“Blue Blubber Jellyfish” (Catostylus mosaicus)

Also known as the “Jelly Blubber”, C. mosaicus is a species of Catostylid jellyfish which is widely distributed throughout coastal areas in the Indo-Pacific, including Australia. Catyostlus mosaicus is a fairly commonly encountered species and can occur in large swarms at times. Like most jellyfish C. mosaicus uses stinging nematocysts to dispatch its prey which typically consists of small fish and zooplankton. C. mosaicus has several color morphs with more southern individuals possessing a white or brown color and northern individuals sporting a distinct blue color. 


Animalia-Cnidaria-Scyphozoa-Rhizostomeae-Catostylidae-Catostylus-C. mosaicus

Image: Via Fernandez

Cassiopea ornata / サカサクラゲ(カシオペア・オルナータ)

Cassiopea ornata

カシオペア座は、一年中北極星の周りを回っていて、一日のうち半分は逆さまになっているので、サカサクラゲの学名は「カシオペア」。 Upside-down jellyfish
The constellation Cassiopeia circles the North Star all year round without setting below the horizon, so it is upside-down for half a day.
This is why the upside-down jellyfish has a scientific name of “Cassiopea”.

Animalia Cnidaria Scyphozoa Rhizostomeae Cassiopeidae
動物界 刺胞動物門 鉢虫綱 根口クラゲ目 サカサクラゲ科

The picture was taken at Kyoto Aquarium, Japan.


Mediterranean Jellyfish (Cotylorhiza tuberculata)

Also known as the Fried Egg Jellyfish, the Mediterranean Jellyfish is a species of Cepheid jellyfish that occurs in the Mediterranean, Aegean, and Adriatic Seas. Like most jellyfish C. tuberculata is a predator and will feed on zooplankton, which are dispatched via stinging nematocysts. the Mediterranean Jellyfish’s sting is mild and has little to no effect on humans.


Animalia-Cnidaria-Scyphozoa-Rhizostomeae-Cepheidae-Cotylorhiza-C. tuberculata

Images: GFDL and Antonio Sontuoso

Mangrove Jellyfish | ©Seth Patterson

An up-side down jellyfish found in Yal Ku Lagoon, Akumal, Quintana Roo, Mexico (Caribbean).

The up-side down jellyfish, Cassiopea xamanchana, does not have the typical physical characteristics of jellyfish. Often it has a somewhat green or gray/blue coloration. This display is the result of numerous densely packed symbiotic zooxanthellae, Symbiodinium microadriaticum.

The medusa, the dominant adult phase of the life cycle, possesses four branching tentacles that extend from the body, up into the water column. These structures are used in feeding and provide nutrients in combination with what is made available by the photosynthetic dinoflagellates. The large, dome shaped exumbrella of the medusa contains a central depression that is used mainly for attachment purposes as the up-side down jellyfish remains sedentary throughout a majority of its lifecycle.

Animalia - Cnidaria - Scyphozoa - Rhizostomeae - Cassiopeidae - CassiopeaC. xamachana


Spotted Jellyfish (Mastigias papua)

Also known as the lagoon jellyfish or takokurage, the spotted jellyfish is a species of jellyfish found throughout the Indo-Pacific. Unlike other jellies the spotted jelly has several small mouth openings on their oral arms instead of one large one in the middle. They also have colonies of symbiotic algae in its tissues which gives it a greenish color and food for it to eat, however they will also eat zooplankton that they catch with their arms.



Image Source(s)

Crowned Jellyfish - Cephea cephea

Scientifically named Cephea cephea (Rhizostomeae - Cepheidae), the Crowned Jellyfish, also known as Cauliflower Jellyfish, is one of three species in its genus, all found in the Indo-Pacific and East Atlantic.

Believe it or not, this beauty is targeted by the jellyfish fishing industry, especially during large blooms, and commonly and historically eaten as a delicacy or for medicinal purposes in China and Japan, along with multiple other species from its order, Rhizostomeae. 

