ARTHROPODS “Jointed-legs”. ARTHROPODS Chitinous exoskeleton Paired of jointed appendages Growth accompanied by ecdysis or molting Open circulatory system.

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Presentation transcript:

ARTHROPODS “Jointed-legs”

ARTHROPODS Chitinous exoskeleton Paired of jointed appendages Growth accompanied by ecdysis or molting Open circulatory system Ventral nervous system Complete digestive tract Metamorphosis

TYPES OF ARTHROPODS  Arachnids  Crustaceans  Chilopods  Diplopods  Insects

ARACHNIDS Black Widow The female black widow is one of the most poisonous creatures with venom more potent than coral snakes, cobras or rattlesnakes. However her bite is rarely fatal in humans. Why not?

ARACHNIDS  Eight pairs of appendages  Lack antennae  Lack mandibles  Divided into prosoma (cephalothorax) and opisthosoma (abdomen)  Gas exchange through book gills

BOOK GILLS

CRUSTACEANS

 The head has two compound eyes, two pairs of antennae, and three pairs of mouthparts.  A pair of green glands excrete wastes near the base of antennae.  The abdominal segments have swimmerets (swimming legs)

 The sexes are separate. Eggs are attached to the swimmerets (swimming legs) of the female. The first pair is enlarged in the male (it is used to pass sperm to the female).  The tail is fan-shaped, and ends in uropods and a telson.  Open circulatory system  Ventral nervous system

CHILOPODS

CENTIPEDES  1 pair of legs per body segment  1 pair of poison claws/fangs underneath the head  Antennae present  Simple eyes  Carnivorous

DIPLOPODS  2 pairs of legs per body segment, although some juveniles may posses only 1 pair per segment  Simple eyes if present, although many have no eyes  1 pair of antennae  Chewing mouthparts  Herbivores and Scavengers

MILLIPEDES

INSECTS  A body divided into three parts (head, thorax and abdomen)  Three pairs of legs  Usually one pair of antennae and a pair of compound eyes (a few exceptions to these characteristics are found)  Usually two pairs of wings (absent in many insects such as lice, fleas, ants; flies have one pair of wings)

INSECTS  A body divided into three parts (head, thorax and abdomen)  Three pairs of legs  Usually one pair of antennae and a pair of compound eyes (a few exceptions to these characteristics are found)  Usually two pairs of wings (absent in many insects such as lice, fleas, ants; flies have one pair of wings)

INSECT

Hydrena ateneo Source: ateneo-campus

SOURCE 