Cnidarian I

Question 1

What are the different types cnidarians?

Answer 1

• some are pelagic, swim in the open ocean
  -some are benthic, meaning they are on the ocean floor
  -some are sessile, they attach to a substrate

Question 2

How do cnidarians protect themselves?

Answer 2

stings

Question 3

What are the synamorphies of Cnidarians?

Answer 3

Cnidocytes: they are larges cells that are under pressure. upon contact they will explode. they can have glues, poisons, and entangling threads.

Question 4

What is radial symmetry?

Answer 4

no matter how you cut a circle, it always ends up with two equal parts?

Question 5

Who are the only ones to have radial symmetry? Why?

Answer 5

Cnidarians; allows to them to have more access to food around them because they don’t move.

Question 6

What type of symmetry is most common for cnidarians?

Answer 6

4 equal parts

Question 7

What is dimorphism?

Answer 7

2 forms. polyps which gives rise to medusa, which gives rise to larva, which gives to polyps

Question 8

What is polymorphism?

Answer 8

colonel polyps that differentiate into different forms/jobs

Question 9

what do gastrozooids specialize in?

Answer 9

digestion

Question 10

what do dactylozooids specialize in?

Answer 10

tentacles for defense

Question 11

what do gonozoids specialize in?

Answer 11

reproduction

Question 12

What is the community ecology of Cnidarians?

Answer 12

multiple species interacting with each other, habitat creators such as coral reefs

Question 13

what does velum do?

Answer 13

helps give the jelly fish support and structure

Question 14

where does absorption occur?

Answer 14

in the gastrovascular cavity,

Question 15

what does the ring canal do?

Answer 15

takes nerves and nutrients all a round the rim of jellyfish

Question 16

what does manubirum do?

Answer 16

connects the mouth to the gastrovascular cavity

Question 17

what does the life cycle of obelia contain?

Answer 17

asexual and sexual life functions. grows asexually but will grow into may different parts

Question 18

what is the coenosarc?

Answer 18

living part of the animal; has nutrients which transport it around the organism. secretes the Persiac for protection

Question 19

what are hydocroals and why are they classified in the Hydrozoa?

Answer 19

they do not secrete medusa, but have a calcium based skeleton to live in. seen in the hard coral anthozoa

Question 20

scyphozoan morphology?

Answer 20

larger jellyfish, sometimes the largest in the ocean. long lappets. umbrella margin is scalloped. the jelly part of the jellyfish is the mesoglea

Question 21

What is the mesoglea?

Answer 21

most nonliving, gelatinous gastric, that are home to ameboid cells.

Question 22

What occurs wherever the scallops meet? Why?

Answer 22

Rhopalia. important area for sensing. includes ocelli and statocysts.

Question 23

what does ocelli do?

Answer 23

light sensitive cells that are good at detecting motion

Question 24

what are statocysts?

Answer 24

cilium with a gelatinous membranes with a rock inside. the rock is made up of calcium or silica. the rock floats until it his the cilium to that sends a nervous signal

Question 25

life cycle of aurelia

Answer 25

asexual reproduced, colony that is not polymorphic.
will incubate their young on the arms

Question 26

synapomorphy of class staurozoa?

Answer 26

star shaped
no medusa forms
octamere
tentacles at the end of their arms

Question 27

cubozoan morphology

Answer 27

boxed jelly.
tetramere symmetry
simple but have complex behavior and nervous system
eyes on their rhopalia for ocelli and imagine forming
velarium

Question 28

What are pedlia?

Answer 28

chattiness protective structures at the base of their tentacles. have the ability to prevent animals from eating thing inside the jelly fish

Question 29

reproduction of cubozoa?

Answer 29

have mating rituals where the male transfers spermatophores to the female that has nutrients and embryo. also includes nematocysts for protection but major for anchoring to the female so the sperm goes to the place. will grow polyps asexually but dominated by medusa