Kingdom Porrifera mainly includes asymmetrical organisms,which are normally known as “sponges” they are basically multicellular in nature and have cellular level of organisation .

They have a type of water transport systems commonly known as “canal system “,in which water enters through minute pores called -”ostia"In the body wall into the central cavity known as-"spongocoel".

These are basically "hermaphrodite" in nature  means male and female gametes are present in the same organism.

Or you can also say a that sexes are not seprate. They mainly reproduced asexually by fragmentation and sexually  by the formation of gametes. Fertilization is internal and development is indirect as they have a larval stage too,which is mainly morphological different from adult.

 In this Porrifera the water pathway are very beneficial

🔴👉 for food gathering 

🔴👉respiratory exchange 

🔴👉removal of waste.

These porifera or we can say sponges have basically a type of skeleton made up of "spicules" or “spongin fibres”

Some important Examples are:-

🔴👉Spongilla 

🔴👉Sycon

🔴👉Euspongia 

The above examples are also known by other names like below 👇👇👇

👉Bath sponge(Euspongia)

👉scypha(Sycon)

👉fresh water sponge(Spongilla).

These sponges are generally marine in nature. 

🔴👉some other characteristics of sponges are below:-

➡️ morgans are basically absent in sponges.

➡️ there body is mainly cylindrical in appearance. 

➡️ "Spicules" are secreted by  👉Scleroblast👈and  "spongin fibres are secreted by -👉spongioblasts.

➡️ They have nuerosensory cells which are devoid of  any specific system. 

➡️ There mode of nutrition is 👉Holozoic👈.

This phylum Porrifera is further devided into 3 main class these are below:-

🔴👉1.CALCARIA-

They are commonly found in marine,shallow and coastal water.and there skeleton is made up of 👉calcareous spicules made up of calcium carbonate and exhibit  radial symmetry .

They have leuconoid,asconoid and syconoid type body organisations. 

Example- scyoga.

🔴👉2.HEXACTINELLIDS:-

They mainly found in deep sea and are also marine in nature. There skeleton is made up of 6 rayed ciliceous spicules.

They have basically sycon or leucon type canal system. 

Example-Eucaptella

👉🔴3.DESMOSPONGIAE:-

These are also a type of sponges which are basically  found in marine or freshwater. 

They possess a leconoid type of canal system. 

There skeleton is made up of- spongin ,siliceous spicules which are mono axon or taxon in nature. 

Example- spongilla.

Porifera are mainly attracted to seafloor and cannot move  from one place to another  due to this nature they share this characteristic with plants.