Jul 282015

Hello world ! I am the first surprised to publish photos of an Hydrachnidia. A colleague, on a French forum on insects, sent me some samples of water mite larvae collected on the Irish damselfly (Coenagrion lunulatum in the family of Coenagrionidae), in the French vulcan park in the very center of France.

We made a microscopic mount and some photos of a non gorged larva. We are happy to share the result with you.

I warmly thank Reinhard Gerecke, Andrzej Zawal & Peter Martin for their friendly help for proposing the Arrenurus genera for this mite.

The possible species are Arrenurus bicuspidator, Arrenurus tetracyphus, or another not larva described species.

At this stage, Coenagrion lunulatum species is not yet known as Arrenurus host.

More information will follow if I get some.

Thanks for your comments if any.


Apr 302015

When I look at Google image, I cannot find any image of the larva of Haemaphysalis concinna. From now on this will change. Here is in exclusivity some shots of this interesting larva.

Maybe you wonder, how did he get a larva of Haemaphysalis concinna ? Ok, I am sure there are different ways to get them, by my way is not the common one. A friend of mine captured an engorged female, the female laid eggs in captivity, the eggs hatched, and here we are. You will probably say this guy has strange friends ?

Anyway I let these pictures with one question to the world. You will probably notice a sort of capsule between legs II & III, obviously by the way, this is an hexapod larva. This capsule is at the same place than the forthcoming stigmate. Is there a link between them ? Is this pore, I do not know how to call this, is something dedicated to respiration ? It would be kind of you to tell me, if you have the answer. We have such similar capsules in different parts of the body.

By the way does the Amblyommidae family still exist or NOT ? Specialists agree between each others ?

For my education and yours some information about this species (thanks to Bristol University) :

Hosts : mainly sheep, however has also been found on; deer, cattle, horse, dog, cat and hares. (but not humans ?)

Distribution : France, Germany, Poland and that’s all ?

Do you know something precise about the biotope ?


Apr 222015

Let me start with this emblematic parasite (and mite by the way), because this is the most common tick in France, found on human I mean. I was struck by the strange beauty of these horrible parasites, when I first put one of them under the microscope. Here I focus on an observation of larva of Ixodes ricinus.

There are many images of this animal on the net, but some microscopic details, in the light microscope, are worth mentioning…

I give you a reference of a very interesting book (visible on Google books) on the topic of tick physiology :

Physiology of Ticks: Current Themes in Tropical Science published by Frederick D. Obenchain, Rachel Galun

The respiration of the nymphs and adults are through the tracheae and the spiracular plates. In the case of larva, the respiration is through the cuticle. When I am observing this strange constellation of pores on both sides of the larva dorsum, can I say that these pores are for the respiration of the larva (last image of the gallery here below) ? Or are they an opening of ducts of dermal glands ? If somebody, somewhere has the answer, let me know ! Additionally, these constellation of pores are NOT symmetrical. A sort of tick fingerprint ?

The authors mentioned here under say the following (page 13) : “Pore canals are relatively large structures and easily resolved in the light microscope, but wax canals can only be seen in the electron microscope”.

In the case of my larva, I hence suppose we see pore canals (last image of the gallery here below), but what is this very tiny punctuation we can see on the capitulum of the larva ? The punctuation is also visible on the scutum, with an underlying polygonal structure (see the two photographs of the same zone). I try to show this on the light microscope photos here below. Maybe they are the wax canals ? Anyway it shows clearly the multi-stack structure of the cuticle.

For the pleasure here are photos of the whole tick and a focus on the capitulum and hypostoma !

Thanks for your comments.