1. AQUATIC INSECTS

2. I. Phylum Arthropoda A. Major characteristics
1. Jointed appendages and…

3. 2. An exoskeleton of chitin

4. 3. Segmented body

5. II. Classes of Arthropods
B. Class Diplopoda
A. Class Arachnida
C. Class Chilopoda
D. Class Crustacea
E. Class Insecta

6. III. Characteristics of class Insecta
Only class with wings
One pair of antenna
abdomen thorax head

7. Kingdom Animalia Phylum Arthropoda Class Insecta Order Diptera
IV. Classification (use the common mosquito as an example)
Kingdom Animalia
Phylum Arthropoda
Class Insecta
Order Diptera
Family Culicidae
Genus Culex
Species pipiens
Scientific name:
Culex pipiens

8. V. Examples of AQUATIC INSECTS

9. A. The Seven Orders

10. 1. Ephemeroptera

11. mayfly nymph (naiad)

14. 2. Odonata

17. DAMSELFLY

18. 3. Plecoptera

19. stonefly nymph

20. 4. Hemiptera

21. water boatman

24. back swimmer

26. water strider

27. GIANT WATER BUG

31. WATER SCORPION

32. 5. Coleoptera

33. Diving beetle larva

35. whirligig beetle

37. Water penny

38. 6. Trichoptera

39. caddisfly larva

42. 7. Diptera

43. mosquito

44. red-tailed maggot.

45. Black flies (Simulium flies)

46. Here’s a couple of others for those who just can’t get enough of insect orders (yes, they’re optional)

47. 8. Megaloptera

48. DOBSONFLY LARVA

49. 9. Lepidoptera

50. AQUATIC MOTH

51. Stop here for today

52. VI. Metamorphosis

53. A. Incomplete metamorphosis

54. B. Complete metamorphosis

55. Mystery picture

56. Mystery picture 2

57. VII. Modifications for Aquatic Life

58. I. Air Breathing (Aeropneustic)

59. A. Regular insect-style breathing with spiracles on the abdomen

60. For insects that never submerge

61. B. Siphon a snorkel / breathing tube

62. II. Air Trapping A. Abdominal air bubble

63. B. Plastron: tiny hairs on insect’s surface that trap air

65. C. Diving bell

66. III. Water breathing (Hydropneustic) A. Using gills

67. 1. Three gills at tip of abdomen
damselfly nymph

68. 2. Single gills found under the legs
stonefly nymph

69. 3.
a. Seven pair of abdominal gills
Mayfly nymphs

70. 4. Gills inside the abdomen
dragonfly nymph

71. (extra) Lateral filaments on the abdomen of larvae
Whirligig beetle larva

72. B. Bright red hemoglobin, allows diffusion
Midge larva

73. B. Movement

74. Mystery picture 2

75. Skaters: surface tension, oil secretion, hairs
water strider

76. 2. Clingers: flat bodies with little resistance, suckers or claws;
water pennies

77. 3. Climbers: long legs holding plant stalks; dragonfly & damselfly nymphs

78. 4. Crawlers: on solid surfaces, find crevices; stonefly & mayfly nymphs

79. 5. . Burrowers: dig into substrate; midge larvae

80. 6. Swimmers: wiggle entire body fishlike; mayflies, mosquitoes

81. 7. Rowers: use oar-like modified legs

82. Also water boatman

83. C. Particular modifications

84. 1. Ripple effect

85. 2.
FOUR EYES!

86. 3. Oars bristles on legs

87. 4. Flattened body

88. Are there any MARINE INSECTS?

89. What do these numbers mean?
Estimated number of insect species
Described insect species
Known aquatic species
Insects that live on the open ocean (oceanic species)
At LEAST 3 million
± 850,000,000
30,000 5

90. Why are there so few insects living in the ocean
Why are there so few insects living in the ocean? Is it because of the salty water?

91. No. There are aquatic insects that have adapted to salty environments (like these salt marsh mosquitoes.)

92. Alkaline flies of Mono Lake (also called brine flies)

96. Intertidal rove beetle; wait in burrows till tide’s out

97. Seaweed flies; maggots eat rotting seaweed

98. But why do so few live out in the ocean?

99. 2 reasons:

100. 1. Crustaceans got there first

102. 2. They make good fish food:

103. But crustaceans survive

104. So why don’t insects just dive deeper?

105. The insect’s respiratory system is different from that of crustaceans

106. Insects can’t go deep, crustaceans can