1 / 8

Annelids

Annelida - Worms Example – Oligochetes (Earthworms); Leeches; Polychaetes (marine) Worms with segmented ( ringlike ) bodies that have true coelom that is lined with tissue from mesoderm. . Annelids. Environment Oligochaetes - Soil or Fresh Water Leeches - Tropical environments

kynan
Download Presentation

Annelids

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. Annelida- WormsExample – Oligochetes (Earthworms); Leeches; Polychaetes (marine)Worms with segmented (ringlike) bodies that have true coelom that is lined with tissue from mesoderm.

  2. Annelids

  3. Environment Oligochaetes - Soil or Fresh Water Leeches - Tropical environments Polychaetes – Salt Water Food Source Filter Feeders Carnivorous - two sharp jaws used to attack

  4. External Maintaining Homeostasis – Internal • Well developed nervous system. • Brain • Several nerve cords • BEST sense organs of worms • Closed Circulatory System • Breathe thru gills • 2 kinds of waste • Digestive- passes thru anus • Cellular- nitrogen containing waste eliminated by nephridia.

  5. Movement • 2 Major groups of body muscles form hydrostatic skeleton. • Longitudinal (from front to rear) • Circular(wrap around each body segment)

  6. Reproduction • Sexually • Some use EXTERNAL fertiliziation. • Hermaphorditic (leeches)-producing both sperm and egg as needed. Worms attach to each other, exchange sperm. When eggs are ready, a citellum secrete mucus and fertilization takes place.

  7. Evolutionary Milestone • Segmented Body

  8. Pictures - Annelid Copy this drawing Or Figure 27-16 Page 697 Vocabulary- Closed Circulatory System 695

More Related