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Extra resources for Children's Identification With the Group
The head of the chilopod has one pair of eyes in the back, consisting of two groups of eyelets, a pair of antennae, a pair of lower jaws, and one or two pairs of upper jaws. Almost all seek dark places, avoiding the light. 15 inch (4 mm) and 12 inches (30 cm) long. 1 2 DEADLY WEAPON Holding the prey with the back legs, the centipede doubles itself over, the tips of the maxillipeds (forceps) fasten like claws, and the venom is discharged through the opening at the tip. 2 SMALL BULLIES An Australian centipede, like the one in the picture, can make a person sick for a week with its bite, and it is capable of killing a dog.
The black widow (Latrodectus mactans) is one of the shyest. The venom that it injects (toxalbumin) is a neurotoxin that acts principally on the nerve endings. Still, the black widow bites only when provoked. The wandering spider (Phoneutria fera) is one of the most aggressive arachnids. It is large, and its venom is fastacting, capable of killing most prey in 15 minutes. SCORPIONS 30 species of spiders have truly dangerous venom. 1 DETECTS THE PREY Scorpions are grouped in six families, the most important being the Buthidae because it contains the most dangerous species for the potency of their venom.
It rises to the surface to fill the air chamber. Chamber under the elytra Insect's body The middle and hind legs grow from separate points on the body. MIDDLE LEGS Used as skates to glide along the water CABEZA THE SURFACE TENSION CAN WITHSTAND 15 times the ANTENNA WATER STRIDER Neogerris hesione This species lives on freshwater surfaces. 3 cm) long. AIR WALKING ON WATER The legs are arranged on the surface of the liquid in such a way as to make it an elastic film. The hind legs use this property for support and traction.