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Adaptation Project The arthropods constitute over 90 of the animal kingdom and are classified in the phylum Arthropoda There are more arthropods than any other group of invertebrates And considering that 95 percent of all animals are invertebrates that makes arthropods truly the must abundant group This is how the whole group is classified an exoskeleton a skeleton on the outside of the body body divided into distinct parts jointed legs and appendages bilateral symmetry both sides of the body are the same I will focusing on the arthropod Arachnid Arachnids There are many different types varying from Spiders scorpions ticks mites etc 65000 described world species two body regions cephalothorax abdomen eight legs no antennae Mouth parts are cheliceraemodified appendages which in spiders are fangs Spiders are ancient animals with a history going back many millions of years They have always been with us an ancient source of fear and fascination They are abundant and widespread and are natural controllers of insect populations Wherever you live youre always close to a spider Mating behaviour Mating organs in closely related species often have very distinctive structural differences which along with behavioural and chemical recognition cues have evolved to prevent unproductive attempts at cross-breeding between species In many cases the structure of the mating organs in mature spiders is the most important means we have of separating closely related species Until they mature it is almost impossible to reliably identify spiders to a particular species A male Orb Weaver Eriophora plucks at his mating line and entices a female onto it Photo M Gray Australian Museum Egg sacs and maternal care AustralianThe egg sac silk protects the eggs against physical damage and excessive drying wetting or heating as well as providing a shield against predators like ants and birds However this protection is often breached by parasitic wasps flies and mantispid lacewings
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