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Studies of Japanese compound styelid ascidians. 3. A new, possibly asexual Polyandrocarpa from Shimoda Bay


, : Studies of Japanese compound styelid ascidians. 3. A new, possibly asexual Polyandrocarpa from Shimoda Bay. Publications of the Seto Marine Biological Laboratory, 264-6: 425-436

Colonies of a strange polystyelid ascidian were cultured for 27 mo. Although no gonads appeared during the observations, this ascidian is described provisionally as a new species of Polyandrocarpa (P. stolonifera ), as it shares some very significant characters with P. misakiensis. There are 15-18 orifices, leading to the test-vessel, on the ventral side near the basal margin in adult zooids, but no net-work of test-vessels is found beneath the zooid. This feature resembles that in P. misakiensis. Four to five stolons are protruded at a time from the parent mantle wall, and usually 1 to 3 stolonic buds are formed by strobilation. Protostigmata appear first on the plain wall of the branchial sac of developing buds as in P. misakiensis. They are divided successively by formation of branchial folds and further subdivided in places to represent a composite arrangement of transversely elongated stigmata and a small number of longitudinally elongated ones.

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