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Millipede

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Millipedes are a diverse group of multi-legged land animals. They belong to the class Diplopoda. This scientific name describes their most unique physical feature. Most of their body segments possess two pairs of jointed legs. This occurs because two single segments have fused together into one double-legged segment.

Millipede centipede side-by-side
Millipede centipede side-by-side

This class is the largest group within the myriapods. Myriapods are a subphylum of arthropods that includes centipedes and pauropods. While many people think they have exactly one thousand legs, that is not true for most species. The name comes from Latin words meaning "thousand feet."

However, a species named Eumillipes persephone was discovered in 2020 with over 1,300 legs.

Most millipedes follow a specific biological process to survive. They are primarily detritivores, which means they eat decaying leaves and dead plant matter. Some species also eat fungi or drink fluids from plants.

Anadenobolus monilicornis 03
Anadenobolus monilicornis 03

Because they move slowly, they rely on defense rather than speed. Many species secrete various chemicals from specialized pores along their bodies. Tiny bristle millipedes use a different method. They are covered in tufts of detachable bristles for protection.

Octoglena sierra (Family Polyzoniidae) (3405605943)
Octoglena sierra (Family Polyzoniidae) (3405605943)

Another common defense is curling into a tight coil. This behavior protects their delicate legs and vital organs behind a hard exoskeleton. This is especially common in pill millipedes, which have shorter, specialized bodies.

Scientists divide the living Diplopoda into sixteen different orders. These are organized into two main subclasses. The first subclass is Penicillata, which contains only one order: Polyxenida, the bristle millipedes.

Millipede body types 1
Millipede body types 1

The second subclass is Chilognatha. This subclass contains two infraclasses. One is Pentazonia, which includes the short-bodied pill millipedes. The other is Helminthomorpha, which contains the majority of millipede species. These are often referred to as worm-like millipedes.

Millipede order species comparison
Millipede order species comparison

This complex classification helps researchers understand how different species are related.

Millipedes are among the oldest land animals on Earth. They first appeared during the Silurian period. One early fossil is Pneumodesmus newmani from the late Silurian or early Devonian. This fossil shows clear evidence of spiracles, which are breathing holes.

Millipede anterior anatomy
Millipede anterior anatomy

In the prehistoric Carboniferous period, some millipedes grew to massive sizes. A group called Arthropleura reached lengths exceeding 2.5 meters. Scientists debate why they grew so large. Some suggest high atmospheric oxygen levels helped. Others believe a lack of competition allowed them to thrive. Today, the largest living species is the giant African millipede, Archispirostreptus gigas.

There are approximately 12,000 named species of millipedes today. These are spread across 16 orders and about 140 families. However, scientists estimate the true number of species could be much higher. Some estimates suggest there are between 15,000 and 80,000 species on Earth.

Harpaphe haydeniana 0446
Harpaphe haydeniana 0446

Most millipedes do not travel very far. They have poor dispersal abilities because they rely on walking on land. They also require very humid habitats to survive. This often leads to genetic isolation and the creation of many unique lineages in restricted ranges.

It is important to distinguish millipedes from centipedes. They are both myriapods, but they have very different lifestyles.

Millipede centipede side-by-side
Millipede centipede side-by-side

Centipedes belong to the class Chilopoda. Unlike millipedes, centipedes are carnivorous and move very rapidly. They also possess venom to catch their prey. Physically, centipedes have only one pair of legs on each body segment. Their heads are also different. Centipedes have long, threadlike antennae and large poison claws. Millipedes have short, elbowed antennae and robust mandibles for grinding plant matter.

The scientific study of these creatures is called diplopodology. A person who studies them is a diplopodologist. The history of this science began with Carl Linnaeus in 1758. Later, Pierre André Latreille proposed the name Chilognatha in 1802. In 1844, Henri Marie Ducrotay de Blainville coined the name Diplopoda. Between 1890 and 1940, many researchers described thousands of new species. This era saw the highest rates of species descriptions in history. Today, molecular studies continue to challenge and refine how we classify these ancient, many-legged animals.

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🖼️ Images & Media (18)
File:Millipede order species comparison.png
Millipede order species comparison.png
File:Octoglena sierra (Family Polyzoniidae) (3405605943).jpg
Octoglena sierra (Family Polyzoniidae)...
File:Anadenobolus monilicornis 03.JPG
Anadenobolus monilicornis 03.JPG
File:Harpaphe haydeniana 0446.JPG
Harpaphe haydeniana 0446.JPG
File:Pauropus huxleyi.jpg
Pauropus huxleyi.jpg
File:Millipede centipede side-by-side.png
Millipede centipede side-by-side.png
File:Millipede body types 1.jpg
Millipede body types 1.jpg
File:Millipede anterior anatomy.png
Millipede anterior anatomy.png
File:Paranota comparison.png
Paranota comparison.png
File:Female Illacme plenipes (MIL0020) with 618 legs - ZooKeys-241-077-SP-6-top.jpg
Female Illacme plenipes (MIL0020) with...
File:Mating millipedes.jpg
Mating millipedes.jpg
File:Anamorphic development in Nemasoma.png
Anamorphic development in Nemasoma.png

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