Biology Lecture 15
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What are 4 key features of the animal body?
- symmetry of the body
- structure of the body
- segmentation of the body
- external appendages
What is symetry?
The overall shape of the animal
What does symetry shape allow?
division by at least one plane into similar halves
in echinoderms larvae have bilateral simetry while adults have...?
What are the 3 main structures of the body cavity?
what does the acoelomate body cavity structure have?
No body cavity
what does the pseudocoelomate body cavity structure have?
The internal organs float within the body cavity
what does the coelomate body cavity structure have?
Internal organd and coelom are lined with mesoderm tissue
What is the importance of segmentation? (4 things)
- Allows animals to alter body shape
- More precise control of movement
- Not always apparent externally
- Segmentation may vary in different regions of the body
name 3 different appendages and what they do
- Legs - increase precision and efficiency in mobility
- Antennae - sensory apendages
- Cilia - steering in ocean currents
Name and animal which evolved and lost the apendages?
Skink (lizard with legs) to a legless lizard
Name different eating habits to do with mobility and what they are.
- Motile animals - move to find food
- Sessile animals - capture food by filter feeding or via endosymbionts
What are filter feeders?
- Small organisms and molecules move through water column and air
- Animals collet these resources via filtering either passively or actively
What are predators?
- Eat living animals or animal tissue
- Generally prey are smaller in body size than predators but not always
What are pathogens?
What are parasites?
An organism that lives in or on another organism (its host) and benefits by deriving nutrients at the host's expense.
What are parasitoids?
An insect (e.g., the ichneumon wasp) whose larvae live as parasites that eventually kill their hosts (typically other insects)
What are detritivores? Give examples of what they eat
- They eat dead stuff
- such as plant material, animals (scavengers) and dung
What are omnivores?
eat both meat and veggetables
What two stages of the life cycle are specialized for different activities?
- Larva - immature stage that is dramatically different in form than adult
- One of these stages is specialized normally for despersal
Which group can marine animals be grouped by?
Larval form - they serve dispersal functions
Go through the estuarine trematode life cycle
- - first they go to a snail remove reproductive area and use for next stage
- - next gets eaten by a fish
- - goes to the brain and covers it to control behavior
- - causes abnormal behavior which attracts a bird to eat it
- - uses the bird to lay eggs
How has the gila monster adapted to arid environments?
- Thermal biology
- Water conservation
What would you like to do?
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