Phylum Porifera
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Phylum Porifera







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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
Phylum Porifera

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Slide 1

Phylum Porifera

Slide 2

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.

Slide 3

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)

Slide 4

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

Slide 5

Class Calcarea

Slide 6

Class Calcarea

  • also known as Calcispongiae

  • have spicules of calcium carbonate

  • all marine

Leucosolenia

Slide 7

Leucosolenia

Slide 8

Grantia (Scypha)

Slide 9

Schypha (Spicules)

Slide 10

Class - Hexactinellida

Slide 11

Class - Hexactinellida

  • Glass sponges;

  • have siliceous spicules,

  • body often cylindrical or funnel shaped

Slide 12

Class - Hexactinellida

Slide 13

Class - Demospongiae

Slide 14

Class - Demospongiae

  • have siliceous spicules,spongin, or both

  • one freshwater family

Slide 15

Gemmule

Slide 16

Cliona

Slide 17

Cliona

Slide 18

Cliona killing a coral


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