Navigation Links
Getting a leg up on whale and dolphin evolution
Date:9/24/2009

ance, fossil evidence became an important way to determine the precise evolutionary steps that cetacean ancestors took. Traditionally, the origin of whales was linked to the mesonychids, an extinct group of carnivores that had singly-hoofed toes. The recent discovery of Indohyus, a clearly water-adapted herbivore, complicates this picture (as new fossils often do) because of ear bones similar to those of modern cetaceans, which are theorized to help the animal have heard better while under the water.

To tease apart different potential evolutionary histories (whether carnivory or water adaptations occurred first; the mesonychid or Indohyus relatedness ideas), Spaulding and colleagues mapped the evolutionary relationships among more than 80 living and fossil taxa (in other words, species and/or genera). These taxa were scored for 661 morphological and behavioral characters (such as presence of hair or the shape of and ankle bone). Forty-nine new DNA sequences from five nuclear genes were also added to the mix of more than 47,000 characters; both morphological and genetic data build on previous analyses by authors Maureen O'Leary of Stony Brook University and John Gatesy of University of California at Riverside. In addition, Indohyus, carnivores (dogs and cats), and an archaic group of meat-eating mammals called creodonts were included.

The team found that the least complex evolutionary tree places Indohyus and similar fossils close to whales, while mesonychids are more distantly related. Hippos remain the closest living relatives. These results suggest that cetacean ancestors transitioned to water before becoming carnivorous but that the meat-eating diet developed while these ancestors could still walk on land.

"How do you put flesh and movement onto a fossil?" asks author O'Leary. "The earliest stem whale probably ate prey in water while still being able to walk on land. Indohyus has some adaptations for
'/>"/>

Contact: Kristin Elise Phillips
kphillips@amnh.org
212-496-3419
American Museum of Natural History
Source:Eurekalert  

Page: 1 2 3

Related biology news :

