Pionopsis Lutescens
Description and identification of a Pionopsis Lutescens female found the 24 April 2011 in Saint Martin Au Laërt
Key utilised : Flatford Hopkins P58 + fig 49-51-57
Size : between 1.5mm and 2mm.
Interesting element used for the identification.
- Anchoral process of the capitulum very specific.
- Anchoral process of the first coxa.
- Shape of the 3rd and 4th coxae plates.
- Global color scheme. The red color of the back spot is due to a bad white balance setting on my camera.
- The shape of the 3 acetabula.
Discussions.
In « British Hydracarina », Soar and Williamson didn’t mentionned the 2 sclerites visible on the back, in front of the anterior strip.
References.
- agroeconet : in russian.
More pictures.
Pionopsis Lutescens female ventral view
Pionopsis Lutescens female lateral view & palp
Pionopsis Lutescens female genital area
The 2 sclerites and the spot of the back
I think I found the same species, but I think this is Tiphys ornatus (a rather common watermite in Holland). Look at my website, I added it some days ago. I must still add the pictures of the epimera and genitals. I could send you a picture of drawings from Viets, Besseling and Davids if necessary.
You may be right Gerard. I’ve just checked in Viets 1936. The disposition of the acetabula is more like Tiphis Ornatus but the genital area of Tiphys seem nearest to the 4th coxa and the gap between the 3rd and 4th is narrower on Tiphys and much wider on Pionopsis. I haven’t Besseling and Davids illustration of these species.
Yann, the drawing in Viets 1936 is that of a young female (as noted under the drawing). I too was puzzled by the narrow space you mention on his drawing, but I expect it get’s wider as the body of the female « inflates » (when the eggs grow). I will post my picture of the underside of my specimen on my site a.s.a.p.
critères systématiq
ue de pionopsis