hysterosoma

hysterosoma

[¦his·tə·rə′sō·mə]
(invertebrate zoology)
A body division of an acarid mite composed of the metapodosoma and opisthosoma.
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The genus Ledermuelleriopsis Willmann (Prostigmata: Stigmaeidae) can be easily distinguished by prodorsum covered with a large shield with 4 pairs of setae and a pair of eyes; hysterosoma covered with 3 shields (CD, EF and suranal); CD and EF each with 3 pairs of setae and suranal shield with 2 pairs of setae (Fan and Zhang, 2005).
The adult females are about 250 pm long, ovoid, pale to yellowish brown and have two pairs of setae on dorsal propodosoma; the second pair much longer than setae on dorsal hysterosoma.
If the male, on locating an achieve female, the male was found gradually climbing over the back of the female by clasping around the female hysterosoma with its first and second pair of legs, so that both pairing individuals were facing the same direction.
Body division into an anterior propodosoma and posterior hysterosoma with well marked setae was clearly visible at the stage.
The posterior end of the male hysterosoma appeared conical due to the forked nature of aedeagus.
Sexual dimorphism was quite prominent with the narrow wedge shaped and pointed hysterosoma for the male and a large, oval- rounded hysterosoma for the female.
While in quiescence, all the legs were found withdrawn beneath the hysterosoma and the individual at this stage appeared oval in shape.
The hysterosoma of the female nymph was broad and flattened while that of the male nymph was narrow and tapering posteriorly.
Propodosoma with subrectangular shield, originating behind the base of gnathosoma and extending to the anterior region of hysterosoma.
Hysterosoma separated from propodosoma by smooth striae, hysterosoma with a subrectangular median shield complemented with setae D2 measuring 12, D3 12, D4 20 and L1 11.
Hysterosoma with 4 pairs of simple setae between coxae II and distal part of the body in addition to setae of genital and anal region.
Ventral hysterosoma with 6 pairs simple setae between coxae II and distal apart of the body in addition to setae of anal and genital region in C.