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salt, adaptation to freshwater environments, 17 sarcoptes mite, 84 scallop, 29 scorpion anatomy, 51 description, 44 desert, 51

emperor, 44 families, 51 habitat, 51 hunting, 50 sea anemone anatomy, 23

cnidarian characteristics, 21 dangerous, 23 preferred environment, 23 shape adaptation, 23 sea angel, 28 sea cucumber, 15, 20 sea lice, 36, 37 sea lily, 20

sea slug (Opisthobranchia), 15, 28 sea urchin, 20

photoreceptors, 24 radiant, 15

varieties and characteristics, 25 seven-spotted ladybug, 58, 66 shrimp, 40 Sidneyia (fossil), 9 silk, spiders, 45, 46-47 silkworm, 13 silverfish, 13 slug characteristics, 28 sea, 15 snail, 82

brown garden, 13, 28-29 great pond, 17 southern wood ant, 75 spider, 13, 83 anatomy, 45 black widow, 50 crab, 49 diving bell, 17 Dysdera crocota, 49 food chain, 12 fossilized in amber, 10-11 giant household, 44 hunting, 50 jumping, 49 ogrefaced, 49 reproduction, 45

senses, 48-49 sensory hairs, 48 silk, 45, 46

uses of silk thread, 47 venom composition, 50 web use, 5 See also arachnid spiderweb architecture, 47 silk, 46 use, 5 spinneret, 46 spiny-headed worm, 82 sponge, 15, 20 squid bigfin reef, 15 characteristics, 29

starfish anatomy, 24-25 common, 15 movement, 25 photoreceptors, 24 red, 15 suckers, 22 stick insect, Australian, 77 stinger, scorpions, 51 suction, 24, 33

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