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Pionacercus cf. vatrax 24-05-2015
Pionacercus cf. vatrax
(Composition of four photos)

Pionacercus is one of the watermite genera that resemble Piona genera, but differ in having only three acetabula on each of the two genital plates. Other genera like that are Tiphys and Pionopsis. Pionacercus vatrax is found in Europe and rather common in the Netherlands in spring (Smit & van der Hammen, 2000). The female specimen presented here was found in may 2015 in a small, slowly flowing canalised stream which wasn't very clean, near the city of Deventer.
Pionacercus indruk door loupe 24-05-2015With its small size (0.85 millimeters) this watermite was a rather inconspicuous little dot between the lumps of algae and detritus. With a loupe the appearance is as on the picture at left. On the top side of the mite, the bright yellow stain of the excretory organ remind of that of Forelia, but on that species the dark patches are not as broad. Only the underside shows the typical characteristics of Pionacercus.

Pionacercus vatrax is a species of ditches and normalised brooks, with enough plants and moderate eutrophic water, according to literature (Smit & van der Hammen, 2000). The stream mentioned appeared to match that description. At the time of sampling the water was shallow and there were lots of tadpoles. Below are two pictures of the stream, the mite was caught in the part shown on the right picture.

Stream near Bussloo 24-5-2015
Stream near Bussloo 24-5-2015





Click on the picture below for the next page.

Pionacercus cf. vatrax 24-05-2015
the bottom side



References:

See the watermites REFERENCE LIST.



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COPYRIGHT:
All pictures on this site were made by Gerard Visser (Almelo, Netherlands), unless stated otherwise. All rights remain with him. These pictures may not be used for purposes any other than private viewing or printing. Do NOT hardlink to these pictures or place them on other websites without the author's approval. Should you need them for purposes which include third parties, you must ask the author permission by e-mail. People, who want to use this pictures for exhibitions or publications or educative material are much encouraged to do so, after approval as mentioned and giving the normal credits.
© G.H. Visser 27-05-2015
rev. 09-06-2015

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