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Phylum Porifera PowerPoint PPT Presentation


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Phylum Porifera. 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 - PowerPoint PPT Presentation

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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