Invertebrate Anatomy OnLine: Doliolum
- Illustrated exercise from an on-line zoology course, with information on the systematics of this Urochordate, its life cycle and its anatomy.
- http://webs.lander.edu/rsfox/invertebrates/doliolum.html

The Tunicate, Styela: A Community Housing Project
- Article by Richard Howey about tunicates, and the many organisms that made their home on the outer surface of the specimen he was examining.
- http://www.microscopy-uk.org.uk/mag/artjan03/rhstyela.html

Larvaceans
- Photographic study by Jean-Marie Cavanihac of these marine organisms.
- http://www.microscopy-uk.org.uk/mag/artsep03/jmclarva.html

Tunicates with Salad on the Side
- Essay by Richard Howey on the tunicates and their biology with a look at other organisms that also foul the hulls of ships.
- http://www.microscopy-uk.org.uk/mag/artnov98/rhtunic.html

Oikopleura's Fishing House
- Article with photographs by Wim van Egmond on this Larvacean and its delicate “house”.
- http://www.microscopy-uk.org.uk/mag/artjan01/oiko.html

Tunicate Larvae
- Photomicrograph of two tadpole-like larvae developing inside eggs.
- http://www.microscopy-uk.org.uk/micropolitan/marine/egg/frame3.html

Tunicate Eggs
- Photomicrograph of three developing eggs.
- http://www.microscopy-uk.org.uk/micropolitan/marine/egg/frame2.html

Sea Squirts: our Distant Cousins
- Article by Wim van Egmond on the life cycle and development of these Ascidians with several photographs.
- http://www.microscopy-uk.org.uk/mag/artaug98/tuni1.html

Salp
- Photograph and article from Wikipedia on this barrel-shaped tunicate, including its distribution, nervous systems, relationships and classification.
- http://en.wikipedia.org/wiki/Salp

The Salps (Class Thaliacea)
- Information from the Earthlife Web on the colony-forming Pyrosomida and the non-colonial Salpida and Doliolida, including their description and their complex life cycle.
- http://www.earthlife.net/inverts/thaliacea.html

Ascidiacea
- Photograph and article from Wikipedia on the tunicates, including their life history, fertilisation and ecology.
- http://en.wikipedia.org/wiki/Ascidiacea

Dutch Ascidian Website
- Hundreds of images of ascidian species photographed all over the world, and a few photographs of salps (Thaliacea).
- http://www.ascidians.com/

Tunicates of the West Coast of North America
- Many photographs of ascidians including both native and introduced species.
- http://convoluta.ucdavis.edu/gallery/view_album.php?set_albumName=West_Coast_Tunicates

Tunicates Extraordinaire
- Interesting personal account by Jean-Marie Cavanihac of her observations on the eggs and larval stages of the Ascidians and Botryllus, accompanied by excellent photographs. Further accounts of Salps, Doliolids and Larvaceans with more photographs and vide
- http://www.microscopy-uk.org.uk/mag/indexmag.html?http://www.microscopy-uk.org.uk/mag/artdec00/tunicp1.html

Urochordata
- Introduction to the Urochordata, with photos.
- http://www.ucmp.berkeley.edu/chordata/urochordata.html

Archives of Tunicata E-mail List
- Subscription information and archives.
- http://www.jiscmail.ac.uk/lists/tunicata.html

Ascidian Home Page for the United States
- Home page for Ascidian News, a twice yearly newsletter published by Charles and Gretchen Lambert, with recent worldwide publication citations, meetings abstracts and work in progress. The Ascidiaceae are a family in the Phylum Urochordata and are commonly
- http://nsm.fullerton.edu/~lamberts/ascidian/

Just Blue
- South African organization conducting research on the ascidians or tunicates, commonly known as sea squirts, mostly for the Coral Reef Research Foundation. Website contains many photographs of tunicates.
- http://www.justblue.co.za