Jellyfish | Medusozoa

Jellyfish, also sometimes referred to as Sea Jellies, is the marine animal that is part of the Medusozoa subphylum and is known for its unusual body form. The Jellyfish has an umbrella-like gelatinous body with trailing tentacles that are used both to capture prey and defend itself. A Jellyfish swims by pulsating the top part of its body to propel itself through the water. The Jellyfish can be found all over the world and lives in both surface or deep waters. The lifespan of a Jellyfish depends on the species, but some have a lifespan of 12 to 18 months while others can live up to 20 years.

What is a group of jellyfish called?

A group of jellyfish is called a smack. A smack is also the term used to describe a slap or blow that is given by the hand either usually as a reaction. The term smack is used for a group of jellyfish as it describes what it feels like when someone is among jellyfish.

What do jellyfish eat?

Jellyfish usually eat whatever food they find as they swim through water and can fit in their mouth which includes shrimp, krill, and small fish. As a result of this process, jellyfish are considered ‘passive’ feeders since they are not actively hunting or looking for food.

How do jellyfish reproduce?

Jellyfish reproduce in 2 different ways depending on their current body form since they embody 2 different body forms throughout their lifespan, the medusa and polyps. Polyps can reproduce through asexual budding and the medusa body form reproduces through spawn eggs and sperm to reproduce sexually.

Jellyfish Guides
Browse through our curated Jellyfish Guides for additional categorizations, tips, details, variations, styles, and histories of Jellyfish. Guides provide additional insights into the unique properties and shared relationships between elements.
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2.36”-4.33” | 6-11 cm
5”-9.84” | 12.7-25 cm
17.7”-35” | 45-89 cm
6-18 months
Atlantic Sea Nettle
11.000
25.000
89.000
1.50
300
3D
Atlantic Sea Nettle
.79”-6.7” | 2-17 cm
.79”-6.7” | 2-17 cm
1.6”-13.8” | 4-35 cm
Atolla Jellyfish
17.000
17.000
35.000
1200
3D
Atolla Jellyfish
12.6”-47” | 32-119 cm
15.75”-59” | 40-150 cm
29”-108” | 74-274 cm
55-88 lb | 25-40 kg
2-6 months
Barrel Jellyfish
119.000
150.000
274.000
40.000
0.50
6400
3D
Barrel Jellyfish
8.3”-18.9” | 21-48 cm
16”-36” | 40.6-91.4 cm
44”-104” | 112-264 cm
6-12 months
Black Sea Nettle Jellyfish
48.000
91.400
264.000
1.00
350
3D
Black Sea Nettle Jellyfish
.59”-6.3” | 1.5-16 cm
.47”-3.94” | 1.2-10 cm
.59”-6.3” | 1.5-16 cm
Bloodybelly Comb Jellyfish
16.000
10.000
16.000
100
3D
Bloodybelly Comb Jellyfish
7.1”-13.8” | 18-35 cm
9.84”-17.72” | 25-45 cm
24.8”-44.9” | 63-114 cm
1 year
Blue Jellyfish
35.000
45.000
114.000
1.00
5800
3D
Blue Jellyfish
5.5”-7.9” | 14-20 cm
7.1”-9.84” | 18-25 cm
7.5”-10.6” | 19-27 cm
.31-3 lb | .14-1.38 kg
3-6 months
Cannonball Jellyfish
20.000
25.000
27.000
1.380
0.50
12000
3D
Cannonball Jellyfish
3.5”-6.3” | 9-16 cm
5.9”-10” | 15-25.4 cm
16.5”-27.2” | 42-69 cm
.44-5.3 lb | .2-2.4 kg
1 year
Compass Jellyfish
16.000
25.400
69.000
2.400
1.00
5600
3D
Compass Jellyfish
8.7”-19.7” | 22-50 cm
9.84”-23.62” | 25-60 cm
13”-30.7” | 33-78 cm
.04-.89 lb | .02-.4 kg
3-6 months
Crowned Jellyfish
50.000
60.000
78.000
0.400
0.50
5
3D
Crowned Jellyfish
.5”-5.9” | 1.2-15 cm
.8”-10” | 2-25.4 cm
1.2”-14.2” | 3-36 cm
2-6 months
Crystal Jellyfish
15.000
25.400
36.000
0.50
1500
3D
Crystal Jellyfish
.3”-.63” | .8-1.6 cm
.39”-.79” | 1-2 cm
.67”-1.34” | 1.7-3.4 cm
Darth Vader Jellyfish
1.600
2.000
3.400
40
3D
Darth Vader Jellyfish
4.7”-5.9” | 12-15 cm
4.72”-5.91” | 12-15 cm
8.3”-10.6” | 21-27 cm
4-6 months
Flower Hat Jelly
15.000
15.000
27.000
0.50
150
3D
Flower Hat Jelly
1.6”-8.7” | 4-22 cm
2.36”-11.8” | 6-30 cm
2”-10.2” | 5-26 cm
4-6 months
Fried Egg Jellyfish
22.000
30.000
26.000
0.50
2000
3D
Fried Egg Jellyfish
10.2”-41.3” | 26-105 cm
15.75”-78.75” | 40-200 cm
28.3”-143” | 72-362 cm
200-480 lb | 91-217 kg
1 year
Lion’s Mane Jellyfish
105.000
200.000
362.000
217.000
1.00
6900
3D
Lion’s Mane Jellyfish
.79”-2.75” | 2-7 cm
1.18”-3.94” | 3-10 cm
3.15”-11” | 8-28 cm
6-9 months
Mauve Stinger
7.000
10.000
28.000
0.75
2300
3D
Mauve Stinger
3.94”-9.1” | 10-23 cm
5.91”-13.78” | 15-35 cm
7.1”-16.5” | 18-42 cm
.01-.07 lb | .01-.03 kg
8-12 months
Moon Jellyfish
23.000
35.000
42.000
0.030
1.00
56000
3D
Moon Jellyfish
22”-27.2” | 56-69 cm
30”-36” | 76.2-91.4 cm
55”-67” | 140-170 cm
30-50 lb | 14-23 kg
Pink Meanie Jellyfish
69.000
91.400
170.000
23.000
1200
3D
Pink Meanie Jellyfish
2”-5.1” | 5-13 cm
4.72”-11.8” | 12-30 cm
8.7”-23.2” | 22-59 cm
1 year
Portuguese Man o' War
13.000
30.000
59.000
1.00
17000
3D
Portuguese Man o' War
3.5”-5.1” | 9-13 cm
2.95”-3.94” | 7.5-10 cm
6.7”-9.1” | 17-23 cm
Red Paper Lantern Jellyfish
13.000
10.000
23.000
5
3D
Red Paper Lantern Jellyfish
13.4”-14.2” | 34-36 cm
17.7”-19.7” | 45-50 cm
36.2”-41.7” | 92-106 cm
20-24 lb | 9-11 kg
1 year
White-Spotted Jellyfish
36.000
50.000
106.000
11.000
1.00
410
3D
White-Spotted Jellyfish
Moon Jellyfish (Aurelia aurita)
Measured comparison illustration of the size of a Moon Jellyfish to a typical person and jellyfish

