Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
14 Cards in this Set
- Front
- Back
|
List the 3 key body plan characteristics that all arthropods share.
|
Bilaterally symmetrical
Flexible, jointed appendages Exoskeleton (provides protection, support, flexibility, and increased surface area for muscle attatchment) |
|
|
How do arthropods grow?
|
In order to grow arthropods most molt, or shed their exoskeleton. A new shell develops under the old one prior to molting, then hardens after the old skeleton is discarded, the animal then takes in water to expand itself. For lobsters limb generation also happens during molting.
|
|
|
What do female decapods (crabs, lobsters, etc) do with their eggs?
|
The females carry their eggs using pleopods, specialized appendages beneath the body.
|
|
|
Do crustaceans broadcast or internally fertilize eggs?
|
Crustaceans usually have separate sexes, and use direct fertilization where the males use specialized appendages to transfer sperm directly to the female. They mate after the female molts, and the pleopods/ swimmerettes carry the eggs.
|
|
|
What type of larvae do crustaceans usually have?
|
Crustaceans usually have planktonic larvae (does not look like an adult)- Zoea and Nauplius
|
|
|
What two features enhance crustacean eye-sight?
|
- Compound eyes (often at the end of stalk)
- Statocysts (balance) |
|
|
Crustaceans have complex behaviors. List one way in which they can communicate with each other or other species.
|
- They have body posture and complex movement of their antennae and legs. They communicate through sound.
|
|
|
Statocyst:
|
A small organ of balance and orientation in some water invertebrates, consisting of a sensory vesicle or cell containing statoliths.
|
|
|
Maxillipeds:
|
Appendages closer to the month, turned forward and specialized to sort out food and push it towards the mouth. They are used as filtering devices in decapods that eat small food particles. (“mouth feet” –legs modified as mouth parts)
|
|
|
Explain how barnacles feed
|
Barnacles have hair bristles on some appendages that are used to catch food particles in the water. These particles are carried to the bristles by currents induced by the beating of other appendages. Specialized appendages move food from the bristles to the mouth.
|
|
|
Class Merostomata (horseshoe crabs)
|
Horseshoe shaped carapace (upper hard shell)
Five pairs of legs Emerge on beaches to reproduce |
|
|
Class Pycnogonida (sea spiders)
|
4 or more pairs of legs
Small body Large proboscis with mouth at tip used to feed on soft invertebrates (sea anemones/hydrozoans) Feed on cnidarias |
|
|
Class Insecta
|
3 pairs of legs
Most diverse group of animals on Earth Intertidal scavengers for seaweeds barnacles and rocks |
|
|
Insects are very abundant on land, but extremely limited in the ocean. List two marine environments where insects can be found.
|
Water’s Edge
They also like to scavenge among seaweeds, barnacles, and rocks. |
