Zoological Studies

Vol. 36 No. 3, 1997

Budding Cycle and Bud Morphology of the Globe-shaped Sponge Cinachyra australiensis

Yung-Hui Chen1,*, Chang-Po Chen2 and Kun-Hsiung Chang2

1lnstitute of Marine Biology, National Sun Yat-sen University, Kaoshiung, Taiwan 804, R.O.C.
2lnstitute of Zoology, Academia Sinica, Taipei, Taiwan 115, R.O.C.

Yung-Hui Chen, Chang-Po Chen and Kun-Hsiung Chang (1997) Budding cycle and morphology of the globe-shaped sponge Cinachyra australiensis. Zoological Studies 36(3): 194-200. The asexual budding cycles of the globe-shaped sponge Cinachyra australiensis (Carter, 1886) were studied from 1987 to 1989 in the rocky intertidal area at Wanlitung, Hengchun Peninsula, southern Taiwan (2200'N, 12040'E). The small yellow buds are protruded by megascleres and are scattered over the entire surface of adults. The budding period generally started in late spring, peaked between late summer and early fall, and ended in early winter. Detached buds are oval in shape and negatively buoyant. Buds contain megascleres and microscleres similar to those of adults. At the ultrastructural level, 4 principal cell types can be identified within the buds: archaeocytes, special cells with numerous small cell inclusions, oval-shaped cells, and intermediate cells. The intermediate cells are characterized by intermediate numbers of cell inclusions and phagosomes as in archaeocytes and special cells. The oval-shaped cells are distributed more peripherally within buds than are the other 3 cell types.

Key words: Asexual reproduction, Bud, Porifera, Ultrastructure.

*Correspondence: lnstitute of Marine Biology, National Sun Yat-sen University, Kaoshiung, Taiwan 804, R.O.C.