- About Caecilians (Order Gymnophiona)
- Presents unique features and characteristics. With links to related sites.
- Amphibian Species of the World Gymnophiona Muller, 1831
- Presents data on synonymy, English names and distribution of member species.
- Animal Diversity Web Order Gymnophiona (Caecilians)
- Presents a taxonomic listing for this amphibian group.
- Biology Browser: Gymnophiona
- Provides links to information on this amphibian group and its subgroups.
- Caecilians (Gymnophiona)
- Presents description and unique features of member species. With images.
- Earthlink.net Order Gymnophiona (Apoda)
- Presents a listing of member species. With references.
- Gymnophiona Caecilia Apoda General Links
- Provides a listing of families and member species.
- Gymnophiona.org
- Offers information on the group dedicated to providing accurate data on these amphibians.
- Gymnophiona: Herpetology
- Offers links to images of member species.
- Gymnophionas of the World
- Provides information on distribution and member species. With references.
- Histology of the Trachea and Lung of Siphonops annulatus (Amphibia, Gymnophiona)
- Gives abstract of study by Kuehne, B. and Junqueira, L.C.U. with links to full text or PDF versions.
- InfoNatura Species Index Families in Order Gymnophiona
- Provides a listing of member species. With links.
- Innvista.com Gymnophiona
- Provides a listing of member species.
- ITIS Report: Gymnophiona
- Details taxonomic data, references, comments, and off-site resources.
- Kinds of Gymnophiona Caecelians of the World
- Offers a listing of member species.
- Livingunderworld.org Amphibia: Gymnophiona, or Apoda
- Presents unique features and distribution. With images and links to related sites.
- Mexico Herpetology Gymnophiona
- Information on member species found in the area. With images.
- Mikko's Phylogeny Archive Gymnophiona Caecilians
- Presents a taxonomic tree for this amphibians. With references.
- Peptidases of the Order Gymnophiona
- Information on protein sequences for these amphibians.
- Taxonomicon Order Gymnophiona Rafinesque-Schmaltz, 1814
- Presents the taxonomic hierarchy for this amphibian group.
- University of Texas at Arlington Gymnophiona
- Offers images of member species.
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