Presentation is loading. Please wait.

Presentation is loading. Please wait.

Kingdom Animalia Phylum Cnidaria. Characteristics Radial or biradial symmetry Radial or biradial symmetry Diploblastic organization Diploblastic organization.

Similar presentations


Presentation on theme: "Kingdom Animalia Phylum Cnidaria. Characteristics Radial or biradial symmetry Radial or biradial symmetry Diploblastic organization Diploblastic organization."— Presentation transcript:

1 Kingdom Animalia Phylum Cnidaria

2 Characteristics Radial or biradial symmetry Radial or biradial symmetry Diploblastic organization Diploblastic organization Mesoglea between epidermis and gastrodermis Mesoglea between epidermis and gastrodermis Gastrovascular cavity Gastrovascular cavity Nerve net Nerve net Cnidocytes – used in defense and feeding Cnidocytes – used in defense and feeding

3 Reproduction/Life Cycle Can be monoecious or dioecious Can be monoecious or dioecious Alternate generations between polyp and medusa form Alternate generations between polyp and medusa form Polyp – asexual and sessile Polyp – asexual and sessile Medusa – dioecious and free swimming Medusa – dioecious and free swimming

4 Reproduction Cont’d Planula – Cnidaria larvae Planula – Cnidaria larvae Polyps are produced by budding or planula Polyps are produced by budding or planula Medusae formed by budding from a polyp body wall Medusae formed by budding from a polyp body wall

5 Feeding Use cnidocytes to stun or kill prey Use cnidocytes to stun or kill prey Tentacles contract to bring food to mouth Tentacles contract to bring food to mouth Food is digested in gastrovascular cavity Food is digested in gastrovascular cavity

6 Support and Locomotion Hydrostatic Skeleton Hydrostatic Skeleton Some classes have longitudinal muscles that aid in movement Some classes have longitudinal muscles that aid in movement Polyps – somersault, inchworm, glide on base, and walk on their tentacles Polyps – somersault, inchworm, glide on base, and walk on their tentacles Medusae – swim and float Medusae – swim and float

7 Classification Class Hydrozoa Class Hydrozoa Class Scyphozoa Class Scyphozoa Class Cubozoa Class Cubozoa Class Anthozoa Class Anthozoa

8 Class Hydrozoa Mostly marine, but the only class with freshwater members! Mostly marine, but the only class with freshwater members! Alternate generations Alternate generations Mostly colonial polyps Mostly colonial polyps

9 Obelia Gastrozooid – feeding polyp formed from planula larvae Gastrozooid – feeding polyp formed from planula larvae Grows through budding into more gastrozooids Grows through budding into more gastrozooids Gonozooid – reproductive polyp that forms medusa by budding Gonozooid – reproductive polyp that forms medusa by budding Medusae then reproduce sexually Medusae then reproduce sexually

10 Gonozooid Gastrozooid

11 Gonionemus Medusa predominant Medusa predominant Has a velum (shelf-like lip that projects inward) Has a velum (shelf-like lip that projects inward) Velum creates jet propulsion Velum creates jet propulsion Mouth at end of a manubrium Mouth at end of a manubrium Nerve ring that coordinates swimming movements Nerve ring that coordinates swimming movements Statocyst – responds to gravity Statocyst – responds to gravity

12

13 Hydra Freshwater Freshwater Polyps only, no medusae Polyps only, no medusae Testes form sperm by meiosis Testes form sperm by meiosis Ovaries form one egg each Ovaries form one egg each

14 Physalia Portuguese man-of- war Portuguese man-of- war Colonial Colonial Cannot swim Cannot swim Cnidocytes in tentacles are lethal to small vertebrates and dangerous to humans Cnidocytes in tentacles are lethal to small vertebrates and dangerous to humans

15 Class Scyphozoa All marine All marine “True Jellyfish” – medusa dominant “True Jellyfish” – medusa dominant

16 Stinging Nettle, Mastigias

17 Aurelia Gastrodermal cells have cilia to circulate food Gastrodermal cells have cilia to circulate food Feeds on plankton Feeds on plankton Rhopalia – chemoreceptors Rhopalia – chemoreceptors Lappets – touch receptors Lappets – touch receptors Statocysts – gravity sensors Statocysts – gravity sensors Ocelli - photoreceptors Ocelli - photoreceptors

18 Class Cubozoa Medusae are cuboidal Medusae are cuboidal Polyps are reduced or absent Polyps are reduced or absent Tentacles hang from corners Tentacles hang from corners

19 Class Anthozoa Polyps only, no medusae Polyps only, no medusae Mouth has a pharynx Mouth has a pharynx Gastrovascular cavity is divided into sections Gastrovascular cavity is divided into sections Sexual and asexual reproduction Sexual and asexual reproduction

20 Sea Anemones

21 Corals


Download ppt "Kingdom Animalia Phylum Cnidaria. Characteristics Radial or biradial symmetry Radial or biradial symmetry Diploblastic organization Diploblastic organization."

Similar presentations


Ads by Google