About Annelids!!

Annelids are bilateral organisms that can be scavengers, filter feeders, or blood suckers. Annelids can reproduce sexually or asexually. They range from 1mm. to 3m. There are about 15,000 modern species. The repitition of segments in an annelid is called metamerism. Annelida was split into three major groups; Polychaeta, Oligochaeta, and Hirudinea.


The animal we chose to research further for annelids are earthworms. Earthworms reproduce sexually. The unique mating behavior they have is that they exchange sperm, instead of an egg and a sperm. Earthworms are herbivores. Earthworms eat wastes of other animals. Earthworms live almost everywhere underground. The earthworm adapted to survive by digging deeper to avoid coldness.

Vertebrate or Invertebrate

Annelids are invertebrates.

Warm-blooded or Cold-blooded

Annelids are cold-blooded.

Type of Symmetry

Annelids have bilateral symmetry.