TY - JOUR JF - Acarologia T1 - Morphology and function of the gnathosoma in the Histiostomatidae (Astigmata) VL - 46 IS - 1-2 SP - 103 EP - 109 PY - 2006 SN - 0044-586X SN - 2107-7207 PB - Les Amis d'Acarologia AU - Wirth, S. UR - https://www1.montpellier.inrae.fr/CBGP/acarologia/article.php?id=1900 DA - 2006-12-29 KW - Acaridae KW - gnathosoma KW - coxal endites KW - Histiostomatidae KW - palparmembrane AB - Studies on the characters of the gnathosoma, among other details, establish the Histiostomatidae to be a monophyletic group and the Guanolichidae to be its sister group. A synapomorphy of Guanolichidae and Histiostomatidae is the reduction of the digitus mobilis of the chelicerae to small remnants. For the first time a reconstruction of histological sections of internal structures of a histiostomatid gnathosoma, namely of Histiostoma palustre Wirth, 2003, is presented. The coxal endites are laterally connected with the pedipalps and close the ventral gnathosoma completely. An apomorphy of the Histiostomatidae and an important structure for comparative studies is the palparmembrane which is shaped distally by the coxal endites. ER -