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- Amfora; M. Montens; imagery of ascidians in the Netherlands.
- Aquadonna Diving; photographer unknown; imagery of ascidians in the Netherlands.
- Ascidacia.com; K. Sanamyan, D. Schories, and H. Krumbeck; imagery of ascidians.
- Ascidians.com; A. Gittenberger; imagery of ascidians. Dutch Ascidian Website.
- Ascidiacea, sea squirts; F.E. Moen and E. Svensen; imagery of ascidians in Norway.
- Ascidiacea; University of the Azores; imagery of ascidians in the Azores.
- Encyclopedia of Marine Life of Britain and Ireland; B. Picton; imagery of ascidians in the United Kingdom.
- Faunal Inventory of Zeeland, Netherlands; R. Sheridan and J. Mallefet; imagery and geographic distribution of ascidians in the Netherlands.
- Kelp Forest Ecology; UC Santa Cruz; S. Lonhart; imagery of ascidians in California.
- Life at the Edge of Reef; M. Boyer and P. Bearzi; imagery of ascidians in Indonesia.
- Netherlands, Zeeland; R. Offermans; imagery of ascidians in the Netherlands;Didemnum sp. = druipzakpijp.
- Netherlands; photographer unknown; imagery of ascidians in the Netherlands.
- Ocean Photo; E. Svensen; imagery of ascidians in Norway.
- Onderwaterwereld; D. van Vliet; imagery of ascidians in the Netherlands; select Soortenlijst, then Druipzakpijp (= Didemnum sp.).
- San Francisco Estuary Institute, San Francisco Bay Exotics Guide.
- Stichting ANEMOON (ANEMOON Foundation); imagery and geographic distribution of ascidians in the Netherlands; select Biologie, then Zakpijpen Tunicata, then Druipzakpijp Didemnum sp., then Verspreiding, Trends, etc.
Note: In searching for didemnid occurrences in the Netherlands, try zakpijp (=tunicate) and druipzakpijp (=Didemnum sp.).
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U.S. Department of the Interior |
U.S. Geological Survey
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