CNIDARIAHanna, Monica and Maddy

PHYLOGENETIC TREE

KINGDOM They are the first to show tissue level

organization Have no organs. The adult forms are derived from two distinct

embryonic germ layers, the ectoderm and the endoderm

Higher phyla are triploblastic

ANIMALIA Radially symmetric The end of the organism which contains the

mouth is the oral end

CHARACTERISTICS Members of this phylum live in both fresh

and salt water, have tissues and a simple nervous system, and have stinging cells called nematocysts.

They display radial symmetry and have two embryonic cell layers.

CLASSIFICATION The three classes are grouped according to

body plan. Members of the class Hydrozoa have both

the polyp and medusa stage in their life cycle.

Members of the class Anthozoa have only the polyp stage in their life cycle and are slightly more complex than hydrozoans.

Members of the class Scyphozoa have only the medusa stage in their life cycle. They are the most large and complex members of this phylum.

LIFE CYCLE

FOOD GETTING

CIRCULATION

Jellyfish do not have a specialized circulatory system.

They are able to digest with the help of the gastrodermis that lines the gastrovascular cavity where nutrients from their food is absorbed.

GAS EXCHANGE

They do not need a respiratory system since their skin is thin enough that air can diffuse in and out of their body

Jellyfish have long tentacles with a number of nematocysts inside the cnidoblast which have a trigger and a stinging apparatus.

When tentacles make contact with a fish, the thousands of nematocysts fire paralyzing toxins into their prey. When the prey is paralyzed, the tentacles move together to push it into the mouth of the jellyfish.

LOCOMOTION

The jellyfish squeeze their bodies in order to push the streams of water into a direction.

They use the velocity of their bodies as well as the weight of the water when pressure is applied to propel them.

ORGANISMS

ANEMONE

CORELS

JELLYFISH

HYDRA

CTENOPHORES

ORGANISMS OF THE CNIDARIA

CHART

  Carybdea sivickisi(BOX JELLY FISH)

FIRE CORAL PELAGIA Renilla(FLOWER ANIMAL)

KINGDOM ANIMALIA ANIMALIA ANIMALIA ANIMALIA

PHYLUM CNIDARIA CNIDARIA CNIDARIA CNIDARIA

CLASS CUBOZOA HYDROZOA SCYPHOZOA ANTHOZOA

ORDER CHIRODROPIDA ANTHOMEDUSAE SEMAEOSTOMAE

PENNATULACEA

FAMILY CHIRODROPIDAE MILLEPORIDAE PELAGIDAE RENILIDAE

GENUS CHIRONEX MILLAPORA PELAGIA RENILLA

SPECIES FLECKERI MILLEPORA ALCICORNIS

PELAGIA FLAVEOLA

RENILLA AMETHYSTINA

FOOD DIGESTIONThe cells of the gastro dermis distributes digestive acids that pour into a main cavity. The enzymes within the digestive acids begin the process of digestion, which is completed within the vacuoles when the prey is broken down and engulfed by the cells of the gastro dermis.

EXCRETION Food is excreted by diffusing through the top of the gastro vascular cavity which is also commonly known as the mouth, after the nutrients is absorbed within the body.

INTERESTING FACTS Cnidarians are radially symmetrical Cnidarians have tentacles that encircle their

mouth. To treat a box jellyfish sting, you have to pour

vinegar over the effected area. If left untreated, the venom can impair the heart and can cause death of children within 3 minutes.

Cnidaria have no brains or even central nervous systems

CHANGES IN CLASSIFICATION Cnidarians were grouped with Ctenophores in

the phylum Coelenterata, however their differences caused them to be placed in separate phyla. Cnidarians are classified into four main groups:sessile Anthozoa (sea anemones)(sea pens)

swimming Scyphozoa (jellyfish)Cubozoa (box jellies)

Staurozoa are now a class in their own rather than a sub-group of Scyphozoa.

REFERENCES http://sicb.org/meetings/2010/symposia/cnidaria.php

http://www.google.ca/imgres?q=cnidaria+phylogenetic+tree&um=1&safe=active&sa=N&rls=com.microsoft:en-ca&hl=en&tbm=isch&tbnid=vq9C83M9uZc39M:&imgrefurl=http://www.unige.ch/cyberdocuments/theses2001/KaloulisK/these_body.html&docid=PdsYdfzt32QHJM&imgurl=http://www.unige.ch/cyberdocuments/theses2001/KaloulisK/images/image002.jpg&w=392&h=382&ei=4ExxUbymGK7b4AP-84CgBA&zoom=1&biw=1024&bih=585&iact=rc&dur=172&page=1&tbnh=139&tbnw=152&start=0&ndsp=15&ved=1t:429,r:7,s:0,i:104&tx=76&ty=24

http://www.darwinsgalapagos.com/animals/cnidaria_jellyfish_coral_sea_anemone.htm

http://www.google.ca/search?rls=com.microsoft:en-ca&q=who%20belongs%20in%20the%20cnidaria%20family&biw=1024&bih=585&safe=active&surl=1&um=1&ie=UTF-8&hl=en&tbm=isch&source=og&sa=N&tab=wi&ei=ZVFxUaKIJpGn4APXloGQBA

http://animaldiversity.ummz.umich.edu/accounts/Renilla/classification/

http://en.wikipedia.org/wiki/Fire_coral

http://animaldiversity.ummz.umich.edu/accounts/Pelagia/classification/