The Moon jellyfish, known scientifically as Aurelia aurita, is an almost entirely translucent jellyfish which features four, distinct, bioluminescent, horseshoe-shaped gonads in its top. The Moon jellyfish is very common in northern seas, such as near Greenland, Northwest Pacific, and the Baltic sea, but can also be found outside South America. Aurelia aurita is very similar in appearance to other species in the Aurelia genus, so to truly identify an Aurelia aurita requires genetic testing. The Moon jellyfish is not an advanced swimmer and always drifts with the current, even when attempting to manually propel itself, therefore it prefers seas with consistent and mild currents, usually found inshore.

Moon Jellyfish have a bell width between 5.91”-13.78” (15-35 cm), bell height of 3.94”-9.1” (10-23 cm), and overall length of 7.1”-16.5” (18-42 cm). The typical lifespan of the Moon Jellyfish is 8-12 months with a weight between .01-.07 lb (.01-.03 kg).

Scaled collection of drawings of Moon Jellyfish in front and side poses
The Moon jellyfish, known scientifically as Aurelia aurita, is an almost entirely translucent jellyfish which features four, distinct, bioluminescent, horseshoe-shaped gonads in its top. The Moon jellyfish is very common in northern seas, such as near Greenland, Northwest Pacific, and Baltic sea.

Moon Jellyfish have a bell width between 5.91”-13.78” (15-35 cm), bell height of 3.94”-9.1” (10-23 cm), and overall length of 7.1”-16.5” (18-42 cm). The typical lifespan of the Moon Jellyfish is 8-12 months with a weight between .01-.07 lb (.01-.03 kg).

