1 / 9

Cnidarian Reproduction

Cnidarian Reproduction. Asexually – budding (polyp form) Sexually –have separate male and female medusae that produce gametes that join through external fertilization to produce polyps. Flatworms - Platyhelminthes. Bilateral Symmetry Free-living in freshwater or parasitic in a host

arleen
Download Presentation

Cnidarian Reproduction

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Cnidarian Reproduction • Asexually – budding (polyp form) • Sexually –have separate male and female medusae that produce gametes that join through external fertilization to produce polyps.

  2. Flatworms - Platyhelminthes • Bilateral Symmetry • Free-living in freshwater or parasitic in a host • Has all three layers (endoderm, mesoderm, ectoderm) • Acoelomate – no body cavity.

  3. An Important Group •  Many nasty parasitic infections. Dugesia Tapeworms Flukes

  4. Flatworm Feeding • Free living flatworms are scavengers. • Parasitic flatworms use specialized structures (usually with hooks) to attach to a host.

  5. Respiration & Excretion • Excretion - Flame cells remove excess water • Respiration - Oxygen diffuses into body cells directly.

  6. Flatworm Nervous Systems • First appearance of cephalization. • Primitive brain. • Eyespots

  7. Flatworm Reproduction • Sexually - Hermaphrodites – internal fertilzation. • Asexually – fission – when damaged, regenerates new body parts. • Proglottids – found in tapeworms – each is shed off individually.

More Related