Transcript Ectoprocta (Bryozoa)

Ectoprocta (Bryozoa)
Moss animals

8) Has no excretory system.
9)Has a lophophore.
10)Reproduction normally sexual
11)Feeds on fine particles in the water.
12)All live in aquatic environments mostly
marine.

1)Bilaterally symmetrical.
3)Body cavity a true coelom.
4)Body possesses a U-shaped gut with an anus.
5)Body enclosed in a calcareous, chitinous or
gelatinous box, tube or communal matrix.
6) gaglia nno brain
7)Has no circulatory system or gaseous
exchange organs.



Colonies of Bryozoans are started by a single
individual, which after its larval existence settles
onto a substrate and after a little growth begins
to reproduce asexually (by budding).
Thus a colony is composed entirely of clones of
the first animal Colonies can grow quickly
The individual animals within a colony are called
zooids. Each zooid secretes and lives inside a
non living case called a zooecium

Each zooecium has a hole at the top
called an orifice through which the animal
can extend its ring of tentacles or
lophophore when it is feeding. In some
species this orifice can be sealed shut by
a sort of door called an operculum.

There are many different types of
bryozoan colonies. Some form crusty
skins on top of shells, docks or other hard
surfaces and are called encrusting
bryozoans. Some colonies form solid
towers, which grow up into the water
column.