01760nas a2200205   4500008004100000245005600041210005600097260001200153300001200165490000700177520117800184653001201362653001901374653001401393653001201407100001401419700001101433700001901444856009101463       2014                        eng d00aFine structure of the stinger aculeus in Euscorpius0 aFine structure of the stinger aculeus in Euscorpius  c04/2014  a119-1220 v423 a<p>A scorpion&#39;s last metasomal segment (telson) consists of a bulbous base that contains two venom glands and a curved tip (aculeus) where two venom ducts open to the outside. These two openings lie laterally just before the very tip of the aculeus; to see both of them at the same time, the stinger has to be looked at &ldquo;tail-on&rdquo; from the dorsal side. The two venom ducts have a distinct cuticular lining, which can be recognized in a transparent exuvia as long tubes (1 mm) extending from the distal pores back to the venom glands. Whereas the proximal bulb has many long sensory hairs on its surface, the distal aculeus is very smooth but contains small pits with tiny club-shaped hairs. These are probably contact chemoreceptors. The advantage of such sunken sensory hairs is certainly that the stinger can penetrate into prey (or foe) but can still perceive mechanical or chemical stimuli. Additionally, the aculeus bears several slit sensilla and numerous fine pores of unknown function. The aculeus is thus not only a well-adapted injection device but also contains sensory structures, which provide information on mechanical and chemical input.</p>
10aaculeus10afine structure10aScorpions10astinger1 aFoelix, R1 aErb, B1 aBraunwalder, M  uhttps://euscorpita.myspecies.info/en/content/fine-structure-stinger-aculeus-euscorpius