous research, suggests that mutations in one gene, called PitX1, may be responsible for the evolution of leglessness in manatees and numerous others species around the world, such as whales, fish and snakes.

"It's striking that evolution might use the same mechanism over and over," Kingsley said in a prepared statement.

The study was published in this week's online issue of the Proceedings of the National Academy of Sciences.

Further research is needed to identify the precise DNA changes in PitX1 or other genes that led to these evolutionary changes, the researchers said.

More information

Arizona State University has more about human evolution.