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Solifugae

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Solifugae is an order of arachnids known by many common names. People often call them sun spiders, camel spiders, or wind scorpions.

Solfugid in veld near Uniondale (Western Cape) 1600
Solfugid in veld near Uniondale (Western Cape) 1600

Their scientific name comes from Latin words meaning "those that flee from the sun." This name refers to how they avoid bright sunlight. There are more than 1,000 described species in about 147 different genera. While they look like other creatures, they are distinct groups. They are not part of the order Araneae, which includes spiders. They are also not part of the order Scorpiones, which includes scorpions.

The anatomy of a solifuge is divided into two main parts called tagmata. The front part is the prosoma, or cephalothorax. This area contains the head, mouthparts, and the legs. The back part is the opisthosoma, or abdomen.

20220608 Solifugae morphology
20220608 Solifugae morphology

Unlike spiders, solifuges do not have a narrow connecting tube called a pedicel. They also lack spinnerets and cannot produce silk to spin webs. The abdomen is made of ten segments called tergites and sternites. Large membranes between these segments allow the abdomen to stretch. This flexibility helps them consume very large amounts of food at once.

Solifuges have specialized organs to help them see and breathe. They possess a pair of large central eyes called median ocelli. These eyes have a pigment-cup structure and a domed outer lens. Below the lens sits the retina, which contains light-sensitive cells called rhabdomeres.

Solpugidae showing eyes with presumably protective bristles 2012 01 24 1019s
Solpugidae showing eyes with presumably protective bristles 2012 01 24 1019s

They also have vestigial lateral ocelli located in pits near the mouth. For breathing, they use a tracheal system instead of book lungs. They inhale air through several openings called spiracles. These openings are located on the abdomen and between the legs. They use a method called discontinuous gas exchange, similar to insects. This involves periods where the spiracles are closed and periods when they are open.

One of the most striking features of a solifuge is its chelicerae. These are the large, powerful jaws located on the prosoma. Each chelicera has two segments that act like a pincer. These pincers are strong enough to shear hair or feathers. They can even cut through skin and the thin bones of small birds.

Gluvia4
Gluvia4

Many species use these jaws to produce a rattling noise through stridulation. The prosoma is protected by a hard shield called a carapace. This shield is made of three parts: the propeltidium, mesopeltidium, and metapeltidium. The propeltidium holds the eyes and the first two pairs of legs.

Solifuges have five pairs of appendages, but not all are true legs. The first pair are pedipalps, which act like sensory organs or arms. They use these to detect obstacles and prey. The tips of the pedipalps have a membranous suctorial organ. These act like tiny suction cups to help them drink or climb.

Solifugae Ventral aspect of respiratory slots 2012 01 24 0985s
Solifugae Ventral aspect of respiratory slots 2012 01 24 0985s

The second pair of appendages also serves a sensory role. Only the last three pairs of legs are used primarily for running. The fourth pair of legs features fan-shaped organs called malleoli. These malleoli act as chemoreceptors to help the animal smell its environment.

These arachnids are mostly found in dry, warm climates. They live in tropical and subtropical deserts across the Americas, Africa, and Asia.

Gluvia4
Gluvia4

Interestingly, they are absent from Australia and Madagascar. They inhabit many different areas like sand dunes, rocky hillsides, and mountain valleys. Some species are sedentary and live in permanent underground burrows. Other species are active and spend much of their time on the surface. They are carnivores that hunt by stalking, chasing, or ambushing prey. They eat insects, spiders, scorpions, and even small lizards or mammals.

Solifuges are known to be very voracious eaters. They are generalists, meaning they eat many different types of small animals. Some species are so hungry that females can become temporarily unable to walk after eating. They use a combination of senses to hunt successfully. They use their eyes to see movement and their setae, or hairs, to feel vibrations. They also use their malleoli to sense chemicals in the air. This complex system of senses helps them thrive in harsh desert environments.

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🖼️ Images & Media (6)
File:20220608 Solifugae morphology.png
20220608 Solifugae morphology.png
File:Solpugidae_showing_eyes_with_presumably_protective_bristles_2012_01_24_1019s.JPG
Solpugidae_showing_eyes_with_presumably_pr...
File:Solfugid in veld near Uniondale (Western Cape) 1600.jpg
Solfugid in veld near Uniondale (Western...
File:Solifugae Ventral aspect of respiratory slots 2012 01 24 0985s.JPG
Solifugae Ventral aspect of respiratory...
File:Gluvia4.jpg
Gluvia4.jpg
File:Solifugo XIX.jpg
Solifugo XIX.jpg
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