BIO044 (LAB) MOD 7 PORIFERA (SPONGES) Flashcards
Are commonly known as sponges.
Phylum Porifera
Porifera translates to
“pore bearers”
Sponges are usually attached (sessile) and stationary animals in the adult stage, and their distribution
being brought about largely by their actively swimming flagellated larvae called _________.
Parenchymula
Sponges are more complex than protozoa, and in them, there is a division of labour among cells that
has resulted in___________.
cellular specialization
Types of cells and structures in a Poriferan body:
- Pinacocytes
- Mesohyl
- Choanocytes
- Amoebocytes/ Archaeocytes
- Spicules
- Spongin
- Spongocoel
- Osculum
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flattened epithelial cells that line and form the outer covering of the sponge
called__________.
Pinacoderm
A noncellular, gelatinous matrix containing and holding together the cells of the
sponge.
Mesohyl
Cells with a single flagellum surrounded by a collar of microvilli.
Choanocytes
They line the
pores of the sponge (called __________).
Dermal Ostea
Amoeba-like cells that are found near the choanocytes (to receive food particles for digestion) or scattered within the mesohyl.
Amoebocytes / Archeocytes
Small, sharp barbs or rods made of either silicone or calcium carbonate (or both).
Spicules
They are normally microscopic, but large
spicule (called __________) can be seen by the naked eye.
megascleres
Interconnecting collagen fibers throughout the mesohyl. It forms the skeletal framework of the sponge.
Spongin
A large, empty, central cavity of sponges where water collects after going through
the pores.
Spongocoel
A large opening in the spongocoel where the water exits.
Osculum
Canal Systems of Sponges:
- Asconoid
- Syconoid
- Leuconoid
The simplest body structure of sponges; small tube or vase shape; characterized by a
large chamber (spongocoel) that is lined by choanocytes, and a single osculum.
Asconoid
Similar to asconoid (tubular body with single osculum), but the body wall is thicker
and contains canals that are lined by choanocytes.
Syconoid
Largest and most complex body structure of sponges; The walls are filled with
many small circular chambers that are lined with choanocytes.
Leuconoid
This refer to the pores in a sponge body.
Dermal Ostea
These are small barb-like structures within the sponge.
Spicules
In this canal system, water that enter the pores goes through a series of small chambers lined with
choanocytes
Leuconoid
This cell phagocytizes the food particles captured by the choanocytes and digest them.
Amoebocytes
In this canal system, water enters the pores and are filtered in a spongocoel lined with choanocytes.
Asconoid
