Echiurida
A Dictionary of Zoology | Date: 1999
Echiurida (spoon worms) A phylum of coelomate (see
COELOM), marine, worm-like animals in which mature individuals lack
metameric segmentation. The body consists of a sausage-shaped, cylindrical trunk and an anterior, muscular
proboscis that cannot be retracted (unlike the
introvert of
Sipunculida which Echiurida otherwise resemble in size and shape).
Parapodia are absent in most forms. All have a pharynx. The nervous system is similar to that of
Annelida, but there are no special sense organs. Males and females occur. They are exclusively marine, and most are burrowers and
detritus feeders.
© A Dictionary of Zoology 1999, originally published by Oxford University Press 1999.
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