Jan 212016
 

Our today parasite has, as indicated by the species name, a quite circular appearance. Unfortunatly, I cannot show you a global view of this species. I am really sorry but it was to big for my lowest magnification objective !

Zonurobia circularis Lawrence 1935 belongs to the family of Pterygosomatidae and has been found on Platysaurus guttatus, the dwarf flat lizard. It can be found in Nord Transvaal in South Africa.

This is probable that the author of the prepared slide is Frank J. Radowsky (1929-2010), but I am not sure. Anyway this specimen and slide is now part of the French collection MNHN, Paris.

This prepared slide is really good and we can observe many details. I particularly appreciate the scale-like setae, which reminds me the scales of a butterfly. Have you ever observed butterfly scales in a microscope ?

Gnathosoma reminds me a tick, with hypostome and chelicerae, but it is far from an Ixodida !

 

I draw your attention on peritremal tubes araising on each side of the gnathosoma. I made specially two photographies of the gnathosoma, with two different focusses.

By the way, I recommend you the following publication which shows some very good drawings of this species :

PTERYGOSOMATIDAE : DESCRIPTIONS ET OBSERVATIONS SUR LES GENRES PTERYGOSOMA, GECKOBIA, ZONUROBIA ET HIRSTIELLA (ACARI : ACTINEDIDA) M. BERTRAND, I. PAPERNA et S. FINKELMAN

If you observe carefully the description and drawings which are made of Zonurobia circularis, you may notice that my photos are showing exactly the same configuration of articles and setae…

This publication, here above in reference, mentions that Lawrence has described 5 different types of Zonurobia circularis, and this species would probably require some deaper analysis linked with the type of hosts… Zonurobia is considered by Jack (1964) as near to Pterygosoma genera. One may wonder if some described species of Pterygosoma could not be in reality Zonurobia !

I propose you to compare both genera with the following post showing Pterygosoma transvaalense.

We are at you disposal to make such analysis if you can provide us some specimens of these nice parasites !

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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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Dec 212015
 

Here are microscopic photos taken from a microscopic mount of the MNHN, Paris. This mite is Listrophoroides (Marquesania) papuanus, identified by Alex Fain from Tropical & Medical Institute of Anvers. This fur mite parasites pale field rat, known as Rattus tunneyi.

The pale field rat, also known as Tunney’s rat, is a nocturnal herbivore endemic in Australia. It once occupied almost all areas of mainland Australia, but is now found only in tall grasslands in northern Australia.

This mite species belongs to the family of Atopomelidae. Mites of the family Atopomelidae (Astigmata) are permanent parasites of small mammals. The Atopomelidae include 46 genera and about 360 species. The genus Listrophoroides (Hirst) is the largest genus of the family, including 16 subgenera and more than 150 species (Fain 1981).

 

The inscriptions on the slide shows :

  • Name of species : Listrophoroides (Marquesania) papuanus
  • Name of host : Rattus tunneyi
  • Locality : Port Warrender, Kimberly Exp.
  • Date of collection : 30-X-1976
  • Reference of slide : 50G11
  • Collection : Institut Tropical Médical d’Anvers
  • Sex : female
  • Determinator : A. Fain

If you are intereted in such species, please refer to this publication :

We can read the following concerning Marquesania subgenus :

The species of this subgenus are permanent parasites living in the fur of rats (Rodentia:Murinae) in the Oriental region, Australia and New Guinea. The atopomelids are more commensals than true parasites, because they feed on the secretions of hair glands and, probably, do not damage their hosts. After the present revision, this subgenus includes 13 species.

If you have occasion to collect such mite, we would be happy to receive some samples. We can also bring you some expertise in determination of such parasite.

Our thanks go to MNHN Paris for granting a free access to the collection. Congratulations to A. Fain and Bochkov for their great job on this genus and family !

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Dec 042015
 
Macrocheles nataliae - phoretic on Necrophorus

This mite was found hitchhiking on a Necrophorus beetle, in French Brittany in 2010. Well, I am not fully satisfied with these photos but the specialists will anyway probably recognise the Macrocheles glaber group… from the family of Macrochelidae. The problem is that the prepared slide is very slim, it is good to have a […]

Nov 252015
 
Metagynella carpathica - Deutonymph

I am proud to present you today a case of phoresy on Dorcus parallelipipedus (stag beetle also found as parallelopipedus), family of Lucanidae… Obviously the mite presented here below is a deutonymph and not an adult stage ! It was found on the French territory. Metagynella carpathica was firstly described by Balogh in 1943. The […]

Nov 082015
 
Polyaspinus cylindricus or nicolae

This new mite is obiously a Mesostigmata belonging to the Uropodina Cohort. I feel a bit uncomfortable with this Polyaspinus, considering that some authors class it in the Polyaspididae family, and others in Trachytidae family. Who owns the truth ? Where is the truth ? M. Kontschan, if you could help us your are welcome […]

Oct 102015
 
Neochauliacia simplex - parasite of Streptoprocne sonaris sonaris (bird)

I am back again with another mount from the collection of NMNH in Paris. The shown slide has the following references : Name of species : Neochauliacia simplex Peterson, Atyeo and Moss, 1978 Name of host : Streptoprocne sonaris sonaris Locality : unknown Date of collection : 1937 Reference of slide : 38F11 Collection : […]

Oct 012015
 
Spinturnix cf myoti (preadult stage) - bat parasite

Hello world, I used to go for hunting on bats, during endless nights, but for scientific purposes of courses ! No victims among bats I swear ! For this reason I am quite familiar with the mites you can find on the bat wings (or more precisely what scientists call the patagium). I am happy […]

Sep 082015
 
Pterygosoma cf transvaalense - parasite of Agamid lizard

I am back with another mount from the collection of National Museum of Natural History in Paris. The shown slide has the following references : Name of species : Pterygosoma rubi (not valid) Name of host : Agama atricolis (quoted with one “l” for atricollis on the slide) Locality : Bukavu (Democratic Republic of Congo) […]

Sep 022015
 
Asca squamulata Athias-Henriot, 1961

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 […]