| To the right of this adoral zone is a single line of preoral cilia. |
| A scorpion exuvium may include the booklung lamellae, preoral tube, and other internal features and there may be little distortion of delicate hairs, bristles, and setae. |
| Chelicerates are characterized by a pair of chelate preoral appendages and a body divided into two tagmata, the prosoma and opisthosoma. |
| At the anterior end of the preoral lobe is a nervous thickening of the ectoderm called 226 the apical plate. |
| The cilia of the preoral and postoral bands are not clearly differentiated at this stage. |
