2 Jellyfish

7/29/2019 2 Jellyfish

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Hydrozoan Life Cycle


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Hydra

Freshwater hydrozoanthat lacks a medusastage.

Asexually reproducesby budding from theside of polyp. Sexualreproduction occurs in

polyp stage.


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HydraAnatomy


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Brown Hyd ra Budding


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Brown Hyd ra eating


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Hyd ra Capturing Daphn i a


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Order Siphonophora Large colonies of specialized polypoid and medusoid

individuals. Various medusoid individuals form swim bell, sac floats,defensive structures, etc.

Many represent a bridge between colonial animals andcomplex organisms

Exist as colonies Within colonies are special polyps adapted to feeding,

reproduction, movement, and other functions Major predators with some consuming significant quantities

of krill

Example: Portuguese man-of-war


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Physaliaphysalis ,Portuguese man

of war(a Hydrozoan),

NOT a true

jellyfish


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Man of war: colonyof specialized medusoidand polypoid organisms;

efficient predator of krill.


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Class Scyphozoa: True Jellyfish

Fried egg jelly


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Class Scyphozoa

All marine, mostly harmless, true jellyfish Characteristics:

1. Dominant stage is medusa form.

2. Mesoglea is thicker with some amoeboidcells.

3. Incomplete digestive tract with four

branches.4. Cnidocytes in gastrodermis and epidermis.

5. Gametes are gastrodermal in origin.

Ex.Aurelia, Mastigias(Stinging nettle)


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Class Scyphozoa Range in size from smaller than

a coin to more than a meteracross with tentacles more than3 m long

Most are large planktonicorganisms that swim but alsodrift with the current

Weak swimmers, move bycontracting their rounded body,or bell

Feed on almost anything theycatch Dangerous species helmet

shaped bells, with long tentacles

and fleshy lobes from oralsurface.


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Scyphozoan Life Cycle


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Ecological Role of Scyphozoans Efficient predators of plankton, crustraceans,

fish, etc. Prey for leatherback turtle and several

species of large fishpredators move

seasonally with jellies. Plastic bags, balloons, and small trash oftenare mistaken by turtles as jellies and canharm them by obstructing their digestivetracts.


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True Jellyfish


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Red-eyed medusa


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Jellyfish at TCI


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True Jellyfish


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Jellyfish

Lions mane


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Jellyfish

Purple lions mane


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Jellyfish that break the rules Upside Down Jellyfish


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Couldjellyfish

ever be aproblem?


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Giant Jelly off Coast of Japan


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When Jellyfish are a Problem!

http://abcnews.go.com/video/playerIndex?id=9226474
http://abcnews.go.com/video/playerIndex?id=9226474http://abcnews.go.com/video/playerIndex?id=9226474http://abcnews.go.com/video/playerIndex?id=9226474


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Cyan ea cap i l la ta 7 ft. bell, 120 fttentacles; one of the largest


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Jellyfish Humor


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Class Cubozoa

Medusa is cuboidal,tentacles hang fromeach corner.

Polyps are very smallActive swimmers and

feeders in warm

tropical waters. Ex. Sea wasp, boxjellies.

Irukandji or Caruk i a ba rnes i
http://rds.yahoo.com/_ylt=A0S020xxr01MKVoAawajzbkF/SIG=1298beu46/EXP=1280246001/**http:/www.flickr.com/photos/13771169@N05/1413084061/


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Class Cubozoa: Box Jellyfish

Irukandji or Caruk i a ba rnes i

Ch i ronex f l ecke r i

Chi fl k i


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Chironex fleckerithe sea wasp


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Portuguese Man o War vs. Box Jelly fish


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Class Anthozoa

All marine, colonial (corals) or solitary (seaanemones) Characteristics

1. Lack a medusa stage.

2. Cnidocytes have no cnidocils (triggers).

3. Mouth leads to a pharynx and then to theGVC.

4. GVC is divided by mesentaries that bearcnidocytes and gonads.

5. Mesoglea have amoeboid cells

Ex Corals and sea anemones

2 Jellyfish

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