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Transcript of INSECTS
Insects started as soft - bodied. First was a worm-like and like modern day marine annelds. Through centurys they developed exoskeletons and later developed wings. Phylum: Arthropoda
There are four classes to this phylum. Insects are in the
class Insecta. The class Insecta is sub-divided into 29
different orders. There are about one million species in
this class alone. arthro = joint poda = foot
Arthropods are "joint-limbed" invertebrates with a hardened cuticle, a condition believed to have evovled independently on several occasions. The group Insecta is restricted to include only "true" arthropods. This includes things with exoskeletons and joint appendages. Insects are found all over the world. The specices varies on the location, but there are many more insects on land than in water. parts - foregut, midgut, hindgut, rectum, malpighian tubule.
Insects eat; fruit, leaves, grass, dirt, other insects, etc. Insects have an exoskeleton, which is, external covering that encloses the muscles and organs. Charatceristics of this are; it's hard, jointed, covers the intire outside of the organism. The nervous system contains a brain and a sub-esophagal ganglion, each formed from fusion. Fusion probably allows incoming information and may economize on the number of nerve cells required. Insects don't have veins or arteries, they have an open circulatory system. A single vessel runs from the head to abdomen. The vessel divides into two chambers and functions, making the heart. Flight extended the insects range of areas it is able to live, they are able to get to otherwise inaccessible habitats. Insects get great speed and maneuverability. Jointed appendages help them grip into things and hold them. Their reproductive system has a similar structure to those of vertebrates. Males produce sperm and females produce eggs. They are haploid and unicellular. Most reproduce sexually, yet some reproduce by parthenogenesis (growth and developement in an unfertilized egg.) Insects have a tracheal system, which is a system of internal tubes and sacs of oxygen is then delievered directly to needed areas. This is good for aquatic environments and allows them to depend on dissolved oxygen through the use of gills or to acquire it at the water surface, allowing them to exploit anaerobic habitats. 1. Tarantual wasps paralyze tarantual and lay a single egg on the still living spider; when the egg hatches, the wasp larva has fresh food. 2. Butterflies and moths are found on all land masses except Antarctica. 3. The Anopheles mosquito is the deadliest insect. It carries many blood borne diseases; including Malaria, which is responsible for millions of deaths a year. 4. Dragonflies are among the fiercest carnivorus insects. 5. The Phyllium Giganteum is the largest leaf insect. video : http://www.desertusa.com/video_pages/thawk1.html