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Dernières nouvelles des insectes, collemboles, myriapodes et autres arthropodes...
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[Vidéo] Une souris insensible aux piqûres de scorpion [en anglais]

[Vidéo] Une souris insensible aux piqûres de scorpion [en anglais] | EntomoNews | Scoop.it


"Mouse Impervious to Scorpion's Sting | Science/AAAS | News"


Who would win in a fight: a bark scorpion or a grasshopper mouse? It seems like an easy call. The bark scorpion (Centruroides sculpturatus) delivers one of the most painful stings in the animal kingdom—human victims have compared the experience to being branded. The 25-gram grasshopper mouse (Onychomys torridus) is, well, a mouse. But as you can see in the video above, grasshopper mice routinely kill and eat bark scorpions, blissfully munching away even as their prey sting them repeatedly (and sometimes right in the face). Now, scientists have discovered why the grasshopper mice don’t react to bark scorpion stings: They simply don’t feel them.


Evolutionary neurobiologist Ashlee Rowe at the University of Texas, Austin, has been studying the grasshopper mice’s apparent superpower since she was in graduate school. For the new study, she milked venom from nearly 500 bark scorpions and started experimenting. When she injected the venom into the hind paws of regular laboratory mice, the mice furiously licked the site for several minutes. But when she injected the same venom into grasshopper mice, they licked their paws for just a few seconds and then went about their business, apparently unfazed. In fact, the grasshopper mice appeared to be more irritated by injections of the saline solution Rowe used as a control.


Bernadette Cassel's insight:


via Pourquoi Docteur ?  "Insensible au venin neurotoxique Comment la souris sauterelle résiste à la douleur"


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Une nouvelle espèce de scorpion d'Algérie, Buthus pusillus, vient d'être décrite [en anglais]

Une nouvelle espèce de scorpion d'Algérie, Buthus pusillus, vient d'être décrite [en anglais] | EntomoNews | Scoop.it

 

Abstract:


During the last 12 years, the genus Buthus Leach, 1815 (family Buthidae) was the subject of an impressive number of studies. These concerned particularly the species belonging to the ‘Buthus occitanus’ complex. A number of populations previously consideredas subspecies or varieties of Buthus occitanus Leach were raised to the rankof species, but also many new species were described. Most of the species considered in these studies come from North Africa, in particular from Morocco, Mauritania,Tunisia and Egypt, but only one new species was recorded from Algeria. At present,one more new species of Buthus, B. pusillus sp. n., is described from the Algerian Atlas Mountains, raising the number of confirmed Buthus in Algeria to four.

 

Bernadette Cassel's insight:

 

DU MÊME AUTEUR, un article récent sur le genre Buthus (en français)

 

→ Un nouveau Buthus Leach, 1815 (Scorpiones, Buthidae) du nord du Maroc ; possible lien entre les populations marocaines et européennes http://www.scorpionworlds.fr/medias/files/buthus-confluens-lourenco-touloun-boumezzough-2012.pdf

 

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