Lesson 21 Lecture notes Flashcards
Animals in Phylum Cnidaria get their name from their cnidocytes which are…
stinging cells
Cnidarians all have 2 germ layers which together make up their…
Epithelial cells- nerve cells and contractile cells
A cnidarian that is sessile, cup-shaped, has a mouth and tentacles at one end, and a sticky base that attaches to a hard surface on the other end is called…
Polyp
A cnidarian that is motile with an umbrella-shaped body with its mouth facing downward and tentacles extending around it is called…
Medusa
Hydra are part of which class of cnidarians?
Hydrozoa
Hydra are part of which class of cnidarians?
Hydrozoa
Jellyfish are part of which class of cnidarians?
Scyphozoa
Coral are part of which class of cnidarians?
Anthozoa
Echinoderm means…
Spiny skin
Sea stars are part of which class of echinoderms?
Asteroidea
Brittle stars are part of which class of echinoderms?
Ophiuroidea
Sand dollars are part of which class of echinoderms?
Echinoidea
Sea cucumbers are part of which class of echinoderms?
Holothuroidea
Echinoderms do NOT have which of the following systems?
a. Respiratory system
b. Water vascular system
c. Digestive system
d. Circulatory system
a. Respiratory system
Echinoderms use _______ for capturing prey, eating, and movement.
tube feet
_______ is only found in animals or organisms in Phylum Echinodermata.
Water vascular system
Phylum Cnidaria all have
soft bodies that exhibit radial symmetry
Nerve cells
Nerve cells sense outside stimulus and coordinate the animal’s response
Contractile cells
bend the organism’s body allowing it to move through the water.
Phylum cnidaria have two…
body forms- polyp and medusa
Which is sessile and which is motile?
- Polyp
- Medusa
- Polyps - sessile
2. Medusa - Motile
The Cnidaria have stinging cells on their tentacles called…
cnidocytes
Cnidaria have a digestive system with
one opening
Cnidaria have what kind of respiratory and circulatory systems?
None
Jellyfish reproduce using —–
alternation of generations
how do sea anemones release their nematocysts?
chemical recognition
Hydra reproduce
asexually via budding, sexually gametes released into the water
Phylum echinoderms have
(Star fish, shellfish)
water vascular systems and tube feet
Echinodermata (sea stars, sea urchins) have endoskeletons made of
plates called ossicles
Echinodermata have what sort of circulatory system?
closed
Echinodermata have reproduction via
external fertilization
what makes sea cucumbers unique?
they have leathery skin
