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» Amphioxus: A Peaceful Anchovy Fillet to Illuminate Chordate Evolution - Illustrated article on amphioxus, a species which occupies a central place in evolutionary thoughts when considering the origin of vertebrates.

» Amphioxus Embryonic Development - A fascinating short movie from YouTube showing the early cell divisions in the egg and its subsequent development.

» The Amphioxus Song - A song, set to the tune of “It’s a long way to Tipperary”, that explains in verse the evolutionary development of vertebrates from invertebrates.

» Animalia: Cephalochordata - Illustration of Branchiostoma.

» Branchiostoma in coarse sand - Information on several species that live in sand at moderate depths off the coast of Devon, UK, and photographs of the lancelet (Branchiostoma lanceolatum) and the pea urchin (Echinocyamus pusillus).

» Introduction to the Cephalochordata - Illustrated description of these primitive chordates, which are small, eel-like, unprepossessing animals that spend much of their time buried in sand.

» Invertebrate Anatomy OnLine: Branchiostoma - Detailed illustrated anatomical description of amphioxus and the lancelets.

» Lancelet - Photograph of Branchiostoma lanceolatum and information from Wikipedia on the genus, traditionally known as amphioxus, its physical features and taxonomy.

» Subphylum Cephalochordata - Information on this group and the three characteristic chordate features, the notochord, the dorsal nerve cord and the pharyngeal slits.

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