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Rhaphidophoridae

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The Rhaphidophoridae are a worldwide family of insects within the suborder Ensifera. They are known by many common names, including cave crickets, camel crickets, and spider crickets. Some people even call them "criders" or "sprickets." In New Zealand, certain members are called jumping or cave wētā.

Camel Cricket dsc00387 Neda
Camel Cricket dsc00387 Neda

While they may look like field crickets or members of the Tettigoniidae family, they are actually quite distinct. There are more than 500 described species in this group. They play unique roles in various ecosystems around the globe.

Most Rhaphidophoridae possess very specific physical adaptations for life in the dark. They are all flightless, meaning they lack wings entirely. Their bodies are often brownish and have a humpbacked appearance. They are characterized by extremely long, slender antennae that arise close together on the head.

Enlène, Grasshopper
Enlène, Grasshopper

They also have very large hind legs. These legs consist of drumstick-shaped femora and long, thin tibiae. These limbs allow them to jump effectively to avoid predators, which is vital since their vision is often limited.

These insects are primarily nocturnal, meaning they are most active during the night. Many species inhabit cool, damp environments such as caves or old mines. You might also find them in animal burrows, under stones, or within rotten logs and hollow trees. Some species even live in alpine areas near permanent ice, such as the Mount Cook "flea" in New Zealand.

Talitropsis sedilotti 'cave' weta
Talitropsis sedilotti 'cave' weta

Others, known as sand treaders, live in sand dunes. These sand treaders burrow into the sand during the day to minimize water loss.

Rhaphidophoridae are categorized into several subfamilies and tribes. The Ceuthophilinae subfamily includes many North American cave crickets and camel crickets. The Dolichopodinae subfamily is found in southern Europe and western Asia. The Macropathinae subfamily includes Gondwanan cave crickets found in Australia, New Zealand, South America, and South Africa.

Male Pachyrhamma edwardsii from Golden Bay New Zealand
Male Pachyrhamma edwardsii from Golden Bay New Zealand

New Zealand is particularly diverse, containing many genera like Pachyrhamma and Macropathus. There is even an unnamed genus discovered in 2005 within a cave in the Grand Canyon–Parashant National Monument. This specific insect has unique, functional grasping cerci on its posterior.

Humans have interacted with these insects for thousands of years. An engraving of a female Troglophilus was found on a bison bone in the Cave of the Trois-Frères. This suggests that prehistoric populations in the Magdalenian period may have seen them as pets or pests. In modern times, they are often considered "accidental invaders" in human buildings. They frequently wander into basements, drains, sewers, and laundry areas. In Japan, they are common in chilly regions and are colloquially called benjo korogi, which means "toilet cricket."

Ecologically, most Rhaphidophoridae act as scavengers. They survive by eating various plant, animal, and fungi materials. This scavenging helps recycle nutrients within their environments. In the sand dunes of California and Utah, they serve as a vital food source for scorpions. They are also preyed upon by a specialized bird called the LeConte's thrasher. This bird searches the Mojave and Colorado Deserts for the debris left by hiding sand treaders.

Understanding Rhaphidophoridae helps scientists learn about specialized survival. Their long antennae are essential for navigating lightless environments through touch. Because they often live in habitats where nutrients are scarce, their scavenging lifestyle is a key survival strategy. Whether they are living in deep caves or suburban basements, these insects demonstrate how life adapts to specific, often difficult, niches.

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🖼️ Images & Media (4)
File:Camel Cricket dsc00387 Neda.jpg
Camel Cricket dsc00387 Neda.jpg
File:Male Pachyrhamma edwardsii from Golden Bay New Zealand.jpg
Male Pachyrhamma edwardsii from Golden...
File:Talitropsis sedilotti 'cave' weta.jpg
Talitropsis sedilotti 'cave' weta.jpg
File:Enlène, Grasshopper.jpg
Enlène, Grasshopper.jpg
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