苔藓动物类...

Bryozoa was quite diversified in the Ordovician, but lacked fossil records in the Cambrian.古生物学资料表明,虽然苔藓动物的大多数类群在奥陶纪已经分化出来, 但它在寒武纪却缺乏任何化石记录....

Bryozoa的音标：...