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Pseudochactas mischi, a newly discovered living fossil

Discussion in 'Scorpions' started by miska1962, Jul 16, 2012.

  1. miska1962

    miska1962 Arachnopeon

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    Pseudochactas mischi, a newly discovered living fossil

    The discovery of the enigmatic Pseudochactas ovchinnikovi Gromov, 1998 from Central Asia and a new family, Pseudochactidae, was undoubtedly one of the most important discoveries in scorpion systematic in recent times. Now a second species of this genus has been described from south-central Afghanistan.
    The scorpion Pseudochactas mischi, named after M.Misch, who collected that new species, lives like the other Pseudochatae from Uzbekistan and Tajikistan in humid ground and is considered to be a relict of a period, when the first invertebrates left water to conquer land.
    The discovered specimen shares so many primitive characters with carbon scorpion fossils, which are not know from living scorpions

    http://www.science.marshall.edu/fet/euscorpius/fetpubl/Soleglad et al 2012 Pseudochactas mischi.pdf
     

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  2. Michiel

    Michiel Arachnoking Old Timer

    I'll bet you would have gotten more response if you had posted something about "emps", Michael:D:D

    Verstuurd van mijn GT-I9001 met Tapatalk
     
  3. Travis K

    Travis K TravIsGinger Old Timer

    Awesome post. That sure is a small species. What characteristics differentiate it from more modern scorpion species?
     
  4. callum b

    callum b Arachnosquire

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    It's a very interesting find, from a very interesting location. Do you go to Afghanistan to collect scorpions miska?!?!
     
  5. zonbonzovi

    zonbonzovi Creeping beneath you Staff Member

    "With respect to significant
    taxonomic characters, however, these three species match
    Pseudochactas in all important characters such as trichobothrial
    patterns, sternum morphology, and cheliceral and
    chelal dentition, etc."

    I'm not much for scorpions but the revelation that characters of this new species pointed to being virtually unchanged for so long is rather captivating. It makes one dream of steamy climates, the stink of sulphur & human sized arachnids...
     
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  6. desertanimal

    desertanimal Arachnoknight

  7. Anonymity82

    Anonymity82 Arachnoprince

    Definitely cool. Now, who wants to find out what that sting is like first?
     
  8. snippy

    snippy Arachnobaron

    @ zonbonzovi: The quote you gave is meant in relation to the other (all living) members of the Pseudochactidae, not to fossil scorpions. What callum b is looking for ist this:

    "Most noteworthy, the trichobothrial pattern was clearly new, not fitting into the three orthobothriotaxic patterns defined for Recent scorpions by Vachon (1974). This pattern (type D), which was first formally defined by Soleglad & Fet (2001: fig. 13) and modified by Prendini et al. (2006), proved to be basal in Recent scorpions; but see Prendini et al. (2006) for alternative hypotheses. The conclusion of Soleglad & Fet (2003b) was further supported when the trichobothrial pattern of the Cretaceous fossil scorpion Archaeobuthus was clarified (Baptista et al., 2006: 8). Other unique characters, though plesiomorphic, also provided strong evidence for the basal position of Pseudochactas. The sternum, Type 1, was shown to be very plesiomorphic in structure exhibiting no horizontal compression, showing a strong resemblance to the sternum of the Carboniferous scorpion Palaeopisthacanthus (Soleglad & Fet, 2003a: 17–18). The ventral surface of metasomal segment V is armed with a pair of ventromedian carinae, unprecedented in Recent scorpions, though reported in the Carboniferous scorpion Compsoscorpius (Jeram, 1994; see Soleglad & Fet, 2003b: 9–10, for a detailed discussion)."

    Regards
    Finn
     
  9. zonbonzovi

    zonbonzovi Creeping beneath you Staff Member

    Thanks for the correction, Finn. My enthusiasm sometimes overrides my reading comprehension;)
     
  10. Thanks for the article, very interesting find! A bit of a glance back in time...
     
  11. ecooper

    ecooper Arachnoknight