What is the blue dragon?
The blue dragon (Glaucus atlanticus) is an invertebrate that eats Portuguese men-of-war and absorbs their stinging cells.
What percentage of animal species do invertebrates account for?
Invertebrates account for over 95% of known animal species.
What are the two key features of invertebrate diversity?
Invertebrates occupy almost every habitat on Earth and exhibit significant morphological diversity.
How many known species are there in the Kingdom Animalia?
There are 1.3 million known species in the Kingdom Animalia.
What is the estimated total number of animal species, including undiscovered ones?
Estimates suggest there may be 10 to 20 million animal species.
What are Porifera and how many species do they have?
Porifera, or sponges, are sessile, filter feeders that lack true tissues, with about 5,500 species.
What are the key characteristics of Cnidarians?
Cnidarians are radially symmetrical, diploblastic animals with a gastrovascular cavity, including corals, jellies, and hydras.
How many species are classified under the phylum Cnidaria?
There are approximately 10,000 species classified under the phylum Cnidaria.
What does the group Lophotrochozoa include?
Lophotrochozoa includes phyla with diverse body plans such as flatworms, molluscs, and segmented worms.
What are the characteristics of Platyhelminthes?
Platyhelminthes are flatworms that have bilateral symmetry, a central nervous system, but lack a body cavity or circulatory organs.
How many species are there in the phylum Platyhelminthes?
There are about 20,000 species in the phylum Platyhelminthes.
What are some examples of organisms that belong to Platyhelminthes?
Examples include tapeworms, planarians, and flukes.
What is the habitat preference for most Annelida?
Most segmented worms in Annelida live in marine or freshwater habitats, while earthworms typically live in soil.
How many species are classified under the phylum Annelida?
There are approximately 16,500 species classified under the phylum Annelida.
What is the significance of the morphological diversity of invertebrates?
The morphological diversity of invertebrates helps them adapt to various environments and ecological niches.
What is a trochophore larval stage?
A trochophore is a type of larval stage found in some invertebrates, particularly in Lophotrochozoa.
What is a lophophore?
A lophophore is a specialized feeding structure found in some invertebrates, particularly in Lophotrochozoa.
What is the significance of invertebrates in ecosystems?
Invertebrates play crucial roles in ecosystems, including serving as pollinators, decomposers, and as part of the food web.
What is the primary feeding method of Porifera?
Porifera are filter feeders, meaning they feed by filtering small particles from the water.
What type of symmetry do Cnidarians exhibit?
Cnidarians exhibit radial symmetry.
What is the main body plan characteristic of flatworms?
Flatworms have bilateral symmetry.
What is the ecological role of earthworms in soil?
Earthworms aerate the soil and contribute to nutrient cycling.
What is the phylum that includes snails, clams, squids, and octopuses?
Mollusca
How many species are there in the phylum Mollusca?
100,000 species
What is a defining characteristic of molluscs?
They have a soft body, often protected by a hard shell.
What group includes more species than all other eukaryotic groups combined?
Ecdysozoa
How many species are there in the phylum Nematoda?
25,000 species
Where are nematodes (roundworms) commonly found?
In soil and aquatic habitats.
What is a notable feature of nematodes?
They are coated with a tough cuticle.
How many species are there in the phylum Arthropoda?
1,000,000 species
What are the main types of organisms included in the phylum Arthropoda?
Insects, crustaceans, and arachnids.
What is a characteristic of all arthropods?
They have a segmented exoskeleton with jointed appendages.
What does the group Deuterostomia include?
Both invertebrate and vertebrate species.
How many species are there in the phylum Hemichordata?
85 species.
What traits do hemichordates share with chordates?
What is the largest group within Hemichordata?
Acorn worms.
How many species are there in the phylum Chordata?
60,000 species.
What percentage of all chordates are vertebrates?
More than 90%.
What are the two groups of invertebrates in the phylum Chordata?
How many species are there in the phylum Echinodermata?
7,000 species.
What is a unique feature of echinoderms regarding symmetry?
They are bilaterally symmetrical as larvae but not as adults.
How do echinoderms move and feed?
By pumping water through a network of internal canals.
Name three examples of echinoderms.
What are sponges classified as in the animal kingdom?
Basal animals that lack tissues.
What is the scientific name for sponges?
Porifera.
How do sponges capture food?
They are filter feeders that capture particles suspended in water.
What is the central cavity of a sponge called?
The spongocoel.
What is the function of the osculum in sponges?
The osculum is the opening through which water flows out of the sponge.
What type of cells are choanocytes and what is their function?
Flagellated collar cells that engulf bacteria and food particles by phagocytosis.
What is the mesohyl in sponges?
A gelatinous region that separates the two layers of cells in a sponge.
What are amoebocytes and what roles do they play in sponges?
Totipotent cells that digest food, transport nutrients, and produce skeletal fibers.
