Invertebrataes
True or False
Invertebrates are the most diverse and numerous group in the animal kingdom
True
What type of invertebrate an irregular or tube like shaped and is fixed to a substrate and is fed by filtering the water
Porifera
What characteristics do these three groups of invertebrates have?
Sofe and elongated body, head in which sensory and nervous orgrans are located and bilateral symmetry
What are molluscs?
Soft bodied invertebrates that can be both aquatic and terrestrial, most of them develop a protective skeleton which can be external or internal
What are arthropods
Are invertebrates heterotrophic or autotrophic organisms?
Heterotrophic
Jellyfish, corals and anemones belong to this group
Cnidaria
What are platyhelminthes?
Flat bodied aquatic and terrestrial invertebrates - some are free living and others are parasites
What are the three parts of a molluscs body?
Visceral Mass - body and protects the internal organs
Muscular Foot - how they move
What are echinoderms
Invertebrate animals that have radial symmetry, they live on the seabed and move thanks to the ambulacral system
Invertebrates are ___cellular organisms composed of _____ ______ cells and have no ______.
Multicellular
Animal Eukaryotic Cells
Vertebral column or spine
What is a choanocyte?
Cells with flagella that when moving generate a current of water that enters through the pores and exit through the upper opening
What is a parasite?
An organism that lives and feeds inside other organisms
What are the three main groups of molluscs
Gastropods, bivalves, and cephalopods
What characteristics do most arthropods share?
Articulated appendages that perfrom direct functions (ex: legs)
Eyes, also known as ocelli
HArd and continuous exoskeleton that needs to be shed
What are the the types of symetry invertebrates can have?
Bilateral (example beetle)
Radial (example sea urchin)
Asymmetry (sponge)
Explain the important body parts of porifera
Osculum - upper opening of the body
Spongocoel - central cavity of the organism
Pores - small holes that cover the wall of the sponge and communicate with each other
What are annelids
Worms with an elongated body that is divided into segments or rings, have cutaneous respiration and must live in terrestrial and moist environments or aquatic environments
Explain bivalves
What characteritics do echinoderms share?
Endoskeleton is covered by a skin layer
Carnivore and breathe through gills
Sexual reproduction (some asexual through fragmentation)
Move thanks to ambulacral system
Body not segmented and can have different shapes
What are the types of invertebrates?
Porifera Cnidaria Annelids Molluscs Arthropods
Echinoderms
Explain the difference between polyps and jellyfish
Polyps - live anchored to the substrate, sac shaped body, have tentacles to capture food, corals anemones and hydras, reproduce asexually
Jellyfish - aquatic and move free, gelatinous body, inverted sac shaped body, move by propelling with tenticles or sea curent, reproduce sexually
What are the hard hairs on the rings of annelids that help them move around?
Chaetae
What are the parts of a cephalopod's body?
Internal skeleton - pen
Gills
Muscle foot - move and catch prey
Explain and name mandibulate arthropods
Have a set of jaws around their mouths
Crustaceans, myriapods and insects