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Phylum Porifera - PowerPoint Slideshow


General Characteristics. Most are marine; a few live in fresh water one family SpongillidaeMetazoan, with loosely aggregated cells, therefore no organs or true tissues.Asymmetrical or radial symmetryBody with pores (ostia and osculum), canals, and chambers through which a water current flows..

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Phylum Porifera

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Phylum porifera

Phylum Porifera


General characteristics

General Characteristics

  • Most are marine; a few live in fresh water one family Spongillidae

  • Metazoan, with loosely aggregated cells, therefore no organs or true tissues.

  • Asymmetrical or radial symmetry

  • Body with pores (ostia and osculum), canals, and chambers through which a water current flows.


General characteristics1

General Characteristics

  • Epidermis of flat pinacocytes;

  • Inner surfaces lined with flagellated collar cells (choanocytes)-create water currents

  • matrix called mesohyl contains amebocytes

  • and skeletal elements

  • Skeleton of calcareous or siliceous crystalline spicules and/or protein fibers (spongin)


General characteristics2

General Characteristics

  • Digestion intracellular

  • Respiration and excretion by diffusion

  • Nervous system absent

  • All adults sessile and attached to substrate

  • Asexual reproduction by buds or gemmules

  • Sexual reproduction by eggs and sperm

  • Free-swimming ciliated amphiblastula larvae


Class calcarea

Class Calcarea


Class calcarea1

Class Calcarea

  • also known as Calcispongiae

  • have spicules of calcium carbonate

  • all marine

Leucosolenia


Leucosolenia

Leucosolenia


Grantia scypha

Grantia (Scypha)


Schypha spicules

Schypha (Spicules)


Class hexactinellida

Class - Hexactinellida


Class hexactinellida1

Class - Hexactinellida

  • Glass sponges;

  • have siliceous spicules,

  • body often cylindrical or funnel shaped


Class hexactinellida2

Class - Hexactinellida


Class demospongiae

Class - Demospongiae


Class demospongiae1

Class - Demospongiae

  • have siliceous spicules,spongin, or both

  • one freshwater family


Gemmule

Gemmule


Cliona

Cliona


Cliona1

Cliona


Cliona killing a coral

Cliona killing a coral