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Encyclopedia Britannica - Main :: HEG-HIG |
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HEMICHORDA, or HEMICHORDATA , a zoological term
special
chief
axis
body
series of perforations leading to the exterior. These structures are the gill-slits, which in fishes are lined with vascular tufts, but which in terrestrial breathing animals appear only in the embryo. The third feature of importance is the position of structure of the central nervous
system
body
condition , but the notochord is present only in the tail, whilst in the adult the notochord disappears and the nervous
system
Hemichorda
The Hemichorda
GLOSSUS), but the relationship to the Chordata expressed in the designation Hemichordata cannot be regarded as more than an attractive theory with certain arguments in its favour. (P. C. M.) End of Article: HEMICHORDA, or HEMICHORDATA If you wish, you can link directly to this article.
<a href="http://jcsm.org/StudyCenter/Encyclopedia/HEG_HIG/HEMICHORDA_or_HEMICHORDATA.html"> HEMICHORDA, or HEMICHORDATA </a> |
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