The Porifera phylum includes simple
aquatic organisms known as sponges.
These are primitive animals, mostly
marine, that lack true tissues and organs
but have specialized structures for filtering
water to obtain nutrients.
It is multicellular, formed
by eukaryotic cells that
lack of cell walls
Tissue/Organ/Organ System
Radial
Coelenterata
(Cnidaria)
The phylum Cnidaria includes aquatic, mostly marine animals
that are known for their simple body structures and stinging cells. This group includes jellyfish,
corals, sea anemones, and hydras.
Ctenophora
Ctenophores, commonly known as comb jellies, are marine
invertebrates recognized for their unique features,
particularly their method of movement and
bioluminescence.
Bilateral
Without body cavity
(aceolomates)
Platyhelminthes
Are animals with a body space
filled with fluid. This space helps
them move and spread nutrients
With false coelom
(pseudocoelomates)
Aschelminthes
Pseudocoelomates are animals that have a body cavity, but it is not fully lined with mesodermal
tissue, making it a "false coelom." The body cavity, known as the pseudocoelom, is a fluid-filled space
between the digestive tract and the body wall.
With true coelom
(coelomates)
Annelida
Arthropods
Mollusca
Echinodermata
Hemichordata
Chordata
Coelomates are animals that have a true coelom,
a body cavity completely lined with mesodermal
tissue. This coelom acts as a fluid-filled space
between the digestive tract and the body wall,
providing several important advantages in terms
of structure, movement, and organ development.