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    Thread: Chimerarachne yingi

    1. #1
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      Chimerarachne yingi

      A spider like arachnid with a tail from the Cretaceous period.. article Written last year.

      http://www.paulselden.net/uploads/7/...ngetal2018.pdf

      Very interesting read.
      (Over-all it has the Shape of, and has many similarities to micro whiptail scorpions - Palpigrades, with a number of differences that make it more similar to Mygalomorph and Aranae spiders.)

      bulbous Opisthosoma, and slender pedicle of spiders and tarantula,
      Chelicerae similar to true spiders
      Fangs more like Mygalamorphae
      segmented/shielded abdomen similar to amblypygi and whiptailed scorpions
      flagellum very similar to Palpigrades.

      Pedipalps more similar to Tarantula
      Though males had Tarsus of pedipalps, more similar to some Amblypygi with 4 or more spikes, 1 presumably(??) being emboli
      ... and (females simply bifricated tarsus??? Not sure if What I'm seeing/reading is an error in the article)



      One note: Both Holotype and Paratype were labeled as adult male in the paper, and this was referenced a few times even in the conclusion. however I believe the Paratype may have been supposed to be labeled as female ???

      Holotype: being specimen NIGP166870 having no emboli, bifricated tarsus of pedipalps (And what looks like an open gonoslit, or sperm receptor) should this have been labeled Female???
      Paratype: being specimen NIGP166871 rather than having bifricated tarsus, what appear to be 3 tarsal apophysis as well as tibial apophysis, presumably, the middle of the three tarsal apophysis is an ancient form of, emboli.. (upon closer inspection of thew images, the specimen also has what appears to be a sutured gonoslit, in contrast to the Holotype... These details did make it into the scientific drawings. however did not make it into the language of the article) thus revealing it to be an adult male.... (and in my mind, the holotype to be female.)

      ... If so, the sexual dimorphism would have helped in coming to the conclusion of finding such evidence of being proto-Spiders in the first place, mature males having modified pedipalps with emboli for the purpose of a 'slightly more' direct method of mating, unlike other ancient arachnids, that use a more indirect method. And this biological advent bringing forth the spiders we know today.

      If this wasn't a mistake in the article, or the entire point of the article.. ... ... then I am quite confused.
      Last edited by gregery; 04-21-2019 at 10:06 PM.
      -Greg

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