Arachnids | Arachnida

Arachnida is a class of invertebrates with jointed-legs, most have eight legs, but some have front legs that have converted to a sensory function or appendages that appear to be legs. The legs serve various purposes, such as feeding, defense, and perceiving the Arachnida’s surroundings. Almost all arachnids are terrestrial, although some live in freshwater and marine environments. Spiders are the largest order in the class, but mites, ticks, and scorpions are also members of this class. The term, Arachnida, comes from Greek mythology when a prideful human weaver named Arachne was turned into a spider.

How many legs do arachnids have?

Arachnids have 8 legs, 2 main body segments, no wings or antennae, and are not able to chew. In some species arachnids can grow extra appendages that can look like extra legs. They often get confused with insects, but insects only have 6 legs.

What do arachnids eat?

Most species of arachnids can only eat food in a liquid form and not in solids. They do so by squirting digestive chemicals into their prey and then sucking out the body juices. Arachnids typically eat insects and other invertebrates. Mites are the only arachnids who consume a wider variety of food like fungus, plants, dead animals, bacteria, and other invertebrates.

How are arachnids different from insects?

Arachnids have 8 legs while insects have 6. Arachnid bodies are divided into 2 parts, the cephalothorax and abdomen and insect bodies are divided into 3, the head, thorax, and abdomen. Arachnids do not have an antennae nor wings, while all insects have antennae and some also have wings. Insects belong to the Insect class and arachnids to the Arachnida class.

