Gnathostomulids have no known fossil record, though there are (debatable) similarities between the jaws of modern gnathostomulids and certain conodont elements.
Gnathostomulids have no fossil record.
Gnathostomulids have no fossil record.
简化这句话: Gnathostomulids have no known fossil record, though there are (debatable) similarities between the jaws of modern gnathostomulids and certain conodont elements. 输出: