 American paleontologist Alfred <unk> brought the name <unk> back into use in the later 20th century . <unk> @-@ <unk> used the name <unk> in a strict sense ( <unk> <unk> ) to refer to <unk> and <unk> , excluding <unk> . <unk> agreed with this classification , but used the name <unk> to avoid confusion with <unk> in its wider sense ( <unk> <unk> ) . Unlike modern <unk> classification , however , <unk> included the primitive <unk> in the group . 