What does 'totipotent' mean in the context of amoebocytes?
Ability to produce all body cells.
How do most sponges reproduce?
Most sponges are hermaphrodites, functioning as both male and female.
What is sequential hermaphroditism in sponges?
When an individual sponge functions first as one sex and then as the other.
What happens to sponge zygotes after fertilization?
Zygotes develop into flagellated, swimming larvae that eventually settle and develop into sessile adults.
What distinguishes eumetazoans from sponges?
Eumetazoans are animals with true tissues, while sponges lack tissue organization.
What is the oldest phylum in the clade of eumetazoans?
The oldest phylum is Cnidaria.
What types of organisms are included in the phylum Cnidaria?
Includes corals, hydras, and jellies (jellyfish).
What is the basic body plan of cnidarians?
A sac with a central digestive compartment called the gastrovascular cavity.
What is the blue dragon?
The blue dragon (Glaucus atlanticus) is an invertebrate that eats Portuguese men-of-war and absorbs their stinging cells.
What percentage of animal species do invertebrates account for?
Invertebrates account for over 95% of known animal species.
What are the two key features of invertebrate diversity?
Invertebrates occupy almost every habitat on Earth and exhibit significant morphological diversity.
How many known species are there in the Kingdom Animalia?
There are 1.3 million known species in the Kingdom Animalia.
What is the estimated total number of animal species, including undiscovered ones?
Estimates suggest there may be 10 to 20 million animal species.
What are Porifera and how many species do they have?
Porifera, or sponges, are sessile, filter feeders that lack true tissues, with about 5,500 species.
What are the key characteristics of Cnidarians?
Cnidarians are radially symmetrical, diploblastic animals with a gastrovascular cavity, including corals, jellies, and hydras.
How many species are classified under the phylum Cnidaria?
There are approximately 10,000 species classified under the phylum Cnidaria.
What does the group Lophotrochozoa include?
Lophotrochozoa includes phyla with diverse body plans such as flatworms, molluscs, and segmented worms.
What are the characteristics of Platyhelminthes?
Platyhelminthes are flatworms that have bilateral symmetry, a central nervous system, but lack a body cavity or circulatory organs.
How many species are there in the phylum Platyhelminthes?
There are about 20,000 species in the phylum Platyhelminthes.
What are some examples of organisms that belong to Platyhelminthes?
Examples include tapeworms, planarians, and flukes.
What is the habitat preference for most Annelida?
Most segmented worms in Annelida live in marine or freshwater habitats, while earthworms typically live in soil.
How many species are classified under the phylum Annelida?
There are approximately 16,500 species classified under the phylum Annelida.
What is the significance of the morphological diversity of invertebrates?
The morphological diversity of invertebrates helps them adapt to various environments and ecological niches.
What is a trochophore larval stage?
A trochophore is a type of larval stage found in some invertebrates, particularly in Lophotrochozoa.
What is a lophophore?
A lophophore is a specialized feeding structure found in some invertebrates, particularly in Lophotrochozoa.
What is the significance of invertebrates in ecosystems?
Invertebrates play crucial roles in ecosystems, including serving as pollinators, decomposers, and as part of the food web.
What is the primary feeding method of Porifera?
Porifera are filter feeders, meaning they feed by filtering small particles from the water.
What is the ecological role of earthworms in soil?
Earthworms aerate the soil and contribute to nutrient cycling.
What is a defining characteristic of molluscs?
They have a soft body, often protected by a hard shell.
What are the main types of organisms included in the phylum Arthropoda?
Insects, crustaceans, and arachnids.
What is a characteristic of all arthropods?
They have a segmented exoskeleton with jointed appendages.
What is a unique feature of echinoderms regarding symmetry?
They are bilaterally symmetrical as larvae but not as adults.
What is the function of the osculum in sponges?
The osculum is the opening through which water flows out of the sponge.
What type of cells are choanocytes and what is their function?
Flagellated collar cells that engulf bacteria and food particles by phagocytosis.
What is the mesohyl in sponges?
A gelatinous region that separates the two layers of cells in a sponge.
What are amoebocytes and what roles do they play in sponges?
Totipotent cells that digest food, transport nutrients, and produce skeletal fibers.
How do most sponges reproduce?
Most sponges are hermaphrodites, functioning as both male and female.
What is sequential hermaphroditism in sponges?
When an individual sponge functions first as one sex and then as the other.
What happens to sponge zygotes after fertilization?
Zygotes develop into flagellated, swimming larvae that eventually settle and develop into sessile adults.
What distinguishes eumetazoans from sponges?
Eumetazoans are animals with true tissues, while sponges lack tissue organization.
What types of organisms are included in the phylum Cnidaria?
Includes corals, hydras, and jellies (jellyfish).
What is the basic body plan of cnidarians?
A sac with a central digestive compartment called the gastrovascular cavity.
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