. Bonner zoologische Monographien. Zoology. BONNER ZOOLOGISCHE MONOGRAPHIEN Nr. 52/2004. FIG. 20. Ground plan of segmentation of a hypo- thetical ancestor. Top: archetype of acariform mite. Bottom: actinedid mite [adapted from Weigmann (2001)]. According to Wiles (1997), in adult Hydrach- nellae there are 4 pairs of propodosomal setae, Al, A2 and Rl, R2, one pair of setae belonging to the seg- ments each carrying the coxa 2 and coxa 4 (E2, E4), while the other two (El, E3) are always reduced, and 12 pairs of hysterosomal setae (D1-D4 for dorsal setae, L1-L4 for lateral setae, and VI-V4 for ven
. Bonner zoologische Monographien. Zoology. BONNER ZOOLOGISCHE MONOGRAPHIEN Nr. 52/2004. FIG. 20. Ground plan of segmentation of a hypo- thetical ancestor. Top: archetype of acariform mite. Bottom: actinedid mite [adapted from Weigmann (2001)]. According to Wiles (1997), in adult Hydrach- nellae there are 4 pairs of propodosomal setae, Al, A2 and Rl, R2, one pair of setae belonging to the seg- ments each carrying the coxa 2 and coxa 4 (E2, E4), while the other two (El, E3) are always reduced, and 12 pairs of hysterosomal setae (D1-D4 for dorsal setae, L1-L4 for lateral setae, and VI-V4 for ventral setae). Metameric structures of the body wall are tentatively related to certain segments as given in Fig. 19. They are not related through their names to certain segments (, CI, C2 for setae on segment C) instead they are simply numbered from anterior to posterior. Wiles (1997) accepts the system of superfamilies suggested by Cook (1974) without changes. He does not discuss the potential use of chaetotaxy for the definition of superfamilies. The concept of Tuzovski (1987) The system of Tuzovski (1987) (Fig. 21) is similar to the one suggested by Grandjean (1934) and Weig- mann (2001). Here, neither anterior nor posterior segments encroach over podosomal segments. Weig- mann (2001) suggests applying a modified version of the concept presented by Grandjean (1934) for the following reasons: (1) there is no argument available why dorsal parts of elements should encroach over podosomal elements and (2) that the position of the segmental remnants does not promote such a theory. According to Tuzovski (1987), in adult Hydrach- nellae the two frontal segments (see Fig. 21 and Table 6) carry one pair of setae each (Fch, Fp), the following eight segments (V, O, H, Sc, L, S, C, P) carry an medial and an lateral seta (, Vi, Ve), while segment "H" alone carries a third seta (Hv). Five segments (O to S) carry a pair of slit organs. Differ- ent setae are reduced in diff
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