Scaled collection of drawings of Moon Jellyfish in front and side poses
Moon Jellyfish (Aurelia aurita)
Height:
3.94”-9.1” | 10-23 cm
Width:
5.91”-13.78” | 15-35 cm
Length:
7.1”-16.5” | 18-42 cm
Depth:
Weight:
.01-.07 lb | .01-.03 kg
Area:
Scientific Name
Aurelia aurita
Lifespan
8-12 months

Drawings include:

Moon Jellyfish side elevation, front, top

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Crowned Jellyfish (Cephea cephea)
Measured comparison illustration of the size of a Crowned Jellyfish to a typical person and jellyfish

The Crowned jellyfish, known as Cephea cephea, is a crown jellyfish usually found in the cold water up to 3,000 feet below the surface in the Indo-Pacific ocean. The Crowned jellyfish is purple and blue in color, bioluminescent, and has the distinctive bell shape of crown jellies. The Crown jellyfish also has warts that protrude off its body. The Crowned jellyfish is one of the most venomous jellyfish, yet not to humans; therefore, it is eaten as a delicacy and even used medically in certain Asian countries. The Crowned jellyfish, like most other jellies, has tentacles that can be used to stun and capture its prey.

Crowned Jellyfish have a bell width between 9.84”-23.62” (25-60 cm), bell height of 8.7”-19.7” (22-50 cm), and overall length of 13”-30.7” (33-78 cm). The typical lifespan of the Crowned Jellyfish is 3-6 months with a weight between .04-.89 lb (.02-.4 kg).

Scaled collection of drawings of Crowned Jellyfish in front and side poses
The Crowned jellyfish, known as Cephea cephea, is a crown jellyfish usually found in the cold water up to 3,000 feet below the surface in the Indo-Pacific ocean. The Crowned jellyfish is purple and blue in color, bioluminescent, and has the distinctive bell shape of crown jellies.

Crowned Jellyfish have a bell width between 9.84”-23.62” (25-60 cm), bell height of 8.7”-19.7” (22-50 cm), and overall length of 13”-30.7” (33-78 cm). The typical lifespan of the Crowned Jellyfish is 3-6 months with a weight between .04-.89 lb (.02-.4 kg).

Scaled collection of drawings of Crowned Jellyfish in front and side poses
Crowned Jellyfish (Cephea cephea)
Height:
8.7”-19.7” | 22-50 cm
Width:
9.84”-23.62” | 25-60 cm
Length:
13”-30.7” | 33-78 cm
Depth:
Weight:
.04-.89 lb | .02-.4 kg
Area:
Scientific Name
Cephea cephea
Lifespan
3-6 months

Drawings include:

Crowned Jellyfish side elevation, front, top

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White-Spotted Jellyfish (Phyllorhiza punctata)
Dimensioned comparison drawing of the White-spotted Jellyfish compared to other jellyfish and a person

The White-Spotted jellyfish, known scientifically as Phyllorhiza punctata, is a white bell shaped jelly with polka dots adorning its cap. The White-Spotted jellyfish is not a threat to humans as its sting and venom are very mild. The sting and venom of the White-Spotted jelly are so mild that it does not use its sting to hunt. Instead, the White-Spotted jellyfish filter feeds. Unfortunately, the White-Spotted jellyfish can filter feed in such massive quantities that it prevents other animals from being able to find food. This is problematic in areas where the White-Spotted jelly is an invasive species as these habitats do not have the jellyfish’s main predator to control its population. The White-Spotted jellyfish is native to the Pacific ocean between Australia and Japan.

White-spotted Jellyfish have a bell width between 17.7”-19.7” (45-50 cm), bell height of 13.4”-14.2” (34-36 cm), and overall length of 36.2”-41.7” (92-106 cm). The typical lifespan of the White-spotted Jellyfish is 1 year with a weight between 20-24 lb (9-11 kg).

Set of scaled elevation drawings of the White-spotted Jellyfish viewed from the front and side
The White-Spotted jellyfish, known scientifically as Phyllorhiza punctata, is a white bell shaped jelly with polka dots adorning its cap. The White-Spotted jellyfish is not a threat to humans as its sting and venom are very mild. The White-Spotted jellyfish is native to the Pacific ocean.

White-spotted Jellyfish have a bell width between 17.7”-19.7” (45-50 cm), bell height of 13.4”-14.2” (34-36 cm), and overall length of 36.2”-41.7” (92-106 cm). The typical lifespan of the White-spotted Jellyfish is 1 year with a weight between 20-24 lb (9-11 kg).

