ǭ�ϵ�����Ϧ�������Ǽ���ң�׽���ز������㶯���ձ鷢������Ҫ���������ʯ�౴�ࡣ������Ҫ�о��������㶯�����콸����Ҷ״���Fomitchevella ɺ��֮�����̬��ϵ����Ҷ״�彸�ڣ�С�������㶯�ﳣ��������Ҷ��Ӫ��Ư������; ����Ҷ�ܼ�����С�������㶯��Ҳ�Ѽ�������������ˮ��ѭ������ʹ���㶯�����Ի�ó����ʳ��; ��Ҷϡ�账�����㶯�����Ӵ��������ӡ��ڴ���Fomitchevella ɺ����ܽ��ڣ����㶯����Fomitchevella ֮�䲻����ʳ���ϵľ��������㶯���Dz�ΪFomitchevella �׳涨ֳ�ṩ����������Ӳ�ʻ��ף��ڴ˻���֮�Ϸ����˴���ɺ���������㶯���� Fomitchevella ����ͳֳ�׶�������̬�ռ��ܵ����޶��˾Ӵ�Ҫ��λ��

Abundant brachiopod fauna distributed widely in Pennsylvanian reefs of Xiaoyao Formation in southern Guizhou��China��in which were rich Choristites and Martinia fossils��The main attention in this paper is to the ecological relationship among brachiopod fauna and reef-building organisms: phylloid algae and Fomitchevella coral�� In phylloid algae reef��small brachiopod was sometimes discovered floatting on the algae leaf�� But it was difficult to find brachiopod in closely spaced phylloid algae��which was due to that perhaps brachiopod couldn't find adequate food when water flow became weak correlated with the prevention of phylloid algae��instead��the brachiopod increased in shape and quantity in sparse phylloid algae�� In large-sized coral reef��there was almost no competition for food between brachiopod and Fomitchevella�� The brachiopod shells provided biogenic hard substrate for attaching of Fomitchevella larvae and developed large reefs�� Brachiopods were precluded from substrate by Fomitchevella because of the limitation of ecological space��