2. ASCON SPONGE-LEUCOSOLENIA
Phylum:Porifera
Class : Calcarea
Order : Homocoela
INTRODUCTION
1.It is simple type of
sponge called asconoid
sponge.
2.Its body is perforated by
numerous pores. Hence
included in the phylum
Porifera.
3. HABIT AND HABITAT
1. It is marine colonial sponge
attached to rocks.
1. It is found in sea-shore areas
where the tidal action is heavy.
4. STRUCTURE
1.It is a branched colony.
2.It consists of horizontal
tubes and vertical tubes.
3.The horizontal tubes are
branched and they have
adhesive discs that helps
to attach to the
substratum.
4.The vertical tubes are
unbranched.It is 2.5cm in
height.
5. 4. The surface of the body
contains numerous
minute openings called
ostia.
5. The ostia open into a
large cavity called
spongocoel located
inside the body.
6. The spongocoel opens to
the outside by csculum
situated at the free end
of the body.
BODY WALL
1. The body wall is
diploblastic.
2. It is formed of an
outer ectoderm and
inner choanoderm.
3. There is a gelatinous
substances lying in
between them,
called mesenchyme.
6. Reproduction
It occurs in asexual and sexual methods.
ASEXUAL REPRODUCTION
1.It takes place by
budding.
2.A bud developed from
the base of the
individual as an
outgrowth.
3. It grows in length and
develops an osculum at
the free end.
7. SEXUAL REPRODUCTION
1.It is hermaphrodite.
2.Gonads are not formed.
Gametes are produced by
the archaeocytes.
3.Sperms and ova are
released into the water.
