Called pedipalps, these modified legs have no direct connection to a sperm - producing organ.
They have two
smaller pedipalps -LCB- appendages near the mouth -RCB- and two jaws with fangs right next to the mouth.
The arachnids look like big, hairy spiders with an extra pair of legs — which are
really pedipalps, leg - like structures ending in an adhesive sucker, and used like arms for grasping, holding, and climbing.
Spiders need to load them before mating, for instance by ejaculating a sperm droplet and
dipping pedipalps in it, so the structures can deliver the sperm a bit like a syringe.
Like their closely related spider relatives they had eight legs and a pair
of pedipalps.
Described in a paper published in Nature Ecology & Evolution by an international team of researchers, the new creature, named Chimerarachne yingi, shares traits with a modern spider, like fangs,
male pedipalps, four walking legs and silk - producing spinnerets.
In South American deserts, the wolf spider Allocosa senex lacks such a sophisticated basket, but still carries sand out of the tunnel using
its pedipalps.
All male spiders have a pair of sex organs called
pedipalps, held like two boxing gloves in front of their face, but in this particular daddy - long - legs spider the right pedipalp was twice as large as the left.
While using
their pedipalps — the appendages next to their mouthparts — to vibrate dead leaves, they also create an audible thrumming sound.
(A) shows the final approach of the male before he inserts
his pedipalp (the sperm delivery organ) into the genital opening of the female (B).
The female bites the abdomen of the male while
the pedipalp is still attached (C).
-- «feet,» or
pedipalps, next to the front of its head.
A tick's sharp mouthparts (chelicerae and
the pedipalps) pierce the skin, and a feeding tube (hypostome) inserts into the host to extract blood.