Brandon Stubbs and Tony Reeves

Period 7 5/19/09

Scientific name is Lumbricus terrestis

Classification

• One of the subclasses is Hirudinea this subclass is the leaches they have a flattened body and a posterior sucker

• The other subclass is Oligochaeta these are the worms like the night crawlers and earthworms

Body form

• They are bilaterally symmetrical

• They have a hydrostatic skeleton

• They can be from 1 mm. to 3 m. in length

ReproductionReproduction

Sexual reproduction allows a species to Sexual reproduction allows a species to better adapt to its environment. better adapt to its environment.

Most polychaete worms have separate Most polychaete worms have separate males and females and external males and females and external fertilization. fertilization.

Earthworms and other oligochaetes, as Earthworms and other oligochaetes, as well as the leeches, are hermaphroditic well as the leeches, are hermaphroditic and mate periodically throughout the and mate periodically throughout the year in favored environmental year in favored environmental conditions.conditions.

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Feeding SystemFeeding System

• Annelids have a pharynx, mouth, Annelids have a pharynx, mouth, crop ,esophagus, gizzard, intestine, crop ,esophagus, gizzard, intestine, and an anusand an anus

Circulatory systemCirculatory system

Closed circulatory systemClosed circulatory system Worms have many hearts Worms have many hearts

Respiratory systemRespiratory system

Gas exchange generally takes place Gas exchange generally takes place through the skin but can occur though through the skin but can occur though the gillsthe gills

Environment Environment

annelids are found in mostly wet annelids are found in mostly wet environments terrestrial, freshwater environments terrestrial, freshwater

Contact with humans Contact with humans Annelids came in contact by Annelids came in contact by

decomposistion decomposistion We use them for fishingWe use them for fishing

annelids

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