Arachnids Guides
Browse through our curated Arachnids Guides for additional categorizations, tips, details, variations, styles, and histories of Arachnids. Guides provide additional insights into the unique properties and shared relationships between elements.
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.55”-.67” | 1.4-1.7 cm
.51”-.63” | 1.3-1.6 cm
3.1”-3.9” | 7.9-9.9 cm
.02-.17 oz | .5-5 g
3-8 years
Arabian Fat-Tailed Scorpion
1.700
1.600
9.900
0.005
8.00
900
3D
Arabian Fat-Tailed Scorpion
.16”-.22” | .4-.55 cm
.39”-.51” | 1-1.3 cm
2.56”-3.15” | 6.5-8 cm
2 oz | 57 g
5-7 years
Arizona Bark Scorpion
0.550
1.300
8.000
0.057
7.00
10800
3D
Arizona Bark Scorpion
.14”-.24” | 3.5-6 mm (Male); .18”-.28” | 4.5-7 mm (Female)
.12”-.2” | 3-5 mm (Male); .16”-.24” | 4-6 mm (Female)
.95”-1.54” | 24-39 mm (Male); 1.22”-1.85” | 31-47 mm (Female)
1-2 years
Black House Spider
0.700
0.600
4.700
2.00
41600
3D
Black House Spider
.08”-.2” | 2-5 mm
.98”-2.56” | 25-65 mm
.39”-.91” | 10-23 mm
1-3 years
Bold Jumping Spider
0.500
6.500
2.300
3.00
28000
3D
Bold Jumping Spider
.03”-.04” | .7-1 mm
.04”-.07” | 1.1-1.7 mm
.17”-.24” | 4.2-6.2 mm
3-18 months
Brown Dog Tick
0.100
0.170
0.620
1.50
24000
3D
Brown Dog Tick
.09”-.16” | 2.2-4 mm
.08”-.16” | 2-4 mm
.83”-1.46” | 21-37 mm
2-4 years
Brown Recluse Spider
0.400
0.400
3.700
4.00
139000
3D
Brown Recluse Spider
.12”-.18” | 3-4.5 mm (Male); .28”-.37” | 7-9.5 mm (Female)
.12”-.16” | 3-4 mm (Male); .22”-.3” | 5.5-7.5 mm (Female)
.98”-1.38” | 25-35 mm (Male); 2.05”-2.72” | 52-69 mm (Female)
1-3 years
Brown Widow
0.950
0.750
6.900
3.00
61300
3D
Brown Widow
.43”-.67” | 11-17 mm
.35”-.55” | 9-14 mm
5.51”-8.07” | 14-20.5 cm
1-1.5 years
Camel Spider
1.700
1.400
20.500
1.50
247060
3D
Camel Spider
.013”-.016” | .34-.4 mm
.018-.02” | .45-.5 mm
.055”-.063” | 1.4-1.6 mm
2-3 weeks
Clover Mite
0.040
0.050
0.160
0.06
9400
3D
Clover Mite
.06”-.12” | 1.5-3 mm (Male); .14”-.22” | 3.5-5.5 mm (Female)
.05”-.1” | 1.2-2.5 mm (Male); .12”-2” | 3-5 mm (Female)
.33”-.67” | 8.5-17 mm (Male); .79”-1.3” | 20-33 mm (Female)
1-2 years
Common House Spider
0.550
0.500
3.300
2.00
30000
3D
Common House Spider
.28”-.43” | .7-1.1 cm
.43”-.71” | 1.1-1.8 cm
2.75”-4.33” | 7-11 cm
.035-.09 oz | 1-2.5 g
4-12 years
Deathstalker
1.100
1.800
11.000
0.003
12.00
17200
3D
Deathstalker
Deer Tick
129000
.01”-.024” | .2-.6 mm
.02”-.06” | .5-1.5 mm
.08”-.24” | 2-6 mm
2-3 years
Deer Tick
0.060
0.150
0.600
3.00
129000
3D
Deer Tick
.75”-1.02” | 1.9-2.6 cm
1.02”-1.46” | 2.6-3.7 cm
5.9”-7.9” | 15-20 cm
1-2 oz | 28-57 g
5-8 years
Emperor Scorpion
2.600
3.700
20.000
0.057
8.00
24400
3D
Emperor Scorpion
.07”-.17” | 1.8-4.3 mm
.08”-.18” | 2-4.5 mm
2.64”-6.18” | 6.7-15.7 cm
1 year
European Harvestman
0.430
0.450
15.700
1.00
4250
3D
European Harvestman
.39”-.67” | 1-1.7 cm
.75”-1.25” | 1.9-3.2 cm
3.94”-7.1” | 10-18 cm
.14-.25 oz | 4-7 g
7-10 years (wild); 15-20 years (captivity)
Giant Hairy Scorpion
1.700
3.200
18.000
0.007
20.00
4000
3D
Giant Hairy Scorpion
.35”-.55” | .9-1.4 cm
.47”-.71” | 1.2-1.8 cm
1.57”-2.36” | 4-6 cm (Body)
.035-.07 oz | 1-2 g
4-7 years
Giant Whip Scorpion
1.400
1.800
6.000
0.002
7.00
1800
3D
Giant Whip Scorpion
1.57”-2.24” | 4-5.7 cm
1.57”-2.24” | 4-5.7 cm
8.07”-11.42” | 20.5-29 cm
5-6.2 oz | .14-.18 kg
3-6 years (Male); 10-20 years (Female)
Goliath Birdeater
5.700
5.700
29.000
0.180
20.00
120000
3D
Goliath Birdeater
.12”-.14” | 3-3.5 mm (Male); .13”-.24” | 3.2-6 mm (Female)
.11”-.13” | 2.8-3.3 mm (Male); .12”-.22” | 3-5.5 mm (Female)
1.02”-1.18” | 26-30 mm (Male); 1.1”-2.05” | 28-52 mm (Female)
1 year
Green Lynx Spider
0.600
0.550
5.200
1.00
6950
3D
Green Lynx Spider
.03”-.04” | .8-1.1 mm
.07”-.09” | 1.7-2.3 mm
.22”-.31” | 5.5-8 mm
.66-2 years
Lone Star Tick
0.110
0.230
0.800
2.00
57500
3D
Lone Star Tick
1.8”-2.4” | 4.5-6 cm
5.1”-7.1” | 13-18 cm
11.8”-15.75” | 30-40 cm
2.2-10 lb | 1-4.5 kg
12-20 years
Mangrove Horseshoe Crab
6.000
18.000
40.000
4.500
20.00
230
3D
Mangrove Horseshoe Crab
.055”-.07” | 1.4-1.8 mm
.06”-.08” | 1.5-2 mm
.28”-.35” | 7-9 mm
1 year
Peacock Spider
0.180
0.200
0.900
1.00
43000
3D
Peacock Spider
.11”-.13” | 2.7-3.4 mm (Male); .17”-.22” | 4.2-5.6 mm (Female)
.14”-.19” | 3.6-4.7 mm (Male); .22”-.26” | 5.7-6.7 mm (Female)
1.57”-1.97” | 40-50 mm (Male); 2.48”-3.27” | 63-83 mm (Female)
1-2 years
Rabid Wolf Spider
0.560
0.670
8.300
2.00
13900
3D
Rabid Wolf Spider
.006”-.008” | .15-.2 mm
.008”-.01” | .2-.3 mm
.04”-.05” | 1-1.3 mm
2-4 weeks
Red Spider Mite
0.020
0.030
0.130
0.08
12000
3D
Red Spider Mite
.07”-.09” | 1.8-2.4 mm (Male); .19”-.24” | 4.7-6 mm (Female)
.06”-.09” | 1.6-2.2 mm (Male); .17”-.21” | 4.3-5.4 mm (Female)
.43”-.55” | 11-14 mm (Male); 1.1”-1.34” | 28-34 mm (Female)
1-3 years
Redback Spider
0.600
0.540
3.400
3.00
61300
3D
Redback Spider
.2”-.3” | .5-.75 cm
.28”-.39” | .7-1 cm
1.97”-2.75” | 5-7 cm
2 oz | 57 g
3-8 years
Striped Bark Scorpion
0.750
1.000
7.000
0.057
8.00
3800
3D
Striped Bark Scorpion
.26”-.53” | .65-1.35 cm
.47”-.98” | 1.2-2.5 cm
1”-2” | 2.5-5 cm (Body)
.009-.035 oz | .25-1 g
5-10 years
Tailless Whip Scorpion
1.350
2.500
5.000
0.001
10.00
26100
3D
Tailless Whip Scorpion
.22”-.33” | 5.5-8.3 mm (Male); .17”-.26” | 4.3-6.6 mm (Female)
.18”-.28” | 4.5-7 mm (Male); .14”-.22” | 3.5-5.5 mm (Female)
.94”-1.46” | 24-37 mm (Male); .75”-1.1” | 19-28 mm (Female)
1-2 years
Water Spider | Diving Bell Spider
0.830
0.700
3.700
2.00
28800
3D
Water Spider | Diving Bell Spider
.13”-.17” | 3.2-4.3 mm (Male); .25”-.33” | 6.3-8.4 mm (Female)
.13”-.18” | 3.4-4.5 mm (Male); .26”-.35” | 6.7-9 mm (Female)
.75”-1.02” | 19-26 mm (Male); 1.5”-1.97” | 38-50 mm (Female)
2-3 years
Western Black Widow
0.840
0.900
5.000
3.00
10000
3D
Western Black Widow
.06”-.1” | 1.5-2.6 mm (Male); .22”-.32” | 5.7-8.2 mm (Female)
.1”-.18” | 2.5-4.5 mm (Male); .39”-.55” | 10-14 mm (Female)
.55”-.94” | 14-24 mm (Male); 2”-2.91” | 51-74 mm (Female)
1-2 years
Yellow Garden Spider
0.820
1.400
7.400
2.00
34400
3D
Yellow Garden Spider
.05”-.08” | 1.2-2 mm
.06”-.1” | 1.5-2.5 mm
.2”-.35” | 5-9 mm
1-2 years (wild); 2-3 years (captivity)
Zebra Spider
0.200
0.250
0.900
3.00
10800
3D
Zebra Spider
Camel Spider (Galeodes arabs)
Scale illustration of an average Camel Spider compared to other spider species

