Porifera Flashcards
Sponge bodies do not have organs, instead they have masses of cells supported by
spicules or spongin.
The pores in the surface of a sponge that pass incoming water to the body are called __________ and the opening by which water passes out of the sponge is called the __________.
ostia, osculum
The flagellated cells that line the canals of the sponge are called A) choanocytes. B) porocytes. C) pinacocytes. D) ostia.
A) choanocytes.
In a syconoid type of sponge, the choanocytes are located in the A) incurrent canals. B) radial canals. C) excurrent canals. D) spongocoel.
B) Radial canals
Of the three types of body or canal designs in sponges, which is the most complex, as it is composed of multiple flagellated chambers?
leuconoid
Which type of cell in sponges moves around in the mesohyl
Archaeocytes
When sponges reproduce asexually by internal buds, these are called gemmules. True of False
True
The nervous system of the poriferans is a nerve net. True or False
False. No nervous system like other organisms
What is an adult sponge called
A sessile
What are the general characteristics of Poriferans?
No true tissue, Multi cellular-differentiated cells
Radially/asymmetrical. Collagen skeleton and crystalline spicules.
Pinacocytes (Outer) and Choanocytes (Inner layer)
Asexual (Gemmules) Sexual (Flagellated larve gametes)
What defines a homoscleromorpha class
Skeleton absent or of siliceous spicules without axial filament
What defines a Calcarea class
Calcium carbonate spicules
How are the Demosponglae Siliceous spicules organised around an axial filament
- Sponge net work often present
2. spicule not with 6 rays
How are the Hexactinellida Siliceous spicules organised around an axial filament
- Syncytial trabecular reticulum.
2. Spicules with 6 rays
