Characteristics of the Invertebrate Animals
Where can you find Invertebrate Animals?
In water (aquatic) or on land (terrestrial).
What habitat do Porifera and Cnidaria have?
Mostly marine.
What is the common word for "Annelids"?
BONUS 200: Give 2 examples of Annelids.
Worms
BONUS:
Leech, Marine worm, Earthworm
What are the 3 types of molluscs you must know?
BONUS 200: Give 1 example of each.
Gastropods: snails, marine snails, slugs
Bivalves: clames, mussels and cockles
Cephalopods: cuttlefish, octopuses, and squids
Name three things all Arthropods have in common.
Bilateral symmetry, Segmented body (head, thorax, abdomen), Exoskeleton made of chitin renewed by moulting (muda), and articulated appendages for mobility and sensitivity.
What size can Invertebrate Animals be?
They can be microscopic or giant.
Name one example of a Porifera and one example of a Cnidaria.
BONUS 200: Name all three examples of Cnidaria.
Porifera: sponges
Cnidaria: corals, anemones, and jellyfish
What is common about the nutrition and lifestyle of the Platyhelminthes and Nematodes?
Most are deposit feeders (feed on particles from the soil), but some are parasites.
How do gastropods touch, smell and see?
They have two sets of tentacles on their head: one pair for touch and smell, two with eyes.
What is the difference between a centipede and a millipede?
Centipede: one pair of legs per segment
Millipede: two pairs of legs per segment
What makes Invertebrate Animals different from other animals?
They do not have a spinal column (backbone).
What is the nutrition of Porifera and what is the nutrition of Cnidaria?
Porifera: filter feeders (they feed on particles obtained when they filter water).
Cnidaria: carnivorous predators (they paralyse prey with the stinging tentacles and digest it with gastrovascular activity).
What are the different habitats for Annelids? Be specific about which Annelids live where.
The sea (marine worms), fresh water and soil (earthworms) and parasites (leeches).
Describe the movement of Gastropods, Bivalves, and Cephalopods.
Gastropods: they use the muscular foot, where they also have the stomach.
Bivalves: sessile. They live attached to the rocks and seafloor.
Cephalopods: They swim actively.
What are the 3 types of Arthropods you must know?
BONUS 200: Give 1 example of each type.
Myriapods: centipedes and millipedes
Arachnids: spiders, scorpions, ticks, harvestmen
Crustaceans: crabs, shrimps, barnacles
Insects: butterfly, beetle, mosquito, bee
TRUE OR FALSE: Some Invertebrate Animals are motile and some are sessile.
True.
What are the movements of Porifera and Cnidaria?
Porifera: sessile
Cnidaria: corals and anemones are sessile; jellyfish are motile.
Describe the movement of Annelids.
BONUS 200: What is the name of the structure SOME Annelids use?
They have no legs, but some use rigid, hair-like structures (BONUS: setae).
Which molluscs have shells? Be specific with the cephalopods.
BONUS 100: What allows the Bivalves to open and close?
Gastropods: a spiral shell they can fit their entire body in.
Bivalves: Bivalve shell (BONUS: They can open and close it with muscles).
Cephalopods: Internal shell (squids and cuttlefish), External shell (nautilus), No shell (octopuses).
Describe the three regions of a body of an insect and what each part is for.
Head: sensory antennae, adapted mouth and compound eyes
Thorax: three pairs of articulated legs and sometimes wings.
Abdomen: segmented and without appenages.
What are the three types of "skeletons" an Invertebrate Animal can have?
Invertebrate Animals can have exoskeleton, endoskeleton or no skeleton.
Explain the body/structure of the Cnidaria. Hint: There are two different bodies/structures.
BONUS 500: Explain the body/structure of the Porifera.
Body of a coral: radial symmetry
Structure of Cnidaria: stinging tentacles and gastrovascular cavity (stomach + mouth)
BONUS: Body of a Porifera: no symmetry, sack-shaped. They have a body covered in pores and a big hole (osculum) to filter water. Its internal skeleton is made of hard, flexible spikes.
Describe the bodies of Platyhelminthes, Nematodes and Annelids.
Platyhelminthes: bilateral symmetry. Long, soft, FLAT body
Nematodes: bilateral symmetry. Long, soft, CYLINDRICAL body
Annelids: bilateral symmetry. Long, soft body divided into rings (metameres)
What 3 characteristics are shared by all molluscs
BONUS 500: What are the names for the parts of the body AND what do each part contain?
Bilateral symmetry, body organized into three parts, most are aquatic and those which are terrestrial need humid environments.
BONUS:
Head: with the sensory organs
Visceral mass: the main body with internal organs. It includes a mantle, a thin membrane that covers the mass and generates the shell, that can be internal or external.
Foot/feet: it is muscular and very different depending on the type of mollusc.
What are the names of the two regions of the body in crustaceans and what are they made of?
BONUS 300: Describe the appendages.
Cephalothorax: head and thorax fused
Abdomen: thin and flexible segments, tail fins (telson)
BONUS: Appendages: two pairs of antennae (sensitivity), two eyes and chewing mandibles. Five pairs of legs.