There are creatures that resemble 8-legged insects.
By definition, insects have three pairs of legs.
So if you want to learn more about creatures that look like insects with eight legs, then this article is for you.
Insects That Appear to Have 8 Legs
Have you ever looked at a spider web clinging on a building corner and the 8-legged spider lurking and wondered if an insect could have 8-legs?
Well, biologically, that is not possible since insects technically must have only 3 pairs of legs.
Yet, there are insect-like creatures with 4-pairs of legs.
Are they not insects, too?
What are they then?
Here’s the answer: These 8-legged arthropods are called arachnids of the class Arachnida. They are not insects.
Characteristics of Arachnids
The arachnids have the following characteristics:
- They have 8 legs.
- They don’t have antennae and wings.
- Their body is divided into two segments: cephalothorax and abdomen. The cephalothorax is made by fusion of the head and thorax.
- They have a hard exoskeleton made up of chitin.
- They have additional appendages called chelicerae and pedipalps.
So, we should correct the question, so it reads: Are there arthropods with 8-legs?
Here are examples of 8-Legged arthropods:
The largest order of class Arachnida is these 8-legged silk pinners, containing over 49,000 species, some of which build webs to ensnare their prey.
They are found all around the world except Antarctica. They don’t move their legs by the muscular activity of extensors that exists in other arthropods; rather, they use hydraulic pressure to move legs.
This is why if the spider has punctured the cephalothorax, it will be unable to extend its legs.
On the other hand, jumping spiders can jump up 50 times their size by suddenly increasing the pressure in their legs.
They are active predators (carnivores) except Bagheera kiplingi, a vegetarian jumping spider.
They use their legs to mimic catch and hold their prey. Spider’s legs consist of 7 parts:
- Tarsus and claws
They keep at least four legs on the ground while walking or running. Examples other than jumping spiders include:
- Ground spiders
- Sac spiders
- Crab spider
These 8-legged arachnids are thought to be dangerous to humans. They are characterized by their legs, large pedipalps on the anterior end, and a long, thin, segmented abdomen with a stinger at the tip.
But in fact, only 25 out of 2650 species are capable of killing a man. These include:
- Black fat-tailed scorpion
- Brazilian yellow scorpion
- Deathstalker scorpion
They use their legs to walk, run, and dance before mating. Then, they give birth to their young, and the female carries them on its body until a hard exoskeleton develops.
Scorpions have poor vision but a strong sense of smell.
These blood-sucking arachnids are very clever. They detect their host by olfactory stimuli and move in to attach to its body. They find an appropriate place, cut through the epidermis of the skin, and drink its blood.
They need blood to convert from one stage to the next of their life cycle. Their saliva contains 1500-3000 proteins, some of which prevent the detection by the host for a long period allowing the tick to drink blood for days.
They can drink blood 200-600 times of their own body weight and become engorged with blood. They also transmit diseases such as Crimean-Congo hemorrhagic fever or Lyme disease in humans and tick fever in animals.
Tick is categorized as either Example include hard ticks and soft ticks.
These tiny arachnids are multidimensional. They are free-living, decomposers, parasites, and active predators.
With a size of less than 1 mm (the width of a dime), they may easily be ignored while present on animals, plants, in water, and on surfaces.
Mites have 4 pairs of legs; each leg is made up of 6 segments and is sometimes modified for swimming. Examples include:
- Clover mites that have a pair of long legs often confused with antennae
- Eyelash or face mites that affect human skin
- Sarcoptic mites that cause scabies
#5 Harvestmen (Also called Daddy Longlegs)
Harvestmen are a great group of class Arachnida characterized by long legs often confused with spiders, but they are different.
As in all arachnids, their body comprises two segments, but segments are fused and appear as a single segment externally.
Despite having a pair of eyes in the middle of the cephalothorax, they use the second pair of their long legs like antennae to sense the environment.
- Hadrobunus grandis (long-legged harvestmen)
- Mite harvestmen (short-legged)
- Sabacon cavicolens
With over 1000 known species, this group of arachnids is also called camel spiders or wind scorpions. However, they have nothing to do with spiders or scorpions.
They appear to have 10 legs (5 pairs), but only 4 pairs are considered true legs, each consisting of 7 segments.
The anterior pair is actually pedipalps and is used as a sensory organ and the first pair of true legs.
Confusion was due to leg length. The pedipalps do not rest on the ground while walking or standing. Rather they are kept raised to sense the environment.
They also have a sticky structure at the end to capture the prey. The leg length in solifuges varies greatly and often causes confusion. Examples include sun spiders and Gulvia dorsalis.
These tiny creatures resemble scorpions but are actually beneficial to humans because they prey upon harmful arthropods like clothing moths, carpet beetles, ants, and other pests.
Pseudoscorpions are 8-legged and have large, strong pedipalps resembling scorpions. This is why they are called pseudoscorpions (false scorpions). House scorpions are a good example.
#8 Hooded-Tick Spiders
Belonging to family Ricinulei of arachnids, these creatures are characterized by a hood over the head that can be raised and lowered.
They have 8 legs and pedipalps specially designed to manipulate the food.
Like harvestmen, the first pair of the true legs is the longest and is used for sensory purposes.
A good example is Cryptocellus goodnighti which lives in Costa Rica.
#9 Whip Spiders
They are sometimes called tailless whip scorpions. Their distinguishing features include no venomous fangs and no silk glands (the most important spider’s feature).
They also differ from whip scorpions because of their characteristically blunt tail. In addition, they have raptorial pedipalps as in mantises, 8 eyes, and 8 legs.
They don’t use their first pair of legs for walking or running but as sensory structures. A good example is Heterophrynus.
#10 Whip Scorpions
Whip scorpions or Vinegaroons belong to order Thelyphonida of class Arachnida. They have whip-like tails and release a vinegar-like liquid when disturbed. This is why some people call them vinegaroons.
The bottom line is that creatures like spiders, scorpions, harvestmen, ticks, mites, and solifuges look like insects.
Still, they lack antennae, have 8 legs, have pedipalps, drink their food after liquefying it, and have a body consisting of two segments. Therefore, they are called Arachnids.