• Share
  • Email
  • Embed
  • Like
  • Save
  • Private Content
Porifera
 

Porifera

on

  • 2,588 views

 

Statistics

Views

Total Views
2,588
Views on SlideShare
2,587
Embed Views
1

Actions

Likes
0
Downloads
85
Comments
0

1 Embed 1

http://blendedschools.blackboard.com 1

Accessibility

Categories

Upload Details

Uploaded via as Microsoft PowerPoint

Usage Rights

© All Rights Reserved

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Processing…
Post Comment
Edit your comment
  • Multicellular Body with pores (ostia) No organs or true tissues. No nervous system Adults sessile & attached to substratum. Skeleton of calcareous spicules , siliceous spicules , spongin or a combination. All aquatic, mostly marine.
  • Composed of 3 layers outer layer of flattened contractile cells (pinacocytes) inner non-living mesoglea containing a variety of specialized cells collar cells (choanocytes) which capture food, etc. from water flowing through channels. Exhibit asymmetry or radial symmetry . Reproduction - asexual by buds & gemmules. Sexual by eggs & sperm.
  • Calcium carbonate = chalk and limestone Silicon = sand (silicon dioxide) Collagen = main protein of connective tissue and changed into gelatin.
  • Fig. 12.11a
  • Large sponges filter 1500 liters/day *How important are they to the ocean environment? what would happen if there were too many? Too few? Choanocytes phagocytize Archeocytes digest No respiratory, excretory or nervous systems

Porifera Porifera Presentation Transcript

  • Phylum Porifera
  • Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Simple Sponge Morphology
  • Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Sponge Body Forms
  • Spicule
    • Skeleton of sponge
      • Calcium carbonate
      • Silicon
      • Collagen
  • Archeocyte
    • Amoeboid cells
    • Receive food from choanocytes
    • Differentiate into other cell types
  • Mesenchyme (Mesoglea or Mesohyl)
    • Gelantinous matrix
  • Pinococyte
    • Outer surface of sponge
    • Contractile
  • Choanocyte
    • Flagellated cells
    • One end in mesnchyme
    • Flagella creates water currents
    • Collar traps food
    • Passes food to archeocyte
  • Porocyte
    • Forms a pore
  • Asconoid Sponge Ostium Spongocoel Osculum Porocyte
  • Syconoid Sponge Osculum Ostium Spongocoel Choanocytes Radial Canal Incurrent Canal
  • Syconoid Sponge Spongocoel Ostium Choanocytes Radial Canal Incurrent Canal Scypha ( Grantia) xs
  • Leuconoid Sponge Choanocyte chamber Osculum Incurrent canal Excurrent canal Incurrent pore
  • Class Calcarea Grantia
    • Small
    • Vase shape
    • Spicules of calcium carbonate
      • Straight or 3-4 rays
  • Class Hexactinellida Euplectella
    • Spicules
      • Siliceous
      • 6 rays
  • Class Demospongiae Spongia
    • Spicules
      • Siliceous
      • spongin
  •  
  • Physiology
  • Sexual Reproduction
    • Monoecious
      • Both male and female
    • Sperm and egg derived from choanocytes
    • Ciliated larva
      • Swim to new location
    • Budding
    • Fragmentation
    • Gemmule formation
    • -survive freezing
    Asexual Reproduction Micropyle Spicule