Extensive Definition
Diploblasty is a condition of the ovum in which
there are two primary germ layers:
the ectoderm and
endoderm.
Diploblastic organisms are organisms which evolve
from such an ovum, and include cnidaria and ctenophores.
The endoderm allows them to develop true tissue.
This includes tissue associated with the gut and associated glands.
The ectoderm on the other hand gives rise to the epidermis, the
nervous tissue, and if present, nephridia.
Simpler animals, such as sea sponges,
have one germ layer and lack true tissue organisation.
All the more complex animals (from flat worms to
man) are triploblastic with three
germ layers (a mesoderm
as well as ectoderm and endoderm). The mesoderm allows them to
develop true organs.
See also
diploblastic in Catalan: Diblàstic
diploblastic in Spanish: Diblástico
diploblastic in French: Diploblastique
diploblastic in Norwegian Nynorsk:
Diploblastiske dyr
diploblastic in Polish:
Dwuwarstwowce