They may have gained an evil reputation during the Iraqi war as voracious predators capable of devouring humans or a camel, but those are just myths about the Camel Spider (Solifugae). This spider belongs to the class Arachnida and is also called Wind Scorpion, Solifuge, or Sun spider. The Camel Spider shows characteristics of both scorpions and spiders and has a unique feeding ability of devouring prey to a pulp, then exuding digestive enzymes to liquefy the flesh. As a desert dweller, it feeds on small ground-dwelling animals and hides on scrubs. Females dig burrows which she uses to lay her eggs.

The Camel Spider has an overall legspan length between 5.51”-8.07” (14-20.5 cm). Camel Spiders have a typical body length of 2”-3” (5.1-7.6 cm), body width of .35”-.55” (9-14 mm), and body height of .43”-.67” (11-17 mm). The common lifespan of the Camel Spider is between 1-1.5 years.

Series of measured illustrations of the Camel Spider
They may have gained an evil reputation during the Iraqi war as voracious predators capable of devouring humans or a camel, but those are just myths about the Camel Spider (Solifugae). This spider belongs to the class Arachnida and is also called Wind Scorpion, Solifuge, or Sun spider.

The Camel Spider has an overall legspan length between 5.51”-8.07” (14-20.5 cm). Camel Spiders have a typical body length of 2”-3” (5.1-7.6 cm), body width of .35”-.55” (9-14 mm), and body height of .43”-.67” (11-17 mm). The common lifespan of the Camel Spider is between 1-1.5 years.

