phylum arthropod
DESCRIPTION
PHYLUM ARTHROPOD. BY: ARIANA MEJIA. CHARACTERISTICS. Segmented body plan Exoskeleton Has an open circulatory system Nervous system has a dorsal brain and a ventral nerve chord Bilateral symmetry Sexual reproduction. Class Insecta. - PowerPoint PPT PresentationTRANSCRIPT
PHYLUM ARTHROPOD
BY: ARIANA MEJIA
CHARACTERISTICS Segmented body plan Exoskeleton Has an open circulatory system Nervous system has a dorsal brain and a
ventral nerve chord Bilateral symmetry Sexual reproduction
Class Insecta It is the largest group in the animal kingdom with 29
orders and 800,000 known species Insects are in the subphylum Tracheata because they
breathe through a trachea All insects have an exoskeleton, that sheds periodically Mouth parts are perfected for licking, piercing, crushing or
sucking. Insects have three body sections, known as the head,
thorax, and the abdomen They are the most successful forms of life on earth Normally they are very small, but normally the largest
insect is the size of a human hand
INSECTS!!!!!
Class Crustacea
About 30,000 species of this class Most are marine but some live in fresh water This includes lobsters, crabs, crayfish,
shrimp, and several other organisms Most are free-living, but some are sessile
and a few are parasitic. The legs include specialized chelipeds, and
may be used to capture prey. They breathe through gills Like other arthropods, this class has an
exoskeleton
CRUSTACEANS!!!!!!!!!
Class Arachnida Includes a very diverse group of arthropods: spiders, scorpions, ticks, mites,
harvestmen, and their cousins. There are 75,000 different species and most of them are spiders Most arachnids are carnivorous, mostly feeding on insects Arachnids provide an important service, keeping insect population under
control Order Araneae (spiders) : No antennae Abdomen joined to cephlothorax by slender pedicel. They have four parts of legs Order Acari (mites and ticks): No antennae Abdomen joined by cephlathorax (no pedicel) Order Scorpiones (scorpions): No antennae 4 pairs of legs on cephlathorax Scorpions mostly feed on insects and spiders
ARACHNIDS!!
CLASS CHILOPODA They are the centipedes Their bodies are made up of a chain of many flattened
segments. Centipedes feed on soil invertebrates All centipedes are terrestrial Range in size from a few millimeters to about 30 cm 8,000 species Some centipedes can be hazardous to humans because of their
venomous bites. Smaller centipedes normally do not puncture humans.
CHILOPODA!!
CLASS DIPLOPODA• The millipedes • They also have bodies made up of numerous segments.• Millipedes lack poisonous fangs, and do not bite.• But to discourage predators they will roll into a ball and
release foul smelling substances.• 10,000 species• Female millipedes lay eggs in nests• Two pairs of legs per segment• They eat decaying leaves and other dead plant matter.• Common millipedes have around 40-750 legs
MILLIPEDES
CLASS MEROSTOMATA
Marine class of horseshoe crabs and eurypterids.
Only 4 species Have a large shield that covers the
cephalothorax. Compound eyes are reduced
HORSESHOE CRABS