Cnidaria Flashcards
The cnidarian body form that is adapted for floating or free swimming is the A) mesoglea. B) polypoid. C) medusa. D) polyp.
C) Medusa
The medusa body form is commonly called a jellyfish and is buoyant because it has a lot of the material called
Mesoglea
A strobila is a structure found in the life cycle of members of the class A) Hydrozoa. B) Scyphozoa. C) Cubozoa. D) Anthozoa.
B) Scyphozoa
Which of the following groups includes the soft and horny corals? A) Zoantharia B) Ceriantipatharia C) Scyphozoa D) Octocorallia
D) Octocorallia
The subclass of the anthozoans that includes the sea anemones, hard corals, and others is the subclass …….
Zoantharia
The larval stage characteristic of the Cnidaria is the \_\_\_\_\_. A) amphiblastula B) planula C) veliger D) parenchymula
B) Planula
What are the 3 main classes of Cnidarians?
Hydrozoa (Sea serpent)
Scyphozoa (Jelly fish)
Anthozoa (Reef building corals)
What are the main characteristics of Cnidarians
Cnidocytes present. Radially symmetrical. Polyps/medusae stages. Diploblastic. Gastrovascular cavity. No excretory/respiratory system. Nerve net. Sexual/asexual
A brief description of Hydrozoa
Solo or in colonies (Free swimming or sessle)
Mostly asexual polyp and sexual medusae.
Typically more polyps
A brief description of Scyphozoa
Small or lost polyp stage.
Asexual polyp/Sexual medusae
A brief description of Anthozoa
No medusae stage. Coelenteron partitioned by mesenteries with Septa. Asexual via fussion, or pedal leceration. Polyp produces gametes
What is a Coelenteron?
A gastrovascular cavity
What is Mesenteries?
a membrane inside the body cavity of an animal
What are septa
Supportive tissue to support polyp growth
How can CO2 affect coral reefs
CO2 dissolved in oceans raises the waters pH level. This eats away at the corals calcium carbonate