Set of scaled elevation drawings of the White-spotted Jellyfish viewed from the front and side
White-Spotted Jellyfish (Phyllorhiza punctata)
Height:
13.4”-14.2” | 34-36 cm
Width:
17.7”-19.7” | 45-50 cm
Length:
36.2”-41.7” | 92-106 cm
Depth:
Weight:
20-24 lb | 9-11 kg
Area:
Scientific Name
Phyllorhiza punctata
Lifespan
1 year

Drawings include:

White-spotted Jellyfish side elevation, front, top

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Blue Jellyfish (Cyanea lamarckii)
Measured comparison illustration of the size of a Blue Jellyfish to a typical person and jellyfish

The Blue jellyfish, known scientifically as Cyanea lamarckii, is similarly shaped to the Lion’s Many jelly with its bell shape and dense, trailing tentacles. However, unlike the Lion’s Mane, the Blue jellyfish is born pale and grows to be a striking blue color as it matures. The Blue jellyfish is also smaller than the Lion’s Mane. Preferring the open ocean, the Blue jellyfish can usually be spotted floating around the U.K. coast, the North Sea, the Irish Sea, the English Channel, along Scotland’s west coast in summer and autumn. The Blue jellyfish lives for less than a year.

Blue Jellyfishs have a bell width between 9.84”-17.72” (25-45 cm), bell height of 7.1”-13.8” (18-35 cm), and overall length of 24.8”-44.9” (63-114 cm). The typical lifespan of the Blue Jellyfish is 1 year.

Scaled collection of drawings of Blue Jellyfish in front and side poses
The Blue jellyfish, known scientifically as Cyanea lamarckii, is similarly shaped to the Lion’s Many jelly with its bell shape and dense, trailing tentacles. However, unlike the Lion’s Mane, the Blue jellyfish is born pale and grows to be a striking blue color as it matures.

Blue Jellyfishs have a bell width between 9.84”-17.72” (25-45 cm), bell height of 7.1”-13.8” (18-35 cm), and overall length of 24.8”-44.9” (63-114 cm). The typical lifespan of the Blue Jellyfish is 1 year.

Scaled collection of drawings of Blue Jellyfish in front and side poses
Blue Jellyfish (Cyanea lamarckii)
Height:
7.1”-13.8” | 18-35 cm
Width:
9.84”-17.72” | 25-45 cm
Length:
24.8”-44.9” | 63-114 cm
Depth:
Weight:
Area:
Scientific Name
Cyanea lamarckii
Lifespan
1 year

Drawings include:

Blue Jellyfish side elevation, front, top

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Flower Hat Jelly (Olindias formosus)
Scale illustration of an average Flower Hat Jelly with dimensions length compared to other jellyfish

The Flower Hat jelly, known scientifically as Olindias formosus, is a rare, multi-colored jelly that is not a true jellyfish, but rather a hydrozoa, which is a small predator that lives in colony with specialized roles between the individual organisms. The Flower Hat jelly can be found off the coasts of Japan, South Korea, Argentina, and Brazil. The Flower Hat jelly is distinctive with its translucent, pin-striped hat and coiled tentacles that drape off the edge of the cap. The Flower Hat jelly spends time both on the bottom of the sea floor and floating to hunt for prey. The Flower Hat jelly has a painful sting, usually resulting in a rash, but one death from the Flower Hat has been recorded.

Flower Hat Jellies have a bell width between 4.72”-5.91” (12-15 cm), bell height of 4.7”-5.9” (12-15 cm), and overall length of 8.3”-10.6” (21-27 cm). The typical lifespan of the Flower Hat Jelly is 4-6 months.

Pair of elevation illustrations of the Flower Hat Jelly seen from the side and front
The Flower Hat jelly, known scientifically as Olindias formosus, is a rare, multi-colored jelly that is not a true jellyfish, but rather a hydrozoa, which is a small predator that lives in colony with specialized roles between the individual organisms.

Flower Hat Jellies have a bell width between 4.72”-5.91” (12-15 cm), bell height of 4.7”-5.9” (12-15 cm), and overall length of 8.3”-10.6” (21-27 cm). The typical lifespan of the Flower Hat Jelly is 4-6 months.

Pair of elevation illustrations of the Flower Hat Jelly seen from the side and front
Flower Hat Jelly (Olindias formosus)
Height:
4.7”-5.9” | 12-15 cm
Width:
4.72”-5.91” | 12-15 cm
Length:
8.3”-10.6” | 21-27 cm
Depth:
Weight:
Area:
Scientific Name
Olindias formosus
Lifespan
4-6 months

Drawings include:

Flower Hat Jelly side elevation, front, top

Details & Downloads

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