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None Provided48 Hootan Tabesh 203049772 Sabellaria cementarium belongs to the phylum Annelids and is an invertebrate polychaete species. They are found in small clumps at the rocky bottoms of the sea floor where they use the rich source of natural phytoplankton as their primary diet (Qian and Chia, 1990). The tube-like worms can behave social and form extensive reefs or independently build hollow tubes in to the sandstone (pawlik and Chia, 1991). Embryos form a polar lobe that is absorbed in to the blastomeres at the end of division. Larval development and movement follows shortly after the 14-15 hour fertilization period where spiral cleaving of the fertilized oocytes appears (Render, 1983). Much is still not known about the invertebrate worm in their natural niche. The understanding of Saballaria cementarium's diet has not been thoroughly examined in much detail. Qian and Chia (1990) examined the role of detritus, form of eelgrass, as a food source for developing larvae of the organism. It is not known whether they are food limited. The experiment was conducted to reveal some facts about the feeding habits of the larvae in determining the development and growth of it. The invertebrate larvae's primary food source comes from the phytoplankton that is found in abundance at the bottom of the sea floor. The larvae fed with detritus were compared with those fed on equal concentrations of phytoplankton. Other tests were conducted to compare the degrees of survivorship among the larvae using varying concentrations of phytoplankton. Higher concentrations of phytoplankton, consumed by the larvae, yielded higher survivorship in growth and development among them. The results showed that there were no major alterations in growth and development of the larvae when fed with detritus. The results suggested the potential of detritus as a possible food source for the larvae. This would insignificantly limit the extent of growth and development among the larvae. The study concluded that larvae of Sabellaria cementarium are capable of changing their diet and thus utilizing detritus as a food supply (Qian and Chia, 1990). Pawlik, J. R. and Chia, F. S. 1991. Larval settlement of Sabbelaria cementarium Moor, and comparisons with other species of Sabellariid polychaetes. Canadian Journal of Zoology, 69:765-770. Qian, P. Y. and Chia, F. S. 1990. Detritus as a potential food source for polychaete larvae. Journal of Experimental Marine Biology and Ecology, 143:63-72. Render, J. A. 1983. The 2nd polar lobe of the Sabellaria cementarium embryo plays an inhibitory role in apical tuft formation. Wilhelm Roux's Archives of Developmental Biology, 192:120-129. Bibliography:

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