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Most primitive living eel discovered: Creating a new species, genus and family of animal

Date:
August 17, 2011
Source:
Smithsonian
Summary:
Scientists 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.

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.
Credit: Jiro Sakaue

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.

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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 habitats -- from 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 efforts -- currently this species is known from only 10 specimens collected from a single cave in Palau."


Story Source:

The above story is based on materials provided by Smithsonian. Note: Materials may be edited for content and length.


Journal Reference:

  1. G. D. Johnson, H. Ida, J. Sakaue, T. Sado, T. Asahida, M. Miya. A 'living fossil' eel (Anguilliformes: Protoanguillidae, fam. nov.) from an undersea cave in Palau. Proceedings of the Royal Society B: Biological Sciences, 2011; DOI: 10.1098/rspb.2011.1289

Cite This Page:

Smithsonian. "Most primitive living eel discovered: Creating a new species, genus and family of animal." ScienceDaily. ScienceDaily, 17 August 2011. <www.sciencedaily.com/releases/2011/08/110817120233.htm>.
Smithsonian. (2011, August 17). Most primitive living eel discovered: Creating a new species, genus and family of animal. ScienceDaily. Retrieved March 6, 2015 from www.sciencedaily.com/releases/2011/08/110817120233.htm
Smithsonian. "Most primitive living eel discovered: Creating a new species, genus and family of animal." ScienceDaily. www.sciencedaily.com/releases/2011/08/110817120233.htm (accessed March 6, 2015).

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