Good morning, all, 

Day 3 summary

Porifera are parazoans (handicapped animals) as they lack neurons. The animal nature was established by Robert Grant.

Poriferans are mostly marine, exhibit cellular level of organization, and they are asymmetrical.

The characteristic feature of Porifera is Water Canal System which helps in gathering food, exchange of gases and removal of wastes.

Body of sponges is supported by Spicules made of either calcium carbonate or silica. it also has softer spongin fibers.

Sexes are not separate, and reproduction is asexual or sexual. Fertilization internal and development indirect with larval forms.

Spongilla is fresh water porifera, Euspongia is bath sponge.

Euplectella is Venus flower basket.