On this map you see where there were observations of Booklice and Barklice around the world. This will give you an idea of the global distribution of this class. Note that a class can have many different families, and thousands of species.
Years 2000 until now, source: GBIF
The insect class Psocoptera, commonly known as barklice or booklice, consists of over 5,500 known species. These small insects are characterized by their soft bodies, large heads, and distinctive wings that are held roof-like over their abdomens when at rest. Psocoptera is divided into several families and genera, with some of the most well-known families being Psocidae, Liposcelididae, and Lachesillidae.
Psocoptera insects can be found in a range of countries, primarily in temperate and tropical regions. They're distributed across North and South America, Europe, Africa, Asia, and Australia and inhabit a variety of environments, including forests, grasslands, and urban areas, where they can be found on tree bark, leaf litter, and even in homes.
The life cycle of Psocoptera insects consists of three stages: egg, nymph, and adult. The duration of each stage varies among species.
Female Psocoptera lay their eggs on or near their preferred food source, such as tree bark or leaf litter, depending on the species. Upon hatching, the nymphs feed on organic materials, such as fungi, algae, and lichen. Psocoptera nymphs undergo several molts as they grow, and once they reach their final nymphal stage, they molt one last time to become adult Psocoptera insects.
Psocoptera insects, due to their small size and feeding habits, are not typically relevant to fly fishing. Their primary food sources, such as fungi, algae, and lichen, do not coincide with the diets of most fish. Additionally, Psocoptera insects are not known to be a significant food source for fish, as they rarely end up in the water and their small size makes them less appealing.
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Each order has an indication of its relevance to fly fishing:
= Not so relevant
= Somewhat relevant
= Most relevant