. Bonner zoologische Monographien. Zoology. PANESAR, EVOLUTION IN WATER MITES. FIG. 113. Palpi of Stygomamersopsis QooV, 1974: Pal- pus of S. viedmai (top), Palpus of S. anisitsipalpis (bot- tom). Figs, from Cook (1974). It has been shown in this study that the position of the genital acetabula is not useful for the separation of families and superfamilies. In the Bharatoniinae, and in some species of the Niiotonia-group, tendencies are documented which lead to gradual incorporation of the genital acetabula into the genital flaps. In Stygo- mamersopsis the acetabula are found in the plesio- mo
. Bonner zoologische Monographien. Zoology. PANESAR, EVOLUTION IN WATER MITES. FIG. 113. Palpi of Stygomamersopsis QooV, 1974: Pal- pus of S. viedmai (top), Palpus of S. anisitsipalpis (bot- tom). Figs, from Cook (1974). It has been shown in this study that the position of the genital acetabula is not useful for the separation of families and superfamilies. In the Bharatoniinae, and in some species of the Niiotonia-group, tendencies are documented which lead to gradual incorporation of the genital acetabula into the genital flaps. In Stygo- mamersopsis the acetabula are found in the plesio- morph condition (1) clearly below the movable gen- ital flaps and (2) without enlarged basal sclerites. In Bharatoniinae and in the Nilotonia-^roup the acetabula themselves indicate the close relationship between Anisitsiellinae and other Limnesiidae sub- families. In Stygomamersopsis and Meramecia adult morphology indicates a close relationship between the two taxa, while the position of the acetabula separates them. It may be justified to shift the genus Stygoma- mersopsis next to the genus Meramecia during a revi- sion of the subfamily Neomamersinae. However, as such a revision is beyond the scope of this study, they are kept here as genus "incertae sedis" with the Ani- sitsiellinae. Genus: Psammotorrenticola Angelier, 1951 [1 spec] Typus generis: Psammotorrenticola gracilis AngeVier 1951. Material examined: /? ^rarz7« Nymphal stage; female, "F81, Corse (2B), ^93 leg. Cit & ; CRC. Location of : Toulouse. Definition (adults) Characters of the Anisitsiellinae as defined above and: • All coxae flised with the ventral shield; anterior re- gion drawn out into a long gnathosomal tube; palps at the anterior end of the camerostome are reduced in size and with most setae reduced. • Dorsal shields completely covering dorsum, but separated into an anterior and a posterior shield and 5 pairs of platelets which are situated in the dorsal furrow. •
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