Sponges Flashcards
1
Q
Phylum Porifera classes
A
- Class Calcarea
- Class Hexactinellida
- Class Desmospongiae
2
Q
Phylum Porifera characteristics
A
- multicellular
- no tissue level organization
- no nervous system
- no gonads
- no digestive system; done intracellularly
- filter feeders
- some have larval stage
3
Q
What are pinacocytes?
A
- external cell layer in sponges
- some are specialized porocytes
- provides protective and structural role
4
Q
What are porocytes?
A
- pore cell for water entry in sponges
- only in simple sponges eg. asconoid
5
Q
What are choanocytes?
A
- lines the internal cell wall in sponges
- creates current to intake food with flagella
- can engulf food particles
6
Q
What is the mesohyl?
A
- gelatinous protein matrix in sponges
- between pinacoderm and choanocytes
- has skeletal material and ameboid cells
7
Q
What are archeocytes?
A
- used for digestion and feeding in sponges
8
Q
What are spicules?
A
- skeletal structures in mesohyl
- made of silica or calcium carbonate
9
Q
Ostium is:
A
- pores for incoming water
10
Q
Osculum is:
A
- large opening for water to EXIT
11
Q
What is the spongocoel?
A
- also known as atrium
- central cavity of sponge
12
Q
How do sponges reproduce?
A
- monoecious eg. hermaphrodytes
- dioecious eg. separate sexes
- can be sexual or asexual
13
Q
What is the larval stage for sponges that reproduce sexually?
A
- parenchymula larva
14
Q
Characteristics of class Calcarea
A
- spicules composed of calcium carbonate
- primarily syconoid
15
Q
Characteristics of class Hexactinellida
A
- glass sponges
- spicules made of silica
- most are radially symmetrical
- primarily leuconoid
