Echiura

• Animal Diversity Web: Phylum Echiura  - Contains a taxonomic diagram on this animal group. With citations.
• Are Echiura Derived From a Segmented Ancestor?  - Contains an abstract of a study done on this subject. By Hessling, R. et.al. The full name of the article is "Are Echiura derived from a segmented ancestor? Immunohistochemical analysis of the nervous system in developmental stages of Bonellia viridis.".
• Biology Browser: Echiura  - Compiles online information about this phylum commonly called Burrow Worms.
• Bumblee.org Invertebrates Echiura  - Provides information on basic features of this species. With illustrations.
• Class Echiura  - Provides information on characteristics and features of this animal group. With photos.
• Comparative Toxicogenomics Database Organisms: Annelida/Echiura/Pogonophora Group  - Contains a taxonomic diagram of these animal groups.
• Echiurans  - Discusses the representatives of this animal species found in Norway. With photos.
• Introduction to the Echiura  - Provides introductory information on spoon worms. With photos.
• Investigation of Phylogenetic Relationships  - Provides a brief information on research done on this subject. From Harvard University. The title of this paper in its entirety is "Systematics and Evolution in the Echiura:Investigation of phylogenetic relationships at the intra- and inter-phylum levelsand a morphologic re-evaluation of echiurans worldwide.".
• Natural History Collections Phylum Echiura  - Provides basic facts about this animal group. With photos of specimens.
• Smithsonian Marine Station at Fort Pierce Phylum Echiura  - Contains taxonomic data on this animal group.
• Systema Natura 2000/Classification Phylum Echiura  - Features taxonomic data on this animal group.