phylum porifera
DESCRIPTION
Phylum Porifera. By: Joseph Chi and Taha Ali. Number of germ layers. It has one central cavity called the spongocoel . However, it has no tissues/germ layers. Symmetry. Asymmetrical, meaning the body has no symmetry because sponges are not always even. Ceolum. - PowerPoint PPT PresentationTRANSCRIPT
Phylum PoriferaBy: Joseph Chi and Taha Ali
Number of germ layersIt has one central cavity called the
spongocoel. However, it has no tissues/germ layers
SymmetryAsymmetrical, meaning the body has no
symmetry because sponges are not always even.
CeolumPhyla Porifera are Aceolomates which are
characterized by having solid bodies.
Digestive tractPhylum Porifera (sponges) do not have a
digestive system because they have no mouth or anus, rather digestion occurs within the sponge’s which is called intracellular digestion.
Cephalization• Cephalization is the concentration of nerves at the
anterior end of the body, which forms a head and a brain.
• Porifera have no cephalization.
SegmentationPorifera are not divided into repeated
segments.
Skeleton & Appendagesnone, the structures called spicules provide
support inside the sponge, also has no appendages.
Circulatory system and respiratory systemNone, however the Porifera (sponge) diffuses
the oxygen in the water into its cells as it moves through the body.
Porifera have no specific circulatory system or respiratory system.
They have a water flow system that supports these functions.
ReproductionCan be sexual or asexualSponges are hermaphroditic -produce eggs
(ova) and spermproduce ova and sperm at different times of
the year.Eggs and sperm are produced by the
amoebocytes (Mobile cells) .
HabitatLive in marine and freshwater, usually in
shallow water, and is sensitive to pollution.