. Bonner zoologische Monographien. Zoology. FIG. 9. Morphology of water mite larva {Rutripalpus sp.). Top left: gnathosomal base, palpi. Top right: DS. Bottom left: VS. Bottom right: anal plate. Abbre- viations on the left half of VS, DS and anal plate as suggested in this v^ork (see Chapter 4), those on the right half follow Tuzovski (1987) (for discussion of abbreviations for segmental remnants see Chapter 4). Scale =100 pm (with reference to VS and DS only) [Figs, modified from Gerecke et al. (2000)]. Gnathosoma. A short gnathosoma bears stocky pedi- palps, which have five free segments (P1
. Bonner zoologische Monographien. Zoology. FIG. 9. Morphology of water mite larva {Rutripalpus sp.). Top left: gnathosomal base, palpi. Top right: DS. Bottom left: VS. Bottom right: anal plate. Abbre- viations on the left half of VS, DS and anal plate as suggested in this v^ork (see Chapter 4), those on the right half follow Tuzovski (1987) (for discussion of abbreviations for segmental remnants see Chapter 4). Scale =100 pm (with reference to VS and DS only) [Figs, modified from Gerecke et al. (2000)]. Gnathosoma. A short gnathosoma bears stocky pedi- palps, which have five free segments (P1-P5: tro- chanter, femur, genu, tibia, tarsus) that flex ventrally. In some ancient groups P5 is relatively long and cylindrical (Hydryphantidae, Thyadinae), but it is typically reduced to a dome or button-shaped pad in most Hygrobatoidea (). A highly modified thick, curved seta is present dorsally at the end of P4. This seta is the homolog of the tibial "claw", which characterizes the pedipalp of most terrestrial Parasitengona and some related groups. The seta is secondarily reduced in several groups. The paired chelicerae, each consisting of a cylin- drical basal segment and a movable terminal claw, lie between the pedipalps. Among the Hygrobatoidea (), the basal segments are plesiotypically separate (, Sperchontidae, Teutoniidae, Limnesiidae), but they are fused in nearly all derivate FIG. 10. Morphology of water mite larva: chaeto- and solenidiotaxy of legs. Left: first leg. Right: claw (for abbreviations see text) [Figs, from Gerecke et al. (2000). Drawings refer to a larva of Rutripalpus sp.] scale bars =100 pm. Idiosoma. Plesiotypically the idiosoma is mainly un- sclerotized, as in extant Hydryphantoidea. The an- terodorsal integument bears a pair of lateral eyes each with two lenses and plesiotypically a median eye-spot and a propeltidium. The metameric structures in the idiosoma wall include plesiotypically (Fig. 9) three pairs of coxae, fo
Size: 1865px × 1340px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionbiodiversity, booksubjectzoology
