Sunday, 15 October 2017

Titanonarke megapterygia: A new species of Electric Ray from the Early Eocene of Italy.

Electric Rays, Torpediniformes, which get their name from their ability to produce bioelectricity, used to both capture prey and deter predators, with some species said to be capable of producing a shock equivalent to dropping a hairdryer into a bathtub. They are highly distinctive with a rounded disk and a flattened muscular tail; Electric Rays are poor swimmers, but lacking any natural enemies, this is not usually an issue. Based upon their relationships to other Rays, they are assumed to have first appeared during the Cretaceous, though fossil Electric Rays are only known from post-Cretaceous deposits. As with other Chondrichthyans (Sharks and Rays) almost all fossil Electric Rays are known from isolated teeth only, due to a cartilagenous skeleton with limited preservational potential, and a habit of shedding teeth throughout their lives. However, one species is known from several full body specimens, Titanonarke molini, from the Early Eocene Bolca Lagerstätte of Verona Province in northeast Italy.

In a paper published in the Journal of Systematic Palaeontology on 22 September 2017, Giuseppe Marramà of the Department of Palaeontology at the University of Vienna, Kerin Claeson of the Philadelphia College of Osteopathic Medicine, Giorgio Carnevale of the Dipartimento di Scienze della Terra at the Universit a degli Studi di Torino, and Jürgen Kriwet, also of the Department of Palaeontology at the University of Vienna, describe a second species of Titanonarke, also from the Bolca Lagerstätte.

The new species is named Titanonarke megapterygia, meaning 'large-fins'. The species is described from a specimen (MCSNV IG.135576) previously assigned to Titanonarke molini, but adjudged to be a separate species following a review of all the material assigned to the genus. The species is described from an almost complete, articulated, specimen 626.2 mm in length. It differs considerably from the original species, due to a much lower number of pre-caudal (non-tail) vertebrae - 74 compared to over 100 in Titanonarke molini - which greatly alters the body proportions of Titanonarke megapterygia.

Titanonarke megapterygia from the Eocene Monte Postale site. (A) MCSNV IG.135576; (B) detail of the head and hyoid apparatus. Abbreviations: ao, antorbital cartilage; cb, ceratobranchials; hym, hyomandibula; me, Meckel’s cartilage; nc, nasal capsule; pq, palatoquadrate; sca, scapulocoracoid; syn, synarcual; rf, rostral fontanelle; ro, rostral cartilage. Scale bars are 50 mm. Marramà (2017).

See also...


http://sciencythoughts.blogspot.co.uk/2017/10/rhinebothrium-reydai-new-species-of.htmlhttp://sciencythoughts.blogspot.co.uk/2016/09/potamotrygon-albimaculata-potamotrygon.html
http://sciencythoughts.blogspot.co.uk/2014/01/deepwater-sharks-from-early-miocene-of.htmlhttp://sciencythoughts.blogspot.co.uk/2014/01/a-new-species-of-eagle-ray-from.html
http://sciencythoughts.blogspot.co.uk/2012/05/satellite-tracking-manta-rays-off-coast.html
Follow Sciency Thoughts on Facebook.

4 comments:

  1. Alhamdulillah kami sekeluarga ucapkan banyak terima kasih kepada KI RONGGO LAWE atas bantuan KI RONGGO LAWE kami sudah bisa membayar semua hutang hutang kami yang menumpuk setinggi gunung kami juga sudah bisah buka usaha KI RONGGO LAWE, dulunya si saya ragu ragu dan kurang percaya yang namanya pesugihan uang gaib tapi mencoba dan alhamdulillah ternyata KI RONGGO LAWE benar - benar bisa menbantu saya dengan pesugihan uang gaib sekali lagi terima kasih KI RONGGO LAWE salam sukkses selalu.
    kalau mau seperti saya hubungi KI RONGGO LAWE Tlp/WhatsApp : 0853-1403-1099, atau KLIK DISINI

    INILAH JENIS MACAM PESUGIHAN DAN BOCORAN TOGEL 2D 3D 4D 5D 6D.....
    KI RONGGO LAWE Tlp/WhatsApp : 0853-1403-1099, atau KLIK DISINI

    >PESUGIHAN TUYUL| PELARIS USAHA
    >PESUGIHAN UANG GAIB
    >PESUGIHAN JIN KHODAM
    >PESUGIHAN UANG ASMA
    >PESUGIHAN UANG SEPASANG
    >PESUGIHAN UANG BALIK
    >TRANSFER JANIN
    >PESUGIHAN PUTIH TAMPA TUMBAL
    >PESUGIHAN NIKAH JIN
    >PELARISAN DAGANG

    ReplyDelete

  2. You are an entrepreneur, a private investor, or better a fast person having financing need taking into account a situation. You who are in search of loan of money. Here an opportunity online of borrowing money in 48 hour I offer to you loan of 10.000€ with 500.000€ up to 220.000.000,00€ with a rate of 3%. Here my e-mail: maurocallipo94@gmail.com





    You are an entrepreneur, a private investor, or better a fast person having financing need taking into account a situation. You who are in search of loan of money. Here an opportunity online of borrowing money in 48 hour I offer to you loan of 10.000€ with 500.000€ up to 220.000.000,00€ with a rate of 3%. Here my e-mail: maurocallipo94@gmail.com






    You are an entrepreneur, a private investor, or better a fast person having financing need taking into account a situation. You who are in search of loan of money. Here an opportunity online of borrowing money in 48 hour I offer to you loan of 10.000€ with 500.000€ up to 220.000.000,00€ with a rate of 3%. Here my e-mail: maurocallipo94@gmail.com

    ReplyDelete
  3. I am genuinely thankful to the owner of this website who has shared this fantastic piece of writing at this place.

    ReplyDelete
  4. My Brothers and Sister all over the world, I am Mrs Boo Wheat from Canada ; i was in need of loan some month ago. i needed a loan to open my restaurant and bar, when one of my long time business partner introduce me to this good and trustful loan lender DR PURVA PIUS that help me out with a loan, and is interest rate is very low , thank God today. I am now a successful business woman, and I became useful. In the life of others, I now hold a restaurant and bar. And about 30 workers, thank GOD for my life I am leaving well today a happy father with three kids, thanks to you DR PURVA PIUS Now I can take care of my lovely family, i can now pay my bill. I am now the bread winner of my family. If you are look for a trustful and reliable loan leader. You can Email him via,mail (urgentloan22@gmail.com) Please tell him Mrs Boo Wheat from Canada introduce you to him. THANKS

    ReplyDelete