Ctenophores, or comb jellies
, are among the most beautiful of the marine zooplankton, with iridescent waves of color coursing along their ciliary rows.
Fossils about 520 million years old from six species of comb jellies
show signs of hard parts, such as rigid spokes and hard plates, says Qiang Ou of China University of Geosciences in Beijing.
build a nervous system essentially using their own biological language, Moroz explained.
They do this by comparing the order of the chemical bases of DNA-150 million base pairs for comb jellies
versus 3 billion in humans-that comprise the organism's genome.
By 1989, researchers estimated that the weight of all these comb jellies
in the Black Sea was 1 billion tons; that's about equal to the weight of all the fish caught in all the oceans that year.
(Ctenophora): a model for basal metazoan evolution and development.
Scientists thought that comb jellies
emerged after this point because they possess both a nervous system (complete with a rudimentary brain) and muscles.
See a hidden gem in our state park system; it's a great beach to go with young children to search for snails, comb jellies
and other marine life.
A genomic analysis of comb jellies
confirmed that the squishy marine predators are the new oldest animals, bumping the much simpler sea sponges from the base of the animal evolutionary tree (SN: 5/18/13, p.
Previously, it was thought that either super simple-structured or comb jellies
were at the root of the non-bilaterian animal tree.
Peroxide at 3 ppm was three times more efficient at disinfection than 1 ppm for plankton and approximately twice as effective for the comb jellies
A similar question echoes through freelance writer Amy Maxmen's piece on comb jellies
and animal evolution--another we might have skipped if we had gone to the counter method.