Found it on my son's hair after a 10min visit to our veggies garden. My guess is that it might be a tick but we are not in an area of lime disease and although it's an open, rather unkept, field the only mammals I see around are 2-3 stray(?) cats.
The photo was done using a stereoscope+smartphone. The dark lines underneath are .4 to .5 mm.
Any pointers would be welcome.
Thanks! Had seen that paper once you guys pointed me to R. sanguineus and I had a chance to shower the kid.
I also found this site useful for ticks anatomy, on TicksSafety.com.