Series of measured illustrations of the Camel Spider
Camel Spider (Galeodes arabs)
Height:
.43”-.67” | 11-17 mm
Width:
.35”-.55” | 9-14 mm
Length:
5.51”-8.07” | 14-20.5 cm
Depth:
Weight:
Area:

Body Length: 2”-3” | 5.1-7.6 cm

Scientific Name
Galeodes arabs
Lifespan
1-1.5 years

Drawings include:

Camel Spider top view, side

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Tailless Whip Scorpion (Damon diadema)
Comparison illustration of the size of a Tailless Whip Scorpion to other species of scorpions

Not truly a scorpion but rather a combination of a scorpion and spider in appearance, the Tailless Whip Scorpion (Damon diadema) is a member of the arachnids found in the humid subtropical climates of both North and South America, Asia, and Africa. To survive the heat of its surrounding environment, It hides under stones and debris during the day or will even enter houses. Lacking a tail as the common name suggests, the Tailless Whip Scorpion is distinguished by its whip-like front legs that act as sensors to find both its prey and its way around at night.

The Tailless Whip Scorpion has a body length between 1”-2” (2.5-5 cm), body width of .47”-.98” (1.2-2.5 cm), body height of .26”-.53” (.65-1.35 cm), and weight between .009-.035 oz (.25-1 g). The typical lifespan of the Tailless Whip Scorpion is between 5-10 years.

Scaled collection of drawings of Tailless Whip Scorpion in various poses
Not truly a scorpion but rather a combination of a scorpion and spider in appearance, the Tailless Whip Scorpion (Damon diadema) is a member of the arachnids found in the humid subtropical climates of both North and South America, Asia, and Africa.

The Tailless Whip Scorpion has a body length between 1”-2” (2.5-5 cm), body width of .47”-.98” (1.2-2.5 cm), body height of .26”-.53” (.65-1.35 cm), and weight between .009-.035 oz (.25-1 g). The typical lifespan of the Tailless Whip Scorpion is between 5-10 years.

Scaled collection of drawings of Tailless Whip Scorpion in various poses
Tailless Whip Scorpion (Damon diadema)
Height:
.26”-.53” | .65-1.35 cm
Width:
.47”-.98” | 1.2-2.5 cm
Length:
1”-2” | 2.5-5 cm (Body)
Depth:
Weight:
.009-.035 oz | .25-1 g
Area:
Scientific Name
Damon diadema
Lifespan
5-10 years

Drawings include:

Tailless Whip Scorpion top view, side

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Giant Hairy Scorpion (Hadrurus arizonensis)
Scale illustration of an average Giant Hairy Scorpion compared to other scorpion species

Noted as the largest scorpion found in North America, the Giant Hairy Scorpion (Hadrurus arizonensis) is a species of scorpion found in the Mojave and Sonoran deserts and throughout Arizona as well as parts of California, Nevada, Utah. Within this range, it typically burrows under rocks or seeks shelter between crevices to stay cool. Its common name is derived from the tiny brown hairs along its body and tail which help it to feel the ground’s vibrations in order to catch prey. These sensing hairs along with its large size and aggressive disposition makes hunting for the Giant Hairy Scorpion an easy task.

The Giant Hairy Scorpion has an overall length between 3.94”-7.1” (10-18 cm) and weight of .14-.25 oz (4-7 g). Giant Hairy Scorpions have a body length of 1.93”-3.23” (4.9-8.2 cm), body width of .75”-1.25” (1.9-3.2 cm), and body height of .39”-.67” (1-1.7 cm). The typical lifespan of the Giant Hairy Scorpion is between 7-10 years in the wild and up to 15-20 years in captivity.

Scaled collection of drawings of Giant Hairy Scorpion in various poses
Noted as the largest scorpion found in North America, the Giant Hairy Scorpion (Hadrurus arizonensis) is a species of scorpion found in the Mojave and Sonoran deserts and throughout Arizona as well as parts of California, Nevada, Utah. Within this range, it typically burrows under rocks.

The Giant Hairy Scorpion has an overall length between 3.94”-7.1” (10-18 cm) and weight of .14-.25 oz (4-7 g). Giant Hairy Scorpions have a body length of 1.93”-3.23” (4.9-8.2 cm), body width of .75”-1.25” (1.9-3.2 cm), and body height of .39”-.67” (1-1.7 cm). The typical lifespan of the Giant Hairy Scorpion is between 7-10 years in the wild and up to 15-20 years in captivity.

