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Figure 21
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A schematic diagram of a botryllid ascidian illustrating the main anatomical features. The ampullae are shown as well as the vessels that connect the oozooid and its bud to the ampullae. The peduncle that connects the bud to the oozooid does not disappear once the parent degenerates. Abbreviations: atrial epithelium (ae), ampulla (am), youngest bud (b), colonial vessel (clv), connecting vessel (cv), digestive epithelium (de), endostyle (en), epidermis (ep), gastric caecum (gc), heart (h), intestine (in), intestinal trabecula (it), left gastric trabecula (lgt), left peduncular vessel (lpv), mantle sinus (ms), right peduncular vessel (rpv), peduncular vessel (pv), sphincter (sp), stomach (st). No scale is provided as this is an ideographic representation. However, the zooid is estimated to be 2 mm in length, the bud 0.5 mm in length and the ampullae 0.6 mm in length. Diagram copied from Mukai, Sugimoto & Taneda, 1978.
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Figure 21
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