Navigation Links
Scientists discover the most primitive living eel
Date:8/17/2011

Scientists at the Smithsonian and partnering organizations have discovered a remarkably primitive eel in a fringing reef off the coast of the Republic of Palau. This fish exhibits many primitive anatomical features unknown in the other 19 families and more than 800 species of living eels, resulting in its classification as a new species belonging to a new genus and family. The team's research is published online in the Proceedings of the Royal Society B, Aug. 17.

Many of the physical features of this new genus and species of eel, Protoanguilla palau, reflect its relationship to the 19 families of Anguiliformes (true eels) currently living. Other, more primitive physical traits, such as a second upper jaw bone (premaxilla) and fewer than 90 vertebrae, have only been found in fossil forms from the Cretaceous period (140 million to 65 million years ago). Still other traits, such as a full set of bony toothed "rakers," in the gill arches are a common feature in most bony fishes, but lacking in both fossil and living eels. The team's analyses of total mitochondrial DNA indicate that P. palau represents an ancient, independent lineage with an evolutionary history comparable to that of the entire order of living and fossil eel species.

"The equivalent of this primitive eel, in fishes, has perhaps not been seen since the discovery of the coelacanth in the late 1930s," said Dave Johnson, ichthyologist at the Smithsonian's National Museum of Natural History and lead author of the team's research. "We believe that such a long, independent evolutionary history, dating back to the early Mesozoic (about 200 million years ago), retention of several primitive anatomical features and apparently restricted distribution, warrant its recognition as a living fossil."

Anguilliformes, a distinct group of bony fishes, first appeared in the fossil record about 100 million years ago. They eventually lost their pelvic fins, and their dorsal, anal and caudal fins became continuous. Living eels are very diverse and can be found in a large variety of habitatsfrom shallow coastal waters to the deep open ocean.

"The discovery of this extraordinary and beautiful new species of eel underscores how much more there is to learn about our planet," Johnson said. "Furthermore, it brings home the critical importance of future conservation effortscurrently this species is known from only 10 specimens collected from a single cave in Palau."


'/>"/>

Contact: John Gibbons
gibbonsjp@si.edu
202-633-5187
Smithsonian
Source:Eurekalert  

Related biology news :

1. Jefferson scientists deliver toxic genes to effectively kill pancreatic cancer cells
2. Scientists identify novel inhibitor of human microRNA
3. Argonne scientists peer into heart of compound that may detect chemical, biological weapons
4. MU scientists go green with gold, distribute environmentally friendly nanoparticles
5. Scientists identify gene that may contribute to improved rice yield
6. Scientists discover why a mothers high-fat diet contributes to obesity in her children
7. MU scientists see how HIV matures into an infection
8. Earth scientists keep an eye on Texas
9. Thinking it through: Scientists call for policy to guide biofuels industry toward sustainability
10. Scientists identify a molecule that coordinates the movement of cells
11. Scientists Find new migratory patterns for Mediterranean and Western Atlantic bluefin tuna
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Scientists discover the most primitive living eel
(Date:3/1/2017)... BEDFORD, Mass. , March 1, 2017  Aware, ... and services, announced that Richard P. Moberg ... Officer and co-President and Chief Financial Officer and Treasurer ... will continue to serve as a member of the ... T. Russell , Aware,s co-Chief Executive Officer and co-President, ...
(Date:2/27/2017)... , Feb. 27, 2017   Strategic Cyber Ventures ... it has led a $3.5 million investment in  Polarity ... Strategic Cyber Ventures is DC based and is led ... Hank Thomas . Ron Gula , also a ... also participated in this series A round of funding. ...
(Date:2/21/2017)... N.Y. and PORTLAND, Ore. ... ) and the Avamere Family of Companies (Avamere Health ... today announced a six-month research study that will apply ... improve eldercare at senior living and health centers. By ... Avamere hopes to gain insights into physical and environmental ...
Breaking Biology News(10 mins):
(Date:3/23/2017)... -- GlobeImmune, Inc. today announced it has entered into a ... of its common stock to NantCell, Inc., a member ... sale of its common stock, NantCell has agreed to ... 200,000 shares, an estimated $2.0 million in value, of ... to enter into this strategic agreement with NantCell," said ...
(Date:3/23/2017)... York , March 23, 2017 According ... plasma products and derivatives market is fragmented due to the presence of ... such as Proliant, Thermo Fisher , and Sigma-Aldrich, compete with ... these three companies, collectively, held more than 76% of this market ... As ...
(Date:3/22/2017)... ... March 22, 2017 , ... Researchers face a ... lab samples to full-size tissues, bones, even whole organs to implant in people ... delivers blood deep into the developing tissue. , Current bioengineering techniques, including ...
(Date:3/22/2017)... 2017   iSpecimen ®, the marketplace ... Pathology Service (DPS), a full-service anatomic pathology reference ... United States , has joined a program offered ... (DHIN) to make human biospecimens and associated data ... program, announced in 2015 as a collaboration between iSpecimen ...
Breaking Biology Technology: