FIGURE 4 — Polyandrocarpa zorritensis. A in The non-indigenous stolidobranch ascidian Polyandrocarpa zorritensis in the Mediterranean: description, larval morphology and pattern of vascular budding

FIGURE 4 — Polyandrocarpa zorritensis. A, diagram showing the vascular connection between the zooid and the stolon. bw, body wall; h, heart; s, stolon; sv, stolonic vessel; t, test. B, stolon with buds. a, ampullae; b, bud; nz, developing new zooid; s, stolon; sv, stolonic vessel.