Podcast
Questions and Answers
What is a 'radula'?
What is a 'radula'?
Several molluscs have this teeth-bearing tongue-like structure that is used for feeding.
What is the 'foot' in mollusks?
What is the 'foot' in mollusks?
This mollusk's body region can be adapted for locomotion, attachment, or capturing food.
Mollusks' shells are secreted by which structure?
Mollusks' shells are secreted by which structure?
The mantle.
What is the process that snails undergo due to different rates of cell division?
What is the process that snails undergo due to different rates of cell division?
What pigment is found in mollusk blood instead of hemoglobin?
What pigment is found in mollusk blood instead of hemoglobin?
How many hearts do squid have?
How many hearts do squid have?
To which class do snails, slugs, and nudibranchs belong?
To which class do snails, slugs, and nudibranchs belong?
Which bivalve mollusks can swim by quickly closing their shells?
Which bivalve mollusks can swim by quickly closing their shells?
Which cephalopod does not have a shell?
Which cephalopod does not have a shell?
In which group do embryonic cell fates remain fixed?
In which group do embryonic cell fates remain fixed?
What does the name 'arthropoda' mean?
What does the name 'arthropoda' mean?
What substance composes the exoskeleton of arthropods?
What substance composes the exoskeleton of arthropods?
What are fused body regions in arthropods called?
What are fused body regions in arthropods called?
Crustaceans have _________ appendages that have 2 branches.
Crustaceans have _________ appendages that have 2 branches.
Which structure do female grasshoppers use to dig holes and lay eggs?
Which structure do female grasshoppers use to dig holes and lay eggs?
Which structure on grasshoppers' abdomen is used for sound reception?
Which structure on grasshoppers' abdomen is used for sound reception?
What covers the cephalothorax of crustaceans like lobsters?
What covers the cephalothorax of crustaceans like lobsters?
What structure in crayfish excretes metabolic waste?
What structure in crayfish excretes metabolic waste?
To which subphylum do spiders, scorpions, ticks, and mites belong?
To which subphylum do spiders, scorpions, ticks, and mites belong?
How many pairs of walking legs do members of the order decapoda have?
How many pairs of walking legs do members of the order decapoda have?
Which arthropods act as parasites that can carry diseases like Lyme disease?
Which arthropods act as parasites that can carry diseases like Lyme disease?
What is the most successful class of animals on earth by species count?
What is the most successful class of animals on earth by species count?
What are spiders' first pair of appendages called?
What are spiders' first pair of appendages called?
To which order do grasshoppers belong?
To which order do grasshoppers belong?
What is the long unsegmented tail of horseshoe crabs called?
What is the long unsegmented tail of horseshoe crabs called?
What type of symmetry do echinoderms exhibit as adults?
What type of symmetry do echinoderms exhibit as adults?
What structure in sea stars is responsible for movement?
What structure in sea stars is responsible for movement?
What part of a sea star's digestive system allows them to digest food outside of their body?
What part of a sea star's digestive system allows them to digest food outside of their body?
What system in sea stars circulates water through canals and rings?
What system in sea stars circulates water through canals and rings?
To which class do sea daisies belong?
To which class do sea daisies belong?
Study Notes
Radula and Mollusks
- Radula: A teeth-bearing, tongue-like structure used for feeding in several mollusks.
- Foot: Adaptable body region in mollusks for locomotion, attachment, and capturing food.
- Shells: Secreted by the mantle, which is a significant tissue layer in mollusks.
- Hemocyanin: A blue respiratory pigment found in mollusks’ hemolymph, replacing red hemoglobin.
Mollusk Anatomy and Circulatory System
- Squid possess three hearts and have a closed circulatory system.
- Gastropoda: The class of mollusks that includes snails, slugs, and nudibranchs.
- Scallops: Bivalves capable of swimming by rapidly closing their shells.
- Octopus: A cephalopod known for lacking a shell.
Developmental Biology
- In protostomes, the fate of embryonic cells is predetermined.
Arthropods: General Characteristics
- Arthropoda means "joint-footed," referring to their segmented appendages.
- Exoskeletons of arthropods are composed of chitin.
- Body regions in arthropods are fused into structures called tagmata.
Crustacean Specifics
- Crustaceans have biramous appendages, which serve dual functions: gills and walking legs.
- Female grasshoppers use an ovipositor to dig holes for egg-laying.
- Grasshoppers’ tympanum is a sound reception structure on the abdomen.
- Lobsters and crayfish have a hard protective covering called a carapace over the cephalothorax.
- Crayfish excrete metabolic waste using green glands.
Arachnids and Insects
- Chelicerata is the subphylum that includes spiders, scorpions, ticks, and mites.
- Decapoda members have five pairs of walking legs.
- Ticks are parasite arthropods that can transmit diseases such as Lyme disease.
- Insecta: The most diverse animal class, containing the highest number of species.
- Spiders have chelicerae, the modified fangs that are their first pair of appendages.
Grasshoppers and Horseshoe Crabs
- Grasshoppers belong to the order Orthoptera.
- Horseshoe crabs possess a long unsegmented tail known as a telson.
Echinoderms and Sea Stars
- Echinoderms exhibit radial symmetry as adults.
- Tube feet are responsible for movement in sea stars.
- Sea stars digest food externally using the cardiac stomach.
- The water vascular system circulates water through canals and rings in sea stars.
- Sea daisies fall within the class Concentricycloidea.
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Description
Test your knowledge of mollusk anatomy, including structures like the radula and mantle. This quiz covers important terminology and concepts related to the biology and behavior of these fascinating creatures. Perfect for biology students and enthusiasts alike.
