Appendage development in embryos of the oribatid mite Archegozetes longisetosus (Acari, Oribatei, Trhypochthoniidae)

摘要: The development of reliable techniques to provide large numbers fixed mite embryos free their tough membranes has allowed us produce scanning electron micrographs oribatid for the first time. Antibody staining expression gene Distal-less demonstrates formation labrum from a pair regions in ocular lobes, indicating possible appendicular origin labrum. chelicerae are followed initial postoral position through anterior rotation become preoral. pedipalpal lobe, involved gnathosoma, is shown be almost size pedipalp at some stages, as well expressing Distal-less. fourth walking limbs not present prelarvae and larvae, however, anlage visible later embryonic stages but these do express Distal-less, suggesting that distal structures suppressed this stage. Claparede’s organs, between coxae legs I II time unequivocally derive base II. These proposed homologous lateral organs other arachnid groups.