Describes an animal which, as an
embryo, had two distinct
embryonic tissue layers - the
ectoderm and
endoderm. This is in contrast to animals which are
triploblastic (have three distinct tissue layers) and those which do not have any distinct
tissue layers as an
embryo (nor
organs and distinct tissues as an
adult).
Jellyfish and
comb jellies are diploblastic animals.
From the BioTech Dictionary at http://biotech.icmb.utexas.edu/. For further information see the BioTech homenode.