Phylum Porifera Flashcards
Phylum Porifera
“The sponges”
Choanoflagellates and Sponges
Characteristics
Multicellular
Functional tissues
Lacks organ systems
Asymmetric
Filter Feeders
Important structures
Not all present in sponges
Spongocoel
Ostia & Osculum
Mesohyl
Spicules
Spongin
Spongocoel
Inner part
Ostia & Osculum
Inner and Outer openings
Mesohyl
jelly filling
Spicules
Rigid support
Spongin
Flexible support
(more common than spicules)
Ecology
Mostly marine
Mobile larvae and Sessile adults
Feeding and Digestion
Filter feedings
Choanocytes
Intracellular Digestion
Ostia -> Osculum
Choanocytes
Cells on inside beat in unison to draw things in or push things out of the sponge
Reproduction
Monoecious
Gemmules
Amoebocyte -> formation of egg
Monoecious
One individual has both reproductive potential
(Male and female organs)
Gemmules
Created during environmental stress
Four Classes
Hexactinellida
Calcarea
Demospongia
Sclerospongiae
Hexactinellida
Glass sponges
No spongin
Has silica
Calcarea
Calcareous sponges
No spongin
Has calcium carbonate support system
Demospongia
Demosponges
Has Spongin and Spicules
Most common of the four types
Sclerospongiae
Coralline sponges
Layers of CaCO3 (Calcium carbonate)
Similar to tree rings