Photography/Images/Content/transparent-jellyfish xl.jpg Divided into 4 classes: › Hydrozoa Obelia Some are Freshwater › Scyphozoa Jellyfish › Cubozoa Sea Wasp › Anthozoa Sea Anemones CHIKA
Polyps: › Cylindrical Form › Adhere to the ground on the aboral end › Not free moving Medusa: › Flattened, mouth down version of polyp › Free moving Michelle
content/uploads/2008/05/jellyfish2.jpg&imgrefurl= lake/&usg=__BKagMTz8g47- VG4SX8EDFaL9uoI=&h=300&w=400&sz=47&hl=en&start=145&um=1&itbs=1&tbnid=UmZgcZhc KfWCvM:&tbnh=93&tbnw=124&prev=/images%3Fq%3Djellyfish%26start%3D144%26um%3D1 %26hl%3Den%26sa%3DN%26rlz%3D1R2SNNT_enUS364%26ndsp%3D18%26tbs%3Disch:1 No coelom present › No open area surrounded by body tissue Gastrovascular cavity › Digestive compartment Makana
Radial Symmetry › Radiate from center › Any plane will cut into mirror images Chika
anemone.jpg Non-centralized nerve net that coordinates movement No brain Michelle
None :[ Makana
content/uploads/2008/05/jellyfish2.jpg&imgrefurl= lake/&usg=__BKagMTz8g47- VG4SX8EDFaL9uoI=&h=300&w=400&sz=47&hl=en&start=145&um=1&itbs=1&tbnid=UmZgcZhc KfWCvM:&tbnh=93&tbnw=124&prev=/images%3Fq%3Djellyfish%26start%3D144%26um%3D1 %26hl%3Den%26sa%3DN%26rlz%3D1R2SNNT_enUS364%26ndsp%3D18%26tbs%3Disch:1 Pushes food into cavity using tentacles › Use of cnidocytes and nematocyst Food comes through mouth/anus No real, developed digestive system Chika
No real, developed excretory system Undigested remains are pushed out through mouth/anus content/uploads/2009/11/MakingJellyfishBabies1.jpg Michelle
Polyps are stationary Medusae move by passive drifting and contractions of its bell-shaped body Cubozoans actively pursue their prey Makana
No bones The Gastrovascular Cavity acts as a hydrostatic skeleton › When the volume of the cavity is filled, it can change shape Chika
Simple contractile tissues that can detect and respond to stimuli equally from all directions Some Cubozoans have complex eyes embedded in their medusa Makana
Asexual › Favorable environmental conditions › Budding and Pinching off Sexual › Deteriorating environmental conditions › Resistant zygotes that remain dormant Michelle
Dominant stage: medusa Coastal jellyfish › Alternate generations › Sexual and Asexual Reproduction Open Ocean jellyfish › No polyp stage › Sexual and Asexual Reproduction Michelle
Dominant Stage: Medusa (box-shaped) Alternate generations Asexual Reproduction Sexual Reproduction &usg=__NjTiLWiwVVdMz0zEFclRlye3884=&h=375&w=500&sz=60&hl=en&start=70&um=1&itbs=1&tbnid=L3wlsiNuLq0GDM:&tbnh=98&t bnw=130&prev=/images%3Fq%3Djellyfish%26start%3D60%26um%3D1%26hl%3Den%26sa%3DN%26rls%3Dcom.microsoft:en- US%26ndsp%3D20%26tbs%3Disch:1 Michelle
Dominant stage: polyp No medusa stage Asexual Reproduction Sexual Reproduction 871&usg=__NjTiLWiwVVdMz0zEFclRlye3884=&h=375&w=500&sz=60&hl=en&start=70&um=1&itbs=1&tbnid=L3wlsiNuLq0GDM:&tbnh=98&tbnw=13 0&prev=/images%3Fq%3Djellyfish%26start%3D60%26um%3D1%26hl%3Den%26sa%3DN%26rls%3Dcom.microsoft:en- US%26ndsp%3D20%26tbs%3Disch:1 Michelle
Lack specialized organs for gas exchange Take in gases directly from surrounding water Makana
Sea Wasps › One contains enough poison to kill 60 people Chika
Also known as Comb Jellies 8 “combs” of cilia that propel it through the water To catch prey: › If prey touches one of the two tentacles, specialized cells burst open › Covers the prey with a sticky mass Makana
Which of the following is present in Cnidarians? › A circulatory system › A nervous system › A developed digestive system › None of the above Answer: None of the above Chika
Which of the following animals is a Cnidarian? › Octopus › Sea Star › Sea Anemone › Clam Answer: Sea Anemone Makana
What type of body symmetry do Cnidarians have? › Radial Symmetry › Bilateral Symmetry › Spherical Symmetry › Asymmetric Answer: Radial Symmetry Chika
Which of the following are not one of the major classes of the phylum Cnidaria? › Scyphozoa › Cubozoa › Cephalopods › Anthozoa › Hydrozoa Answer: Cephalopods Makana