1. Getting plants to rid themselves of pesticide residues
2. Getting to the root of science in a nutty way
3. Getting down to cancer basics
4. Getting into hot water
5. Many middle-aged and older Americans not getting adequate nutrition
6. Getting warmer? Prehistoric climate can help forecast future changes
7. Getting to the root of the matter
8. Getting better with a little help from our micro friends
9. Getting wise to the influenza virus tricks
10. The sea ice is getting thinner
11. New species discovered on whale skeletons
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Getting a leg up on whale and dolphin evolution
(Date:4/2/2015)... 2015 At its 2015 ACMG Annual Clinical ... , the American College of Medical Genetics and Genomics ... its Board.  Members of the ACMG Board of Directors ... and advancing its policies and programs. ACMG is the ... "It,s an eventful time in medical genetics and genomics.  ...
(Date:4/2/2015)... 2015 Fingerprint Cards (FPC) has ... from the distributor World Peace Industrial Group (WPI), part ... although the major part of the shipments will take ... by smartphone manufacturers in China . ... the communicated revenue guidance of + 1 000 MSEK for ...
(Date:4/1/2015)... Medisafe ™, the leading global medication management platform with ... Android smartphones and tablets, announces today that ... allow patients to track and correlate their adherence directly ... be able to visualize in real-time how taking medication ... glucose levels and blood pressure. "Patients need ...
Breaking Biology News(10 mins):American College of Medical Genetics and Genomics Announces New Board Members: Dr. Louanne Hudgins is ACMG President-Elect 2American College of Medical Genetics and Genomics Announces New Board Members: Dr. Louanne Hudgins is ACMG President-Elect 3American College of Medical Genetics and Genomics Announces New Board Members: Dr. Louanne Hudgins is ACMG President-Elect 4American College of Medical Genetics and Genomics Announces New Board Members: Dr. Louanne Hudgins is ACMG President-Elect 5American College of Medical Genetics and Genomics Announces New Board Members: Dr. Louanne Hudgins is ACMG President-Elect 6American College of Medical Genetics and Genomics Announces New Board Members: Dr. Louanne Hudgins is ACMG President-Elect 7American College of Medical Genetics and Genomics Announces New Board Members: Dr. Louanne Hudgins is ACMG President-Elect 8Fingerprint Cards Receives Touch Fingerprint Sensor Order of SEK 110 Million 2Medisafe Announces Launch of Biometric Integration, Enabling Patients to Stay Adherent to Their Meds and See Tangible Health Results 2
... at Buffalo has been shown to extend significantly the survival ... cancer's spread to the lungs in the animals by more ... particular disaccharide, an antigen known as TF-Ag, which aids the ... antibody did not kill the cancer cells, it blocked stages ...
... Researchers have uncovered physiological differences among female Glanville ... from their birth place and establish new colonies. ... more quickly compared to their less mobile female ... how genetic differences influence behavior and how the ...
... at the Stowers Institute for Medical Research, and Olivier ... the Howard Hughes Medical Institute, are the first and ... network of cyclic genes that shed light on the ... , The paper was published on Science Express, ...
Cached Biology News:Antibody extends life of mice with breast cancer 2Some butterflies travel farther, reproduce faster 2Some butterflies travel farther, reproduce faster 3
(Date:5/6/2015)... (PRWEB) May 06, 2015 Histogen, ... on the products of cells grown under simulated ... 105F immunomodulatory treatment candidate for melanoma during the ... taking place May 6-9, 2015 in Atlanta, GA. ... cells produce a soluble material with anti-oncologic properties, ...
(Date:5/5/2015)... /PRNewswire/ - Aptose Biosciences Inc. (NASDAQ: APTO, TSX: APS) ("Aptose" ... three months ended March 31, 2015 and provided a ... Canadian dollars. Effective July 17, 2014 ... 31 to December 31. As a result of that ... the three months ended March 31, 2015, while the ...
(Date:5/5/2015)... , May 05, 2015 Research ... has announced the addition of the ... to their offering. Macromolecules which ... undergo separation or are broken into smaller ... products. This separation requires various advanced systems ...
(Date:5/5/2015)... , May 5, 2015 Reprints Desk, Inc., ... providing on-demand access to scientific, technical and medical (STM) ... the Association of Southeastern Research Libraries (ASERL) . ... libraries located across 11 southeastern states. Founded in 1956, ... collaborative programs to address the continually changing needs of ...
Breaking Biology Technology:Novel Immunomodulatory Treatment Induces Apoptosis in Melanoma 2Aptose Biosciences Reports Results for the First Quarter Ended March 31, 2015 2Aptose Biosciences Reports Results for the First Quarter Ended March 31, 2015 3Aptose Biosciences Reports Results for the First Quarter Ended March 31, 2015 4Aptose Biosciences Reports Results for the First Quarter Ended March 31, 2015 5Aptose Biosciences Reports Results for the First Quarter Ended March 31, 2015 6Aptose Biosciences Reports Results for the First Quarter Ended March 31, 2015 7Aptose Biosciences Reports Results for the First Quarter Ended March 31, 2015 8Global Separation Systems Market in Biotechnology 2015-2019 - Trends and Forecasts for the $28 Billion Market 2Association of Southeastern Research Libraries Partners with Reprints Desk to Improve Access for Hard-to-Find Materials 2Association of Southeastern Research Libraries Partners with Reprints Desk to Improve Access for Hard-to-Find Materials 3Association of Southeastern Research Libraries Partners with Reprints Desk to Improve Access for Hard-to-Find Materials 4
... As previously announced on October 24th, 2009 delSECUR CORPORATION sold ... del-Id system to QTech Systems Inc. in an Asset Purchase ... time and as mentioned in the Press Release on June ... on the del-Id prototype development for commercialization. ...
... 4, 2011 Reportlinker.com announces that a ... its catalogue: Antiviral Therapeutics ... http://www.reportlinker.com/p0203535/Antiviral-Therapeutics---Technologies-markets-and-companies.html ... antiviral approaches including vaccines, pharmaceuticals and innovative ...
... Reportlinker.com announces that a new market research ... Nanobiotechnologies- applications, markets and companies ... is the creation and utilization of materials, devices, ... the nanometer-length scale (a nanometer is one billionth ...
Cached Biology Technology:delSECUR CORPORATION Announces Its Dissolution; and the Distribution of Its Asset to Its Lenders and Shareholders of the Corporation 2Reportlinker Adds Antiviral Therapeutics - Technologies, Markets and Companies 2Reportlinker Adds Antiviral Therapeutics - Technologies, Markets and Companies 3Reportlinker Adds Antiviral Therapeutics - Technologies, Markets and Companies 4Reportlinker Adds Nanobiotechnologies - Applications, Markets and Companies 2Reportlinker Adds Nanobiotechnologies - Applications, Markets and Companies 3
AdestaTM Tissue/Cell Preservation Medium Sterile / Non-sterile: Sterility Tested Endotoxin: ...
...
... Immunogen: Synthetic peptide derived from the C-terminal ... growth factor D iris-expressed growth factor spinal ... mouse and rat by one amino acid ... kDa human mouse and rat PDGF-D proteins. ...
...
Biology Products: