Preface 4
Note 5

a group of aquatic beetles

Understanding the Crowd 10
Morphological and structural features 12
Family Search Table 14
List of included species 16

Water beetle 20
Waterfowl 48
Water Mite Family 51
Purple Water Beetle 57
59 of the Albino Flea Family
Family 61 of the family Pteridophyta
Waterfowl 62
77 of the family Horigamis tadpoles
79
85 of the family Apiaceae
Mudworm family 86
Water beetle family 88

A flock of aquatic insects

Understanding the Crowd 92
Morphological and structural features 94
Family Search Table 96
List of included species 98

100 water bugs
Stink bug 101
102 of the Silsokjeongidae family
Saltstrider 103
108 Saltworts
Water General and 110
Family Jangguaebiidae 114
Water Bug Family 118
125 of the family Apididae
Waterfowl 126
Waterfrog family 127
128 of the family Scorpionfish
130 roundworms
Family 132 of the family Apididae

Reference 133
Quick Find 135
Search 150

Water beetle, water snail, water snail, water snail, water general, water snail… …
Beetles and stink bugs live in the underwater world too.

Have you ever seen a water beetle with air bubbles on its butt?

Aquatic beetles have entered aquatic ecosystems at least 10 times in the evolutionary history of beetles and have adapted to them more than 20 times.
So they live in a variety of environments, including rivers, springs, lakes, ditches, groundwater, and even under ice or in highly saline ponds.
In Korea, 167 species belonging to 67 genera and 13 families have been recorded (as of 2021), and the representative species is the water beetle, which was very common in the past but is now endangered.

From slender salt striders to mighty water generals

Aquatic stink bugs are divided into true aquatic stink bugs that live in water and semi-aquatic stink bugs that live on the surface of the water.
Adult stink bugs can fly, but adult stink bugs have long or short wings, and some have no wings, so they cannot fly.
There are 84 species in 14 families and 34 genera in Korea (as of 2021).
This group includes the common salt strider and the now very rare water general.

I hope we can meet not only in memory but also in reality

Children observe black water beetles, large water bugs, whirling water beetles, and scurrying water striders in the local stream.
It's a scene that's vivid in my memory, but hard to see these days.
As the aquatic environment is damaged by various developments, winged adults leave their existing habitats, and wingless larvae and species disappear without being able to find new habitats.
This book, which covers 71 species of beetles and 33 species of stink bugs that live in water, is also a record of our earnest hope that they will remain not only in our memories but also in reality.