Podcast
Questions and Answers
What is a defining characteristic of annelids?
What is a defining characteristic of annelids?
- They lack a coelom.
- They exhibit homonomous segmentation. (correct)
- They possess an open circulatory system.
- They are exclusively aquatic.
Which respiratory structure is primarily associated with the Polychaeta class?
Which respiratory structure is primarily associated with the Polychaeta class?
- Gills located in the coelomic cavity.
- Skin diffusion only.
- Lungs similar to terrestrial animals.
- Gills located on parapodia. (correct)
What is the function of the clitellum in oligochaetes?
What is the function of the clitellum in oligochaetes?
- It acts as a feeding organ.
- It serves as a reproductive structure. (correct)
- It aids in locomotion through water.
- It supports gas exchange.
What type of development do marine Polychaeta typically undergo?
What type of development do marine Polychaeta typically undergo?
In which environment do oligocheates predominantly live?
In which environment do oligocheates predominantly live?
Which of the following is NOT a feature of annelids?
Which of the following is NOT a feature of annelids?
What type of animals belong to the class Hirudinea?
What type of animals belong to the class Hirudinea?
What is a common method of reproduction for annelids?
What is a common method of reproduction for annelids?
Flashcards
Annelids
Annelids
A group of segmented animals with a well-developed coelom, commonly found in marine, freshwater, and soil environments.
Homonomous Segmentation
Homonomous Segmentation
External segments on an annelid's body that correspond to internal segments, providing a uniform structure.
Parapodia
Parapodia
Projections on an annelid's body resembling limbs, typically found in marine species.
Setae
Setae
Signup and view all the flashcards
Polychaeta (Polychaetes)
Polychaeta (Polychaetes)
Signup and view all the flashcards
Oligochaeta (Oligochaetes)
Oligochaeta (Oligochaetes)
Signup and view all the flashcards
Clitellum
Clitellum
Signup and view all the flashcards
Hirudinea (Leeches)
Hirudinea (Leeches)
Signup and view all the flashcards
Study Notes
Annelids (Annelida)
- Segmented, bilaterally symmetrical, triploblastic animals with a well-developed coelom
- Live in seas, fresh water, and soil
- Important for soil humus production
- Homonomous segmentation (external segments correspond to internal segments)
- May have parapodia (limb-like projections) or setae (bristles)
- Many species have shells
- Possess a closed circulatory system with dorsal and ventral vessels
- Unsegmented gut runs from mouth to anus
- Gills or body surfaces for respiration
- Metanephridia for excretion
- Ganglia form a "ladder-like" nervous system
- Reproduction: mostly gonochoristic; some hermaphrodites; internal or external fertilization; direct development in terrestrial and freshwater species
- Clitellum: swelling near the head where gonads are located
Class: Polychaeta (Polychaetes)
- Primarily marine
- Parapodia with setae and gills
- Gills for respiration
- Indirect development (trochophore larva)
- Some species have shells
- Carnivorous or detrivorous
- Example: Palolo worm (Palola viridis)
Class: Oligochaeta (Oligochaetes)
- Segmented body with setae on each segment
- Clitellum present
- Breathe through entire body surface
- Mostly live in soil and fresh water
- Important for soil (decomposers)
- Example: Earthworm (Lumbricus terrestris), Tubifex tubifex (Sludge worm)
Class: Hirudinea (Leeches)
- Fresh water species
- External segmentation does not correspond to internal organs
- Carnivorous or ectoparasites (bloodsuckers)
- Suckers at both ends of the body
- Gut has lateral projections for storing food (blood)
- Medicinal leeches inject anticoagulants and anesthetics into hosts
- Example: Medicinal leech (Hirudo medicinalis), Fish leech (Piscicola geometra/pijavička rybia), Horse leech (Haemopis sanguisuga/pijavica konská)
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
