from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Plural form of hemichordate.
Sorry, no etymologies found.
The deuterostomes are made up of the chordates, hemichordates and the echinoderms.
The chordates are things with a central nervous system running down the length of the body the hemichordates are wormy things which are a sister group to the echinoderms though have some chordate-like properties including a munty degenerate version of a simple nerve cord which might be an evo precursor of same.
They focus on the fact they have proven, as we all expected, that cephalochordates+echinoderms is baloney just why nature published the delsuc phylogeny of deuterostomes just with no hemichordates is beyond me. crapcrapcrapcrapcrap!
The chordate phylum has all four of those traits, but there is another extremely interesting phylum that has some of them, the hemichordates.
The hemichordates are marine worms that have gill slits and a stub of a tail.
Gerhart, Lowe, and Kirschner have done just that in hemichordates, and have results that strengthen the affinities between chordates and hemichordates.
Actually, the Bourlat paper shows how better taxon sampling, by including the hemichordates ad xenoturbella, trashes delsuc’s weird cephalochordates+echinoderms.