insects

A. Centipedes

1. Class Chilopoda 2. Move quickly and live in moist places 3. Long segmented bodies and each segmented has a pair of joined legs a. The first pair of appendages are is modified to form poison claws to kill prey

B. Millipedes

1. Class Diplopoda 2. 2 pairs of appendages in their abdominal segments and one pair on their thorax segments 3. Herbivores and live under logs or stones 4. Walk with slow graceful motion 5. No poison claws

D. Wings

1. Insects are the only invertebrates that can fly 2. Their wings are outgrowths of the body wall 3. THey are formed of a thin double membrane of chitin 4. THey have rigid veins in them that give them strength 5. Butterfly and moth winds are coved in scales, which may be used to attract males 6. To fly, they forward thrust, upward lift, balance and steer 7. Most rotate wings in a figure 8 pattern

C. Mouthparts

1. Insects mouths are adapted to the food they eat

H. Insects and Humans

1. Most insect species arent harmful to humans a. They pollinate most flowering plants b. They produce honey and silk 2. They can be harmful though a. SOme are parasites and transmit disease b. They also destroy crops c. They keep this damage in check by using chemicals 1. But this disrupted food chains 2. SO they use intergrated pest management, which doesn't involve chemicals

G. Insect Socities

1. Some insects organize into social groups and cooperate in activities necessary for their survial 2. For example a hive a. There are 3 castes in a hive 1. A caste is a group of individuals within a society that perform specific tasks 2. Workers are females that dont reproduce 3. Drones are reproductive males 4. The queen is the only reproductive female 5. Ants have a similar system

E. Sense Organs

1. They have hairlike stuctures that are senseitive to touch, pressure, vibration, and odor 2. Also can detect airflow with hairs that cover body 3. Some detect airborn sounds with tympanic organs, while other detect vibrations coming from ground a. These sensory cells are located on legs 4. Chemical senses a. CHemical receptors are can detect taste and small and are located on mouthparts, antennae, or legs b. Chemical signals in the form of pheromoes enable insects to communicate with one another to attract mates or to gather members into large colonies to migrate

F. Metamorphosis

1. They may not care for young but they do lay eggs in a specific place where they will survive 2. After hatching, they undergo this process, a series of major changes from the larval form to an adult form

how many dif types of metamorphosis are there

2

% insects

80 % of arthropods are this

II. External Features

A. HTey have head, thorax, and abdomen 1. Head structures include antennae, compund eyes, simple eyes, and mouthparts B. They have 3 pairs of legs and generally 2 pairs of wings on the thorax 1. THough some only have one pair of wings or none

III. Insect Adaptations

A. Their adaptations enable them to ultilize all kinds of food, amking them parasites, predators, or plant-sap suckers, and to live in many different types of enviroments B. Legs

15. THe compund eyes of insects

Are made of many lenses

can live

B. Can find in soil, forests, deserts, mountaintops, and polar regions 1. Can live in many habitats because of their ability to fly and adapt 2. Their small size allows them to be moved easily 3. Hard exoskeletons prevent them from being dried out 4. Reproduction can occur anywhere

general

C. Short life cycles and reproduce in masses

36. Refer to the illustration above. The life cycle shown is an example of

Comlpete metamorphosis

12. The easiest way to tell whether an arthropod is an insect or spider is to

Count its legs

11. Which insect in not classified in the same order aaaas the others?

Crickets

43.. Nillipedes feed mainly on

Decayed plants

34. Most insects

Have two wings and three pairs of legs

8. The body of an insect is divided into a

Head, thorax, and an abdomen

21. THe exoskeleton of an insect

May be modified into large pinchers

35. In complete metamorphosis, the young insect hatches from the egg as a

Nymph

14. HOw many pairs of legs are there on most body segments of a centipede?

One

42. The name millipede means

Thousand feet

16. Which appendages are found in insects but not in arachnids?

Wings

house fly mouth

a fleshy end of mouthpart acts like a sponge to mop up food

what is a caste

a group of individual insects who do specific jobs to contribute to their caste system

mosquito mouth

a thin needle like tube that pierces the skin or pllant walls to suck liquids into the mouth

Complete metamorphosis

a. 4 stages: egg, larva, pupa, and adult 1. In the larval stage, or caterpillar, the larva usually has chewing mouthparts and behaves like a feeding machine. It then molts several times 2. A pupa is a nonfeeding stafe of metamorphosis in which the animal changes form from larval form to adult form. 3. In adult stage, it is they disperse and reproduve, If adults feed, they dont use the same food source as the larvae

3. Communication Methods

a. Bees use body movements to indicate the location of food ources 1. For example, the waggle dance.

4. Incomplete metamorphosis

a. They hatch from eggs as nymphs 1. These are the immature form of insects that look like small adults without fully developed wings 2. Over months they grow into adult

insect mouthparts are

adapted to the food they eat

what type of circulatory system is present in insects

an open circ

in maamls and birds the wing is a modified __________ while in insects it is an outgrowth of the +__________

appendage exoskeleton

give an ecample of an insect that has a caste system

bees

what term is given to the chemical receptors that some insects possess that allow them to taste and to smell. Theses receptors are located on the mouthpards, antennae, or legs

chemoreceptors

which type included egg, larva, pupa and adult

complete

what is metamorphosis

the changes an insect undergoes from birth to adult form

what are malpighian tubules

those are tubles that run throughout the insect and excrete excess water. theyre part of the excretory systen

the insect is the only arthropod with these structures

wings