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Phylum Arthropoda !. By: Anna Grace Watkins. Arthropod Characteristics:. Arthropods pollinate many of the flowering plants on Earth. Arthropods are bilateral symmetrical. They have an exoskeleton and appendages.

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Phylum arthropoda

Phylum Arthropoda!

By: Anna Grace Watkins

Arthropod characteristics
Arthropod Characteristics:

  • Arthropods pollinate many of the flowering plants on Earth.

  • Arthropods are bilateral symmetrical.

  • They have an exoskeleton and appendages.

    • An appendage is any structure, such as a leg or an antenna, that grows out of the body of an animal.

    • They help the arthropod with its sensing, walking, feeding, and mating.

    • Some arthropods have a head and a fused thorax and abdomen, but others have an abdomen and a fused head and thorax called a cephalothorax.

Characteristics continued
Characteristics Continued:

  • Arthropods must shed their old exoskeleton often.

  • They are very successful due to the presence of an exoskeleton.

    • This process is called molting.

    • They go through this because their exoskeleton can not grow, but before it molts, a new, soft exoskeleton is formed from chitin-secreting cells beneath the old one.

    • But while the new exoskeleton is soft ,they become very venerable to predators because they can not protect their selves.

    • Most arthropods molt four to seven times in their lives.

Characteristics continued1
Characteristics Continued:

  • Most arthropods are segmented, but not as much as worms.

    • There are 3 sections:

      • Head

      • Thorax

      • Abdomen

Characteristics continued2
Characteristics Continued:

  • Arthropods are mostly very quick!

  • They crawl, run, climb, dig, swim, and fly.

  • They have an open circulatory system with vessels that carry blood away from their hearts.

  • Also has a complete digestive system with a mouth, stomach, intestine, and anus.

  • Arthropods also reproduce sexually.

  • They have a wide variety of respiratory structure .

    • Gills, book lungs, & tracheal tubes!

      • Other openings in their body is spiracles.

Characteristics continued3
Characteristics Continued:

  • Arthropods have acute senses.

  • Some can even communicate by pheromones, which are chemical odor signals given off by animals.

  • Their vision is also very important also.

  • Most have a pair of large compound eyes and from three to eight simple eyes.

  • Compound eyes can detect movements of prey, mates, or predators, and can also detect colors.

  • Arthropods also have well-developed nervous system that process information coming in from the sense organs.

  • Its simple nervous system consists of a double ventral nerve cord, an anterior brain, and several ganglia.

    • The ganglia acts as control centers for the body section in which they are located.

Class arachnida
Class Arachnida:

  • 30,000 Species!

  • But only a dozen a harmful to humans.

  • Spiders are the largest group of arachnids.

  • Arachnids have 6 pairs of jointed appendages.

  • The first pair of appendages are called chelicerae. (pinchers/fangs)

  • The second pair of appendages are called the pedipalps.

  • The remaining 4 appendages are modified as legs for locomotion.

  • No antennae!

  • Has structures called spinnerets where the spider silk is secreted and is spun into thread.

  • 2 body regions.

    • The Cephalorthorax

    • The Abdomen

Class arachnida pictures
Class Arachnida Pictures:



Class diplopoda
Class Diplopoda:

  • Millipedes eat mostly plants and dead material on damp forest floor.

  • They do not bite, but can spray bad smelling fluids from their defensive stink glands.

  • There are estimated 8,000 species.

  • Centipedes are found in an array of terrestrial habitats from tropical rainforests to deserts.

  • they are found in soil and leaf litter, under stones and deadwood, and inside logs.

Class crustacea
Class Crustacea:

  • Crustaceans are aquatic .

  • They exchange gas as water flows over feathery gills.

  • They are the only arthropods that have two pairs of antennae for sensing.

  • Some have 3 body sections & others only have 2.

  • Many have five pairs of walking legs that are used for:

    • Walking

    • Seizing prey

    • & cleaning other appendages

  • All have:

    • Mandibles for crushing food.

    • 2 compound eyes.

Class crustacea pictures
Class Crustacea Pictures:



Class chilopoda
Class Chilopoda:

  • Centipedes are carnivorous and eat soil arthropods, snails, slugs, and worms.

  • When they bite you its very painful to humans.

  • They have Malpighian tubules for excreting waste.

  • Millipedes have tracheal tubes!

  • They may have from 15 to 181 body segments.

    • But they always have an odd number of segments.

Class merostomata
Class Merostomata:

  • It includes only four living species.

  • These arthropods migrate to shallow water during mating season.

  • Female lay their eggs on land, buried in sand above the high water mark.

  • They possess compound eyes.

  • Also have a semicircular exoskeleton, and a long pointed tail.

  • They also have 4 pairs of walking legs.

  • 5 or 6 pairs of appendages that movie over their gills.

Class merostomata pictures
Class Merostomata Pictures:

Class insecta
Class Insecta:

  • Class Insecta is by far the largest group of arthropods.

  • Insects mate more than once, or less during their lifetimes.

  • The eggs are fertilizes internally and in some species, shells form around them.

  • Most lay a large number of eggs.

  • Females are equipped with an appendage that allows the insect to pierce through the ground or wood service to lay its eggs in the hole.

  • Some insects go through complete metamorphosis, where the insect goes through a series of developmental changes from egg to nymph.

    • Egg

    • Larvae

    • Pupa

    • Adult

  • Others go through incomplete metamorphosis , where the insect goes through only three stages of development.

    • Egg

    • Nymph

    • Adult

Class insecta pictures
Class Insecta Pictures: