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Libellulidae

life science Maturity 11-13 Next article →

Libellulidae is the largest family of dragonflies on Earth. These insects are often called chasers, darters, skimmers, or perchers. They are incredibly common because they have a nearly worldwide distribution. Even if you exclude certain subfamilies, the group contains over 1,000 different species. This vast diversity makes them one of the most successful insect families. They play important roles in many different ecosystems around the globe.

The name Libellulidae comes from the Latin word "libella." This word means a carpenter's level. A carpenter's level is a tool used to ensure a surface is flat and even. This name was chosen because of the insect's unique ability to stay level while hovering. This hovering skill is a key characteristic of many members in this family. It allows them to navigate their environments with great precision.

To understand their life cycle, we must look at their larval stage. The larvae, or young dragonflies, have very stout and thick bodies. They possess a specialized anatomical feature called a labium. The labium is a structure that functions as the insect's lower lip. In Libellulidae, this labium is developed into a mask. This mask covers the lower part of the larva's face. This specialized anatomy is a defining trait of the family.

Scientists categorize these dragonflies into many different genera. The genus Sympetrum includes insects known as darters or meadowhawks in North America. These darters are found throughout most of the world, except for Australia. The genus Libellula is mostly found in the New World. Some members of this genus have brightly colored bodies or banded wings. One specific species, Libellula angelina, is an endangered odonate found in Japan.

Libellulidae - Oryctodiplax gypsorum
Libellulidae - Oryctodiplax gypsorum

Other groups show even more variety in color and appearance. The genus Plathemis includes a group known as the whitetails. In the southern United States, the genus Celithemis contains several brightly marked species. Some tropical species in the genera Trithemis and Zenithoptera are considered especially beautiful. Other common genera that belong to this large family include Tramea and Pantala. Each genus represents a different branch of this massive insect family.

We can learn about the history of Libellulidae through the fossil record. The earliest known record is the fossil genus †Palaeolibellula. This fossil was found in the Turonian period of Kazakhstan. Scientists believe it represents a stem-member of the family. This means it is an ancestral relative from a very early time. Many other fossil genera have been discovered in Europe. These include †Caussanelia and †Jeanlegrandia, which date back to the Late Oligocene of France.

Libellulidae - Oryctodiplax gypsorum
Libellulidae - Oryctodiplax gypsorum

Fossil evidence spans many different geological time periods and locations. For example, fossils like †Lithemis and †Oligocaemia were found in the mid-late Miocene of Croatia. In Italy, researchers found the fossil genus †Oryctodiplax from the Late Miocene. Other fossils have been identified in Germany, such as †Parabrachydiplax from the Middle Miocene. There are even older records like †Molertrum from the earliest Eocene of Denmark. These fossils help scientists map the long evolutionary journey of the Libellulidae family.

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File:Libellulidae - Oryctodiplax gypsorum .JPG
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