Flatworms Are Oldest Living Ancestors To Those Of Us With Right And Left Sides, Reported In The 19 March Issue Of Science

e from this pre-Cambrian time. (Flatworms, several of which are parasites, are only distantly related to, and much simpler than, the familiar earthworms.)

"It may well be that the origin of bilateral organisms occurred a bit earlier on, [before the Cambrian explosion,] from simple animals whose fossils have not been recovered," said Bagu. "This may mean that we need to look more carefully at pre-Cambrian rocks or sediments to search for primitive bilateral animals."

Bagu and his colleagues, Iaki Ruiz-Trillo and Marta Riutort of the University of Barcelona and D. Timothy J. Littlewood and Elisabeth A. Herniou of the Natural History Museum in London, began their study with the intention of investigating a troublesome subgroup of flatworms that didn't fit neatly into its prescribed classification. The Acoela, as this subgroup is known, are unlike other flatworms for a number of reasons, particularly because they are unusually primitive. For example, other flatworms have digestive tracts of some sort, but the Acoela lack them altogether.

To determine whether the Acoela might not be better classified separately from the other flatworms, Bagu and his colleagues took a molecular approach. Molecular studies such as this investigate the evolutionary relationships among taxonomic groups, based on the assumption that mutations in a gene occur at a constant rate. Once researchers have determined the sequence of a particular gene, they can compare the gene in a variety of organisms. If the sequences are significantly different, that implies that the organisms are more distantly related. In other words, more time has passed since they diverged from their common ancestor.

The research team sequenced the Acoela's "18S rDNA" gene, which had already been sequenced in many other animals, including other types of flatworms. The scientists then compared this sequence in a variety of animals, using a software

Contact: Gabriel Paal
American Association for the Advancement of Science

Page: 1 2 3

Related biology news :

1. Oldest evidence for processing of wild cereals: starch grains from barley, wheat, on grinding stone
2. Oldest known evidence of cat taming found in Cyprus, researchers report in Science
3. Oldest-known arm bone found in Pennsylvania
4. Oldest crystal reveals early Earth
5. Earlier water on Earth? Oldest rock suggests hospitable young planet
6. Oldest Ice Core From The Tropics Recovered, New Ice Age Evidence
7. Chinese And US Scientists Identify The Worlds Oldest Flowering Plant
8. Worlds Oldest Known Fossil Reptile Nests Discovered In Arizonas Petrified Forest
9. American Museum Of Natural History Researchers Announce Discovery Of Oldest Known Fossil Ants - 92-Million-Year-Old Fossils Found In New Jersey Amber
10. Living at home helps young mothers stay in school
11. Virginia Tech professor Marjorie Grene is the first woman in The Library of Living Philosophers

Post Your Comments:

(Date:7/19/2019)... ... , ... VetStem Biopharma has long been a leader in veterinary ... of a two-year research collaboration with Calidi Biotherapeutics, VetStem has signed a worldwide license ... VetStem should be able to fast-track this cancer therapy for use in dogs due ...
(Date:7/17/2019)... ... 15, 2019 , ... RCH Solutions (RCH), a ... companies, announces the availability of new specialty advisory practice, a Public Cloud Managed ... emerging bio-pharma companies interested in achieving specific outcomes related to public Cloud adoption. ...
(Date:7/10/2019)... FRANCISCO (PRWEB) , ... July 10, 2019 , ... ... Intelligent Virtual Agents for sales and service organizations, today announced its role ... experience and streamline the operational efficiency of its franchisees. A key part of ...
Breaking Biology News(10 mins):
(Date:6/11/2019)... ... June 11, 2019 , ... A ... mesenchymal stem cells (MSC-EV) are able to incorporate into human CD34+ cells, modifying ... on mice, MSC-EVs also increased the cells’ ability to lodge into bone marrow. ...
(Date:5/31/2019)... , ... May 30, 2019 , ... ... thinking on Data Integrity on July 08-09, 2019 in Boston, MA. This peer ... and medical device organizations. , The training will kick off with a compendial ...
(Date:5/21/2019)... (PRWEB) , ... May 21, 2019 , ... ... in Berlin (VLB) today officially opened the inaugural Africa Brewing Conference dedicated to ... malting industry in Africa. The event, which is supported through a partnership with ...
(Date:5/14/2019)... ... 14, 2019 , ... Gateway Genomics , a leading developer of prenatal ... to 5,000 square feet. , “This past year has seen exponential growth for ... CEO, Chris Jacob. “The SneakPeek At-Home test, which is mailed directly to our customers ...
Breaking Biology Technology:
Cached News: