The species is not 100% sure yet, but is here placed mostly as a placeholder (the most probable identification). The possession of smooth chelicerae rules out Graecophalangium spp. and Dasylobus arcadicus (see Muranyi 2013 and 2015). On top of that, the spiny surface of the pedipalps and in a smaller degree (as it can be very variable) the color pattern point towards this species. In any case, I have kept this male and intend to examine again those characters (plus genitals) with the help of a stereoscope when I'll have more time.

This guy was just a wee red blob, but I knew it was something interesting from previous observations from up north :-)

The last image has a scale (mm and 1/2 mm divisions), the bell is about 4mm high.

It can curl up its tentacles so they are just little knobs, which it does when swimming. It can then unfurl those tentacles and drift with them extended.