sussexmike's picture

Spider

Observed: 3rd November 2013 By: sussexmikesussexmike’s reputation in Invertebratessussexmike’s reputation in Invertebratessussexmike’s reputation in Invertebratessussexmike’s reputation in Invertebrates
IMG_7058
IMG_7055
Description:

Fearsome looking weapons on what I assume are the pedipalps? but out of my depth. Do they help identify the spider and what are they?

Identifications
Species interactions

No interactions present.

Comments

sojr's picture

It's a boy!

Very much a beginner with spiders myself but I'm pretty sure you're referring to what is part of the male sexual organs - females have smaller palps that look a more like very short legs!

Yes, you can use the shape of the male palps to help identify many species, though you'll need someone more experienced than me to go any further with that! With females I find that the epigyne (female sexual organ found on the underside of the abdomen) are commonly used for id-ing.

If I have time I'll take a look in my book tomorrow if no-one else has given an id.

Simon

mattprince1969's picture

Normally you'd need a very close look at the palps

Normally you'd need a very close look at the palps indeed if you want to determine male lepthyphantes to species, as the critical features are tiny teeth on a part of the palp called the paracymbium - these teeth can be hard to see even under a well lit x40 dissecting microscope.

However in this case the ringed legs and multiple spines on metatarsus 1 (mt1) reduce the number of candidates considerably, of which l.minutus is the only one with such a heavy set broad spine on its palps which your pictures capture very well.

The only thing missing from the photo is the placement of the tricobothria on mt1 - but that is very difficult to see even under a x40 dissector.

Regards,
Matt

sussexmike's picture

Thanks Matt and Simon for the

Thanks Matt and Simon for the feedback and ID. Really helpful. /Mike