Some bugs have very large wings.
They live near water. The babies live in the water. The grown bugs live on land. They are fun to see. Can you find a bug with big wings?
Some bugs have very large wings.
These bugs live near water. The babies live in the water. They eat small things like worms. The babies grow very slowly. It can take five years to grow up.
When they are ready, they crawl onto land. They hide in damp soil or under logs. The grown bugs have short lives. Some do not even eat as adults. They only live to find a mate. These bugs are very special.
Megaloptera are a group of insects. There are about 300 known species. This group includes alderflies, fishflies, and dobsonflies. Their name means "large wings." This is because they have big, clumsy wings.
In the Americas, many people know the dobsonfly. The males have long mandibles. These are strong jaws. They look like tusks. Males use them to impress females. They also use them to fight other males. These fights help them flip each other over.
The babies live in fresh water. We call these larvae. They are carnivores. This means they eat other small animals. They eat worms, clams, and tiny insects. They use strong jaws to catch food.
These larvae grow very slowly. It can take one to five years to grow. When they are ready, they crawl onto land. They hide in damp soil or under logs. They change into adults there. Many adults do not eat at all. They only live for a few days or weeks. They live just long enough to mate.
Megaloptera are a special group of insects. This group includes alderflies, fishflies, and dobsonflies. There are about 300 known species in this order. Their name comes from Greek words meaning "large wing." This name describes their big and clumsy wings.
Many people do not see them often. The adults live very short lives. They also like to be active at night or at twilight. This makes them hard to find.
The life of a megalopteran has a few steps. It starts with eggs laid on plants over water. A female can lay up to 3,000 eggs at once. The babies are called larvae and live in fresh water. These larvae are carnivores that eat worms and clams. They have strong jaws to catch their prey. They grow slowly over one to five years.
Finally, they crawl onto land to pupate in damp soil. The pupa can even move and use jaws to defend itself.
Scientists have studied these insects for a long time. In the past, they were part of a group called Neuroptera. Now, they are seen as a separate order. They are part of a larger group called Neuropterida. This group also includes lacewings. Megaloptera are closely related to beetles. They are also related to a group called strepsipterans.
There are many interesting facts about these bugs. In Asia, the dobsonfly Acanthacorydalis fruhstorferi is very large. It has a wingspan of up to 150 mm. This makes it the largest aquatic insect in the world by wingspan. In North America, people call the larvae hellgrammites. Anglers often use them as bait.
Some species of adults do not eat at all. They may only live for a few hours or days.
You can see how these insects fit into nature. The larvae live in the water where many fish live. The adults live near the same water. Male dobsonflies have long mandibles that look like tusks. These are not for hurting humans. They use them to impress females or to fight other males. They try to flip each other over during courtship.
Megaloptera is an order of insects that includes alderflies, fishflies, and dobsonflies. There are approximately 300 known species within this group. The name Megaloptera comes from Ancient Greek words. The word "megas" means "large," and "pteron" means "wing." This name refers to the large and clumsy wings of these insects.
Many people do not encounter them often. The adults usually have very short lives. They are also crepuscular or nocturnal, meaning they are active at twilight or night. Because of this, they remain relatively unknown in much of their range.
The life cycle of a megalopteran involves a process called complete metamorphosis. This is a type of development where an insect changes through distinct stages. Among holometabolous insects, Megaloptera show the most rudimentary form of this process. This means there are fewer differences between the larvae and the adults than in other groups. The larvae are aquatic and live in fresh water. The adults also live near these same water sources. This connection keeps their entire life cycle tied to the water.
Life begins when a female lays eggs in a single mass. She may lay as many as 3,000 eggs on vegetation overhanging water. The larvae hatch and live in the water as carnivores. They use strong jaws to capture small invertebrates. Their diet includes worms, clams, crustaceans, and other insects. These larvae have large heads and elongated bodies. They also have fine tactile filaments on their abdomens. In the family Sialidae, these filaments include tracheal gills on segments 1 through 7. In the family Corydalidae, they are found on segments 1 through 8.
These larvae can take between one and five years to reach maturity.
When the larvae are ready, they crawl onto land to pupate. They usually find damp soil or the space under logs. The pupa stage is quite unusual because it is fully motile. This means the pupa can move around. It even has large mandibles to defend itself against predators. After this stage, the short-lived adults emerge. Some species do not eat at all during their adult lives. They may live for only a few hours or days. Other species may live for up to a few weeks.
Scientists have changed how they classify these insects over time. Megaloptera were once considered part of the order Neuroptera. This former group included lacewings and snakeflies. Now, Neuroptera refers specifically to lacewings and their relatives. Megaloptera and Neuroptera are both part of a larger group called Neuropterida. Within the holometabola, the closest living relatives to the Neuropterida clade are beetles and strepsipterans.
Some prehistoric taxa, like the family Corydasialidae, are also placed within Megaloptera based on fossils.
There are several distinct families and interesting physical traits to note. The two living families are Corydalidae and Sialidae. In North America, the larvae of dobsonflies are commonly called hellgrammites. Anglers often use these larvae as bait for fishing. Some adults have large compound eyes and sometimes possess ocelli, which are simple eyes. The wings are large and subequal, meaning they are nearly equal in size. However, the hindwings have a pleated region. This feature helps the insect fold its wings over its abdomen.
Some species of Megaloptera are truly massive. The Asian dobsonfly, *Acanthacorydalis fruhstorferi*, is a notable example. It can have a wingspan of up to 150 mm. This measurement makes it the largest aquatic insect in the world by wingspan.
In some species, such as the American dobsonfly, males have very large mandibles. These look like tusks and can appear quite formidable. However, they are relatively harmless to humans and other animals. They primarily serve to impress females during courtship. Males also use them to hold females during mating. Some males even use their mandibles to spar with each other. They attempt to flip their opponents over during these displays.
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