Jan 012016
 

Hello world ! Mites and Parasites wish you a happy new year 2016 ! We wish you as few parasites as possible, unless for scientific studies… We wish you nice discoveries and wonderful photos of microworld !

As the new year is always an opportunity to take good resolutions, then I will suggest myself, for year 2016, to show you more oribatid mites… this is one of my weak points ! So to show you that I am working on my 2016 resolution, I show you, for the first post of this year, an oribatid mite extracted from the collection of MNHN, Paris !

Have you ever heard about ptychoïd oribatids ? Ptychoïdy is a mechanical defence in some groups of Oribatida, where the animals can retract their legs into the idiosoma and encapsulate. For this reason they are commonly called box mites. Our today subject is Euphthiracarus crassisetae, nearctic oribatid mite. This mite is belonging to the family of Euphthiracaridae.

 

Euphthiracarus polytretos is the name indicated on the prepared slide mounted by Professor Walker. It is a former synonym of Euphthiracarus crassisetae, according to World catalog of Oribatid mites from Subias. Subias is a real phenomenon for having performed such an exhaustive catalog of world oribatida. He has our full respect !

The inscriptions on the slide show :

  • Name of species : Euphthiracarus polytretos
  • Biotop : partly decayed coast, reduced stump, litter, humus, soil
  • Locality : Smith river Del Norte Co., California
  • Context : Fort Hays Studies
  • Reference of slide : 47D4
  • Mounting media : Euparol
  • Sex : male
  • Determinator : Walker
  • PARATYPE

In relations with this specimen, I found the following reference on the net : Walker, N.A. (1965): Euphthiracaroidea of California Sequoia Litter: with a reclassification of the families and genera of the world (Acarina: Oribatei). Fort Hays Studies, New series, Science series 3: 1-154.

As I am interested in etymology, I will stress the point that crassisetae means thick setae… One of these short and thick setae appear on the shown images.

On the enclosed photomicrographs you can notice :

  • Details of cuticle with smart little circles,
  • Detail of club-shaped sensilium,
  • Detail of gnathosoma, you can notice that the lateral part of gnathosomal capsule is not ornamented,
  • The shown chelicera is part of a second mout with dissected parts of Euphthiracarus crassisetae.

Once again we wish you a Happy New Year 2016 !

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Sep 022015
 

Hello world,

We are back after a period of vacations. We took advantage of the vacations to visit the famous National Museum of Natural History in Paris. At this occasion, with the kind permission of NMNH (MNHN of Paris in French), with took some photographs of forgotten treasures…

To start with a serie of specimens directly from the collection of NMNH in Paris, here is Asca squamulata, firstly described by Athias-Henriot in 1961.

This mount is of great interest, because it shows a syntype of Asca squamulata. As you may know, a snytype is quoted in the first description of a new species, in other words in the protolog of the species.

We hope you will appreciate this species from the Ascidae family.

We warmly thank NMNH in Paris and Mark Judson for allowing us visiting the collections.

 

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