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Amphibians on the IUCN Red List (formerly the Global Amphibian Assessment): http://www.iucnredlist.org/amphibians. A valuable website that provides maps drawn by regional experts for all species of amphibians as well as comprehensive information on conservation status. This is a canonical site for conservation information. See Ficetola, Rondinini, Bonardi, Padoa-Schioppa, and Angulo, 2014, J. Biogeograph., 14: 211-221, for discussion of accuracy.
AmphibiaWeb: http://www.amphibiaweb.org/. Largely an aggregator website with information from, e.g., IUCN, iNaturalist, NatureServe, HerpNet, and ASW, although with some original content, which is directed at the informed public and provides information amphibian conservation, population declines, as well as other general information about and images of many amphibian species. The taxonomy employed tends to lag mildly to severely.
ARKive. Images of Life on Earth (Amphibia page): http://www.arkive.org/amphibians/. This website is dedicated to informing the public about threated amphibians (and all other threatened species as well) via multimedia. Explore and search for videos, photos, and facts about endangered species. Arkive is an IUCN partner.
Bibliomania Herplit Website: http://herplit.com/herplit/. Although not comprehensive, Breck Bartholomew's literature database is very useful for those needing ready access to bibliographic citations.
Biodiversity Heritage Library: http://www.biodiversitylibrary.org/. A remarkable free online source of biodiversity publications that are out of copyright and many (e.g., KU series) that are still in copyright.
CalPhoto Images: http://calphotos.berkeley.edu. A great resource for images, maintained by Biodiversity Sciences Technology (BSCIT), part of the Berkeley Natural History Museums at the University of California, Berkeley.
The Center for North American Herpetology: http://www.cnah.org/. A great place to start to access much herpetological information and downloadable literature with reference to the United States.
Encyclopedia of Life (Amphibia page): http://www.eol.org/pages/1552. Potentially an amazing resource, but currently lags behind other websites. The tie-in to the Biodiversity Heritage Library will make this site very useful for professionals.
Google: http://www.google.com/. The fastest way to locate information, albeit disorganized, on any taxon is to search for it on Google. But, like any unvetted information source errors abound.
iNaturalist.org: http://www.inaturalist.org/taxa/20978-Amphibia. A website that provides access to a lot of online information about amphibians. It has a large aggregator function (see warnings below about Wikipedia and Wikispecies), but the core iNaturalis site is very interesting. The mapping and making-your-own-observations functions are impressive. iNaturalist is an IUCN partner
ITIS (Integrated Taxonomic Information System: ITIS Amphibia record) and the Catalogue of Life: http://www.catalogueoflife.org/). ITIS is a United States Department of Agriculture system for storing information on all organismal names. The Catalogue of Life is a taxonomic summary of ITIS information available through a relatively user-friendly interface. LSIDs of all of the taxon names are available through the Catalogue. This is also the source of the taxonomy employed in the Encyclopedia of Life.
Lisanfos KMS: http://www.lisanfos.mncn.csic.es/?module=searches (http://www.lisanfos.mncn.csic.es/?module=taxones_search for database access). An extremely valuable internet resource on fossil lissamphibians provided by Borja Sanchiz and Carolina Martín at the Museo Nacional de Ciencias Naturales, Madrid, Spain. This remarkable website provides high-quality information on fossils notably absent from ASW and should prove to be a valuable resource to all professionals needing timely access to information on fossil taxa.
Mikko's Phylogeny Archive: http://www.helsinki.fi/~mhaaramo/metazoa/deuterostoma/chordata/amphibia/lissamphibia/lissamphibia.html . A useful site for access to phylogenetic information and comparisons of different taxonomic arrangements, although increasingly out of date.
National Amphibian Atlas: http://igsaceeswb00.er.usgs.gov:8080/mapserver/naa/. This site contains reasonably good maps of the distributions of amphibians in the United States, although in some cases counties seem to be the unit of occurrence, and without accompanying text it is difficult to evaluate the sometimes significant differences between these maps and those in the more traditional field guides.
Scientific and Standard English Names of Amphibians and Reptiles of North America North of Mexico: http://www.ssarherps.org/pages/comm_names/Index.php. The recommended English names of the three major herpetological societies in North America (Society for the Study of Amphibians and Reptile, Herpetologists' League, and American Society of Ichthyologists and Herpetologists), with comments on taxonomy.
Translations of the Scientific Names of the Reptiles and Amphibians and Amphibians of North America: http://ebeltz.net/herps/etymain.html. Lots of interesting and helpful biographical and etymological information on USA and Canadian amphibian and reptile names from the indefatigable Ellin Beltz.
Tree of Life: http://tolweb.org/tree?group=Living_Amphibians&contgroup=Terrestrial_vertebrates. This site (not associated with the NSF Assembling-the-Tree-of-Life Program) provides a basic source of information regarding the evolutionary history for all major taxa of amphibians optimized on educational outreach. The contents and badly "under construction" and substantially out of date in most amphibian groups. A great concept, however.
VertNet: http://portal.vertnet.org/. This site ties together collection data for most of the important online herpetology collections. Results, especially the maps, should be carefully interpreted by an expert systematist prior to use for scientific purposes, as collections vary in the nomenclature adopted for purposes of warehouse management.
Wikipedia: http://www.wikipedia.org. The English version is largely a source of taxonomic misinformation and/or dysinformation. (I have tried to fix some of the egregious propaganda, only to find the dysinformation back again the next day, suggesting the anonymous involvement of deeply unethical people.) Caveat emptor! Having written that I must comment on the fact that the French and Spanish versions of Wikipedia (http://fr.wikipedia.org/ and http://es.wikipedia.org/, respectively) seem to be doing a much more responsible job towards taxonomy generally and amphibians specifically than does the English language version.
Wikispecies: http://species.wikimedia.org/wiki/Main_Page. A website that intends to have a page for every taxon. Unfortunately, like Wikipedia, although it is improving, a significant amount of the content related to amphibian systematics is either poorly researched or is simply misinformation. Caveat emptor!