Annelids, Onychophora - Annelids, Onychophora A. Annelida-...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Annelids, Onychophora A. Annelida- “little rings” 1. Segmented worms a. external- grooves b. internal- septa, transverse paddles 2. Specialization a. metamerism- the same structures repeated in each segment 3. Hydrostatic skeleton- coelom filled with fluid 4. Setae- bristle-like feet used for locomotion 5. Examples a. class: Polychaeta- “many setae,” a lot of setae on each segment, setae are poisonous b. class: Oligochaeta- “few setae,” about four pairs on each segment - Lumbricus terrestris- “earth worms,” freshwater, moist terrestrial, 100 segments, cuticle (has a mucus coating to keep moist)
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
i. circular muscles, longitudinal muscles- used in alternation for movement ii. soil- worms aerate, turn over, and fertilize soil with Nitrogenous waste iii. digestive system- mouth, pharynx (muscular- swallowing), esophagus (tube connects pharynx to stomach), stomach (crop- flexable, storage, gizzard- tough, grinding), anus (excretion of waste (1) typhlosole- fold in dorsal end of intestine,
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/07/2008 for the course BS 131 taught by Professor Smith during the Spring '08 term at University of the Sciences in Philadelphia.

Page1 / 4

Annelids, Onychophora - Annelids, Onychophora A. Annelida-...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online