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Keyword: vertebrates

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  • SEA LIFE PHOTOS: Five New Pygmy Seahorse Species Found

    02/07/2009 3:15:39 PM PST · by JoeProBono · 39 replies · 1,803+ views
    nationalgeographic ^ | February 5, 2009--
    The Walea pygmy seahorse is one of five species named in a flurry of recent seahorse discoveries from coral reefs in the Red Sea and Indonesia. All five are less than an inch tall (2.5 centimeters) and are among the tiniest known vertebrates.
  • The Problem With Evolution

    09/26/2005 5:44:09 AM PDT · by DARCPRYNCE · 340 replies · 6,041+ views
    ChronWatch ^ | 09/25/05 | Edward L. Daley
    Charles Darwin, the 19th century geologist who wrote the treatise 'The Origin of Species, by means of Natural Selection' defined evolution as "descent with modification". Darwin hypothesized that all forms of life descended from a common ancestor, branching out over time into various unique life forms, due primarily to a process called natural selection. However, the fossil record shows that all of the major animal groups (phyla) appeared fully formed about 540 million years ago, and virtually no transitional life forms have been discovered which suggest that they evolved from earlier forms. This sudden eruption of multiple, complex organisms is...
  • The Draft Genome of Ciona intestinalis: Insights into Chordate and Vertebrate Origins

    12/13/2002 8:04:31 AM PST · by Right Wing Professor · 6 replies · 379+ views
    Science ^ | Paramvir Dehal
    The first chordates appear in the fossil record at the time of the Cambrian explosion, nearly 550 million years ago. The modern ascidian tadpole represents a plausible approximation to these ancestral chordates. To illuminate the origins of chordate and vertebrates, we generated a draft of the protein-coding portion of the genome of the most studied ascidian, Ciona intestinalis. The Ciona genome contains ~16,000 protein-coding genes, similar to the number in other invertebrates, but only half that found in vertebrates. Vertebrate gene families are typically found in simplified form in Ciona, suggesting that ascidians contain the basic ancestral complement of genes involved...