Porifera Flashcards
Meaning behind porifera
Pore bearing
Characteristics of sponges
Assymetrical, 2 cell layers, lacking tissues + muscles and nerves, filter feeders
Flattened cell making up the epidermis of the sponge
Maintains size and structure by slight expansions and contractions
Pinacocyte
Elongated tube like cell that creates pores in sponges
Porocyte
Flagrllated cell in sponges with cytoplasmic extensions
Choanocyte/collar cell
Cell in sponges that aid in water flow, capturing/filtering food, and capture of gametes
Choanocyte/collar cell
Cells that exhibit totipotency (can change into different types)
Archeocytes
Cells that form spiricles
Archeocytes
Class of sponges that are found in shallow marine water, have spicules made entirely of calcium carbonate, and the only class with the asconoid form
Class calcarea
Class of massive sponges with spicules made of silica and spongin. Body form is predominantly leuconoid.
Only class with a freshwater species
Class demospongia
Class of sponges with Spiricles made of silica fibers, and no definitive layers.
Able to conduct electrical impulses to respond to external stimuli
Class hexactinellida/ the glass sponges
Class of sponges that are massive and encrusting with very few and unique spiricles
Class homoscleromorpha
T/F
Adult sponges lack nerve cells
True
How can sponges move
Contractions of the pinacocytes, flushing sediments from ostia
Forms of sexual reproduction in sponges
Hermaphroditism, internal fertilization
bringing forth live young that have developed inside the body of the parent
Viviparous
Type of sponge larvae that is hollow and oval, with the anterior half bearing flagella and the posterior half free from flagella
Amphiblastula
Type of sponge larvae that is solid, oval or flattened, and covered in flagella
Parenchymula
Cells found in sponge larvae that may provide sensory capability in sponge larvae and contain genes important for signal receiving structure in the neurons of all animals
Flask cells
Empty space within the sponge
Spongocoel
A gelatinous, non living layer of material in sponges
Mesohyl
The support elements in sponges that can be calcarious or siliceous
Spicules
Water flows into the spongocoel through narrow ___ and exits through larger ___
Ostia, oscula
Body forms in sponges
Asconoid, syconoid & leuconoid
Fibrous material found in sponges
Spongin
Flagellated cells that control water flow through the sponge
Chaonocytes
Most complex sponge body form
Leuconoid
Phylum of metazoans with the simplest body form that filter feed
Porifera
Simplest sponge body form
Asconoid
Neither the most nor least complex sponge body form
Syncoid
outward opening of sponges where water flows out
osculum
opening in sponges where water flows in
ostium
small ball-like structure left behind that develop into new sponge when in favorable conditions
reduction bodies
internal buds formed within the sponge body
gemmules