Scaled collection of drawings of Giant Hairy Scorpion in various poses
Giant Hairy Scorpion (Hadrurus arizonensis)
Height:
.39”-.67” | 1-1.7 cm
Width:
.75”-1.25” | 1.9-3.2 cm
Length:
3.94”-7.1” | 10-18 cm
Depth:
Weight:
.14-.25 oz | 4-7 g
Area:

Body Length: 1.93”-3.23” | 4.9-8.2 cm

Scientific Name
Hadrurus arizonensis
Lifespan
7-10 years (wild); 15-20 years (captivity)

Drawings include:

Giant Hairy Scorpion top view, side

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Giant Whip Scorpion (Mastigoproctus giganteus)
Comparison drawing of the Giant Whip Scorpion compared to other scorpions

Also known as the Giant Vinegaroon, the Giant Whip Scorpion (Mastigoproctus giganteus) is a kind of whip scorpion found in the southern United States and Mexico. ”Whip” refers to its long, whip-like tail while ”Vinegaroon” refers to the vinegar smell of its spray (containing acetic acid) that discharges from its tail and acts as a form of defense for the scorpion when being attacked. Its long, thin tail is also used for navigation in combination with its two long front legs. In this way, the Giant Whip Scorpion feels for its prey and can then crush it with its specialized pincers or pedipalps.

The Giant Whip Scorpion has a body length between 1.57”-2.36” (4-6 cm), body width of .47”-.71” (1.2-1.8 cm), body height of .35”-.55” (.9-1.4 cm), and weight between .035-.07 oz (1-2 g). The typical lifespan of the Giant Whip Scorpion is between 4-7 years.

Set of scaled top and elevation drawings of the Giant Whip Scorpion
Also known as the Giant Vinegaroon, the Giant Whip Scorpion (Mastigoproctus giganteus) is a kind of whip scorpion found in the southern United States and Mexico. ”Whip” refers to its long, whip-like tail while ”Vinegaroon” refers to the vinegar smell of its spray (containing acetic acid).

The Giant Whip Scorpion has a body length between 1.57”-2.36” (4-6 cm), body width of .47”-.71” (1.2-1.8 cm), body height of .35”-.55” (.9-1.4 cm), and weight between .035-.07 oz (1-2 g). The typical lifespan of the Giant Whip Scorpion is between 4-7 years.

Set of scaled top and elevation drawings of the Giant Whip Scorpion
Giant Whip Scorpion (Mastigoproctus giganteus)
Height:
.35”-.55” | .9-1.4 cm
Width:
.47”-.71” | 1.2-1.8 cm
Length:
1.57”-2.36” | 4-6 cm (Body)
Depth:
Weight:
.035-.07 oz | 1-2 g
Area:
Scientific Name
Mastigoproctus giganteus
Lifespan
4-7 years

Drawings include:

Giant Whip Scorpion top view, side

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Brown Recluse Spider (Loxosceles reclusa)
Comparison illustration of the size of a Brown Recluse Spider to other species of spiders

Brown recluse spiders are a venomous spider located in North America. Brown recluse spiders only live by themselves as their name suggest, they are shy. Related to the Black Widow, if bitten by a brown recluse spider you’d need to be hospitalized. Only growing under an inch in diameter, this light brown spider can be seen with markings on their dorsal side. Brown recluse spiders only have 6 eyes compared to other spiders who have 8. They often look for dead insects because of their less eyes they cannot respond quick enough to hunt live food.

The Brown Recluse Spider has an overall legspan length between .83”-1.46” (21-37 mm). Brown Recluse Spiders have a typical body length of .28”-.47” (7-12 mm), body width of .08”-.16” (2-4 mm), and body height of .09”-.16” (2.2-4 mm). The common lifespan of the Brown Recluse Spider is between 2-4 years.

Scaled collection of drawings of Brown Recluse Spider in various poses
Brown recluse spiders are a venomous spider located in North America. Brown recluse spiders only live by themselves as their name suggest, they are shy. Related to the Black Widow, if bitten by a brown recluse spider you’d need to be hospitalized.

The Brown Recluse Spider has an overall legspan length between .83”-1.46” (21-37 mm). Brown Recluse Spiders have a typical body length of .28”-.47” (7-12 mm), body width of .08”-.16” (2-4 mm), and body height of .09”-.16” (2.2-4 mm). The common lifespan of the Brown Recluse Spider is between 2-4 years.

Scaled collection of drawings of Brown Recluse Spider in various poses
Brown Recluse Spider (Loxosceles reclusa)
Height:
.09”-.16” | 2.2-4 mm
Width:
.08”-.16” | 2-4 mm
Length:
.83”-1.46” | 21-37 mm
Depth:
Weight:
Area:

Body Length: .28”-.47” | 7-12 mm

Scientific Name
Loxosceles reclusa
Lifespan
2-4 years

Drawings include:

Brown Recluse Spider top view, side

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