Cnidaria Flashcards
What typ of symmetry does Cnidaria have?
Radial or biradial symmetry
What are cnidaria known as?
Tissue grade of organization
How many germ layers do Cnidaria have?
Diploblastic - 2 germ layers
What specialized cells do Cnidaria have? And what are on these cells?
Cnidoblast cells = have nematocysts which are unique stinging organelles
What is the larva stage of the cycle of Cnidaria?
Planula (free-swimming and flatten body)
What are the 2 types of adult morphology of Cnidaria?
1- Polyp
2- Medusa
What is the example, movement and location of mouth of a polyp Cnidaria?
Hydroid
Sessil
Mouth at top end with tentacle surrounding it
What is the example, movement and location of mouth of a medusa Cnidaria?
Jellyfish
Float/free swimming = mobile
Mouth underneath with tentacles surrounding it
What are the 3 layers inside both polyp and medusa Cnidaria? In to out
Gastrodermis
Mesoglae
Epidermis
What are the 4 classes of Cnidaria?
1- Anthozoa
2- Scyphozoa
3- Hydrozoa
4- Cubozoa
What is the class Scyphozoa of Cnidaria known as? What contradicts this?
True jellyfish = all medusa
Have some polyp larval stage
What morphology does the class Cubozoa of Cnidaria have?
Medusa stage predominant
What is the morphology of the class Hydrozoa of Cnidaria?
Polyp and medusa in some spp
Where are the nematocysts found in the class Hydrozoa of Cnidaria?
Only in epidermis
How do the class Hydrozoa of Cnidaria reproduce? Called?
Asexual and sexual with separate sexes (gonochoristic or dioecious)
