Thirty species are reported, and two of these, Echinostelium apitectum and Licea parasitica, have not been described fro其中，顶覆刺丝黏菌与寄生无丝黏菌以往未见于中国大陆之福建及邻近地区。
This fact led me to speculate that an axon could find its retinal cell neighbors in the tectum by homing in on chemical 这让我怀疑，轴突是否可以藉著活跃的顶盖神经元释出的化学物质，找到顶盖里的视网膜细胞邻居，因为它的邻居最有可能就在这条路的起点。