By Heinz Mehlhorn Professor Dr. (eds.)
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The central syncytium (cs) harbours condensed nuclei (cn) and a few decondensed nuclei (dn). The epidermal syncytium (es) forms most of the body including fused crypts of the outer membrane which contain round electron-dense granula. The surface of the larva is armed with hooks (h) and body spines (sp). The two retractor muscles (r) enable the larva to perform invaginations of the anterior body. ). Mature acanthors of acanthocephalans are enclosed by four eggshells separated by interstices with granular electron-lucent material in it (Fig.
The section has been treated according to the electron microscopical PAS-staining method by ThiØry. Note the mucus-like carbohydrates inside (CM: crypt of the hook's outer membrane) and outside the hook (arrow). x 56,000. A B proboscis cavity the tegumental surface including the hooks appears as a labyrinth with remnants of host cells and tissue between its curves and with grease occupying all external niches of the labyrinth at its bottom plane. In Archiacanthocephala the proboscis cavity is not filled with grease in its inner part and the la- byrinth is lined by the fuzzy ?
1, ? Ixodes/Fig. 1, ? Mites/Fig. 1, ? Neotrombicula autumnalis/Fig. 1). Chelicerae may appear needle-like for piercing the skin of hosts or toothed (as in ticks) for anchoring to the integument of the host. System The classification of the Acarina, which as adults have four pairs of legs, is still a matter of controversy; with respect to the parasitic stages, the following system, which is based on the location of the openings of the tracheal system (stigma or spiracle), covers all parasitic species: Subphylum: Chelicerata Class: Arachnida Order: Acarina Suborder: Metastigmata (ticks; large species with recurved teeth, a pair of tracheal spiracles is located behind third or fourth coxae) Family: Argasidae (?