- Absolute Astronomy: Sipuncula
- Brief article gives overview, definition, and related terms.
- Chek Jawa: Peanut Worm
- Presents the body parts, composition, feeding and reproduction of these species. With images.
- Organisms: Sipuncula
- Contains basic information and hierarchy of the phylum. With links to chemical and gene onthology of sample species.
- Phylum Sipuncula
- Presents the taxonomic classification of the animal including years of discovery of species.
- Phylum Sipuncula and Phylum Annelida
- Presents the body structures and functions, habitat, traits and characteristics of these animals.
- Sipuncula
- Provides information on morphology, metabolism, reproduction and ecology.
- Smithsonian Marine Station - Phylum Sipuncula
- Presents taxonomic classification including class, order, family, genus and scientific names.
- UniProtKB: Sipuncula
- Features the taxonomic classification, descriptions, representative organisms and measurements. With links to details of species.
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