References: [1] - [2]

Photo credit: ©Derek Haslam | Locality: Red Sea (2007)

Crowned Jellyfish - Cephea cephea

Cephea cephea is a true jellyfish (Scyphozoa - Rhizostomeae - Cepheidae) found in the Indo-Pacific and East Atlantic. It is a large jellyfish, reaching 50-60 cm in diameter, with multiple wart-like projections on top of the central mound of its bell, which is surrounded by a moat. The thin frilled skirt around the crown is used for swimming. Its main body is blue-purple, its eight oral arms are brown and highly divided into a large, curly-looking surface area resembling a cauliflower (hence this jellyfish’s other common name, Cauliflower Jellyfish).  Multiple long colorless filaments with stinging cells for capturing prey trail behind as it swims.  

Cephea cephea is targeted by the jellyfish fishing industry, especially during large blooms, and commonly and historically eaten as a delicacy or for medicinal purposes in China and Japan, along with multiple other species.

References: [1] - [2

Photo credit: ©Tanaka Juuyoh | Locality: Mactan Cebu, Central Visayas, Philippines (2005)

Haeckel’s Jellyfish - Pseudorhiza haeckeli

The Haeckel’s Jellyfish, Pseudorhiza haeckeli (Rhizostomeae - Lychnorhizidae), is a species of jellyfish native to Australian waters. This jellyfish has the body (bell) rounded and with the exterior surface covered in numerous raised lumps (bearing nematocysts). The bell is up to 40 cm across, transparent, and with brownish coarse reticular (honeycomb) pattern which gives it also the common name of Net-patterned Jellyfish. Inside the body it has a cross structure visible through transparent bell. 

References: [1] - [2]

Photo credit: ©Peter Day | Locality: Port Victoria, South Australia, Australia (2015)


Jelly Blubber (Catostylus mosaicus)

Also known as the Blue Blubber Jellyfish, the jelly blubber is a species of jellyfish that is native to the coastal regions of the Indo-Pacific. They usually remain in the coastal regions but can be found in intertidal estuaries as-well. Like most jellyfish the jelly blubber, despite its threatening name, is a predator and will feed on plankton, fish, and small crustaceans using its stinging nematocysts to dispatch its prey. These stinging tentacles can be very painful but will not cause death in humans.



Image Source(s)

Spotted jelly / タコクラゲ

Mastigias papua

タコクラゲは、体内に褐虫藻(かっちゅうそう)が共生しています。 Spotted jelly
The Spotted jelly lives in a symbiotic relationship with zooxanthellae that live in its inside of the body.

Animalia Cnidaria Scyphozoa Rhizostomeae Mastigiidae
動物界 刺胞動物門 鉢虫綱 根口クラゲ目 タコクラゲ科

Kyoto Aquarium, Kyoto, Japan.

Cassiopea andromeda / カシオペア・アンドロメダ

Cassiopea andromeda

素敵な名前だわ。 Cassiopea andromeda (Upside-down jellyfish)
Fantastic name.

Animalia Cnidaria Scyphozoa Rhizostomeae Cassiopeidae
動物界 刺胞動物門 鉢虫綱 根口クラゲ目 サカサクラゲ科

The picture was taken at Koelner Zoo, Germany.

Jelly blubber / カラージェリー

Catostylus mosaicus

A neptune-like jellyfish カラージェリー。海王星風。

Animalia Cnidaria Scyphozoa Rhizostomeae Catostylidae
動物界 刺胞動物門 鉢虫綱 根口クラゲ目 カトスチルス科

Yokohama Omoshiro Aquarium, Kanagawa, Japan.

Cotylorhiza tuberculata / コティロリーザ・ツベルクラータ

Cotylorhiza tuberculata

Cotylorhiza tuberculata - also called Mediterranean jelly or Fried egg jellyfish - is a species of jellyfish found in the Mediterranean Sea.
They have no sting effects on human because their stings are very thin. コティロリーザ・ツベルクラータは、地中海に生息するクラゲ。

Animalia Cnidaria Scyphozoa Rhizostomeae Cepheidae
動物界 刺胞動物門 鉢虫綱 根口クラゲ目 イボクラゲ科

Photo taken at Enoshima Aquarium, Kanagawa, Japan