porifera[not in compatibility mode]

8/14/2019 Porifera[not in compatibility mode]

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PORIFERAORIFERA Phylum of Sponges

:Produced by :Produced by Harold Feyman Dureza Harold Feyman Dureza

Ela Marie Sofia Celiz Ela Marie Sofia Celiz


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...Some basic characteristics ...Some basic characteristics .It has no definite symmetry .It has no definite symmetry

, .The body is multicellular has few tissues and no organs, .The body is multicellular has few tissues and no organs

The cells and tissues and surround a water filled space but there is no The cells and tissues and surround a water filled space but there is no.true body cavity .true body cavity

. .All are sessile Some attach themselves to something as an adult. .All are sessile Some attach themselves to something as an adult

.Reproduces sexually or asexually The sexual reproduction can either be.Reproduces sexually or asexually The sexual reproduction can either be.gonochoristic or hermaphroditic .gonochoristic or hermaphroditic

.It has no nervous system .It has no nervous system

.It has a distinct larval stage which is planktonic .It has a distinct larval stage which is planktonic

.All are filter feeders .All are filter feeders

.It often has a skeleton of spicules .It often has a skeleton of spicules


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A N A T O M YN A T O M Y

The body of a sponge is a collection of a few different types of cells that are closely arranged in a gelatinous matrix called a mesohyl , mesoglea , or a

mesenchyme .

H A T I S T H I S M E S O H Y L ? H A T I S T H I S M E S O H Y L ?

A mesohyl is a connective tissue of a sponge body wherein A mesohyl is a connective tissue of a sponge body wherein.it is supported by skeletal elements It functions as an.it is supported by skeletal elements It functions as an

( ) ,endoskeleton internal skeleton of an animal in most sponges and( ) ,endoskeleton internal skeleton of an animal in most sponges and is the only skeleton in soft sponges that encrust hard surfaces as is the only skeleton in soft sponges that encrust hard surfaces as

.rocks .rocks


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. . .kele ton . . .kele ton

:There are two kinds of skeletons that the poriferans have :There are two kinds of skeletons that the poriferans have exoskeletonxoskeleton and andendoskeletonndoskeleton ..EndoskeletonEndoskeleton

, . ,Like vertebrates sponges also have endoskeletons Endoskeletons, . ,Like vertebrates sponges also have endoskeletons Endoskeletons, .as said from the previous slide is the internal skeletal system In, .as said from the previous slide is the internal skeletal system In

, .sponges it is actually a layer of covering cells The layer that these, .sponges it is actually a layer of covering cells The layer that these cells form is called a cells form is called a mesohylesohyl . This mesohyl is usually stiffened by. This mesohyl is usually stiffened by

, .mineral spicules spongins fibers or both, .mineral spicules spongins fibers or both

ExoskeletonExoskeleton.Some sponges also excrete exoskeletons These exoskeletons are layers.Some sponges also excrete exoskeletons These exoskeletons are layers

. .of flagellated cells They lie completely outside their organic components. .of flagellated cells They lie completely outside their organic components, For example sclerosponges or hard sponges have massive calcium carbonate, For example sclerosponges or hard sponges have massive calcium carbonate. .exoskeletons Pinacocytes from the animal s skin excrete the exoskeletons. .exoskeletons Pinacocytes from the animal s skin excrete the exoskeletons


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-HAT ARE THESE SO CALLED SPICULES?

, - -They are hard crystal like spines that support skeletal like.structures

,Normally they work in conjunction with spongins which are

protein that forms a tough fibrous network throughout the.sponge

-They are also non living aggregates of a chemical nature that, .are made from either silica or calcium carbonite

.They are important in the classification of sponges


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h e 3 h e 3 l a s s e s o f l a s s e s o f

P o r i f e r ao r i f e r a


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LASS CALCAREALASS CALCAREA

The calcareous sponges of phylum Porifera is identified to have 2 to 4 The calcareous sponges of phylum Porifera is identified to have 2 to 4.points on the spicule .points on the spicule .All species are marine dwellers .All species are marine dwellers : , ,All sponge body plans are represented by this class asconoid syconoid: , ,All sponge body plans are represented by this class asconoid syconoid

.leuconoid .leuconoid

, - .They are very small usually 3 4 inches in height, - .They are very small usually 3 4 inches in height .There are 400 species existing of this class .There are 400 species existing of this class .Generally lack hollow canals .Generally lack hollow canals

.They are sedentary filter feeders .They are sedentary filter feeders .Their body type can either be radially symmetrical or irregular .Their body type can either be radially symmetrical or irregular


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L ASS D EMO SPO NG IA EL AS S D EMO SP ONG IA E

.The largest class in phylum Porifera .The largest class in phylum Porifera % .They contain 90 of all species of sponges% .They contain 90 of all species of sponges , .Predominantly their structures are leuconoid, .Predominantly their structures are leuconoid Most are marine dwellers but several live in Most are marine dwellers but several live in

.freshwater areas .freshwater areas .They reproduce both sexually and asexually .They reproduce both sexually and asexually


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L AS S H EXA CT IN EL LI DAL ASS HE XA CT INE LLI DA

These are sponges with a skeleton made of four or six pointed.silaceous spicules .They are often referred to as glass sponges They are relatively uncommon and most are found at substantial

.depths -They are usually cup shaped animals with sturdy endoskeletons made

.up of fused spiculesThey have a unique system for rapidly conducting electrical

,impulses through their bodies making them easy to respond to

.external stimuli


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O U R C E S

O U R C E S : / / . . /h t t p w ww w ik ip ed i a o r g: / / . . /h t t p w ww w i k i pe d i a o r g : / / . . /h t t p w w w g o o g l e c o m: / / . . /h t t p w w w g o og le c o m : / / . . /h t t p i ma ge s g oo g l e c o m: / / . . /h t t p i ma ge s g oo g l e c o m M i c r o s o f t S t u d e n t E n c a r t a 2 0 0 9 M i c r o s o f t S t u d e n t E n c a r t a 2 0 0 9
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