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

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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 calcarea1
Class Calcarea
  • also known as Calcispongiae
  • have spicules of calcium carbonate
  • all marine

Leucosolenia

class hexactinellida1
Class - Hexactinellida
  • Glass sponges;
  • have siliceous spicules,
  • body often cylindrical or funnel shaped
class demospongiae1
Class - Demospongiae
  • have siliceous spicules,spongin, or both
  • one freshwater family
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