DISCOVER Magazine. Science, Technology and The Future
Current Issue
Subscribe Today »
  • Renew
  • Give a Gift
  • Archives
  • Customer Service
  • Facebook
  • Twitter
  • Newsletter
  • Health & Medicine
  • Mind & Brain
  • Technology
  • Space
  • Human Origins
  • Living World
  • Environment
  • Physics & Math
  • Video
  • Photos
  • Podcast
  • RSS
Discoblog
« The Strange German Disease Called “Kevinism”: Can a Lame Name Mess Up Your Life?
NCBI ROFL: Who needs a doctor when you have Facebook? »

The World’s Heaviest Insect Is 3,500 Times More Massive Than the Smallest Vertebrate

Record-breaking critters are always crawling, hopping, swimming or otherwise locomoting across our radar. To indulge our curiosity about two creatures who showed up recently in the news, we did a little quick and dirty Photoshopping. If you put the world’s heaviest insect—the giant weta, one of which was recently observed enjoying a carrot on a researcher’s palm—next to the world’s smallest vertebrate—a newly discovered frog so tiny it’s dwarfed by a dime—it might look something like this:

spacing is important

That’s the frog, off to the right. It weighs just 0.02 grams. This weta tipped the scales at 71 grams, according to Mark Moffett, the scientist who snapped her picture. So the cricket-like weta is about 3,500 times the weight of the frog, which Christopher Austin and colleagues found by scooping up leaf litter that was making a funny chirping noise and painstakingly removing the leaf fragments until they found a scrap that hopped.

Wetas can reach 10 centimeters in body length, 20 with their legs extended. The frog is about 7 millimeters long, so it would take around 30 of the frogs lined up head to tail to extend the length of the weta. For your viewing pleasure, here’s the frog on a dime, magnified:

frog

Images (c) Mark Moffett / Minden and courtesy of PLoS One

Share

February 1st, 2012 9:36 AM Tags: Christopher Austin, giant weta, Mark Moffett, PLoS ONE, world's smallest frog
by Veronique Greenwood in The Wide (& Strange) World of Animals, Top Posts | 23 comments | RSS feed | Trackback >

  • Precursor

    All the strange strange creatures … 

  • Mud

    Is that the bug that starred in the first MIB movie? 

  • Sapphyre

    Awww I love fwogs!

  • H Davis79

    How about prehistoric insects.  I’m sure some were much much bigger.

  • Tony Mach

    I doubt it. There is a size limit to insects AFAIK, they are limited by their tracheal system (“decentralized” breathing), their circulatory system (no heart) and their exoskeleton. I would imagine this beast is close to that limit.

  • Anonymous

    It may depend on the oxygen content and air density, but the research is still being conducted.  The prehistoric atmosphere may have allowed insects to surpass that limit. There are prehistoric dragonflies that had a wing span of 2.5 ft: http://en.wikipedia.org/wiki/Meganeura

  • Relicaxe

    Actually, 300 million years ago insects could grow quite large. Some up to 5 feet (millipedes for example) because the atmosphere contained a much higher percentage of oxygen. For modern day though I would agree that this insect is probably reaching the size cap.

  • Donna Hamilton

    Well it’s not the heaviest one found, but it’s still awesome!!
    Check out this video of hunting the tree/bush weta
    http://www.youtube.com/watch?v=tC3kRsYqDxY

  • Max Blake

    It’s not the World’s Largest Insect! The larvae of many species of beetle get much heavier than this, weighing over 100g. Dynastes hercules and D. neptunus get around 150g, four species of Goliath beetle larvae, Goliathus, get over 100g, and some of the largest elephant beetles, Megasoma, get over 200g. Some beetles like titan beetles, Titanus, probably get as heavy as this, possibly heavier. Because the larval biology of many beetles is so poorly known, there are probably even heavier species. I think the current record is for a Megasoma acteon which weighed 228g, over three times heavier than the weta. 

  • DylanTK

    I simply cannot determine which beastie is cuter.

  • Gee Aye

    Yes but what about insects?

  • Gee Aye

    This is a comparison of like with like so your larval example is not relevant. I mean how silly would it be to have then compared the vertebrate equivelant of larva?

  • Max Blake

    It never says it’s a comparison of like for like. It’s a very vertebrate-centric view of the world to promote an idea that a larvae as just some insignificant stage in the life cycle of an animal. Over 800,000 species of described animal, around 2/3rds of all described animals have this life cycle with a massive feeding larvae. I agree that it is stupid to compare it to a vertebrate larvae, but just concentrating on large adults is, as I say, a very vertebrate-centric view of animals.
    Just looking at the ‘maximum weight an animal reaches in its life cycle’ should be synonymous with the ‘heaviest animal’. 

  • Anonymous

    Hi Max, for more discussion on the “heaviest animal” moniker, check out the discussion in this piece, which is where we first learned about the weta: http://photoblog.msnbc.msn.com/_news/2011/12/01/9150501-worlds-biggest-bug-that-depends

  • Zooman

    The cricket is full of eggs.  I wonder if they are fertile.

  • Zooman

    Last I heard, millipedes are NOT insects.

  • Rolf Worth

    These insects are getting huge because of Global Warming. It is the end of the world.

  • Jonny

     …is what she said after stepping inside the computer lab.

  • Guest

    That is one big-a** grasshopper …..

  • mickey

    lmfao thanks – i needed that laugh this morning…

  • Art

    This giant cricket is what Weta Studios in New Zealand is named after: the people who design the fantastic creatures for films such as the ‘Lord of the Rings’ trilogy !

  • Ava

    How beautiful they both are!

  • Gordon Haas

    Now compare that with the colossal squid (Mesonychoteuthis hamiltoni, the largest known invertebrate, which weighs in at as much as 495 kg., which is more than 6,970 times the weight of the Giant Weta, and more than 24,750,000 times the weight of the frog.





    • About the Blog

      Discoblog is DISCOVER's compendium of quirky, funny, and surprising science news from the edge of the known universe. It's written by Veronique Greenwood and Valerie Ross. Email tips and suggestions to vgreenwood [at] discovermagazine [dot] com.

      Discoblog also includes the daily feature NCBI ROFL, in which two prone-to-distraction grad students post real scientific articles with funny subjects. Email your tips to ncbirofl [at] gmail.com. Follow the ROFL feed here.

    • Twitter

      Follow @discovermag
    • Facebook

    • Twidget

      Add Tweets
    • Archives

      Archives

      • May 2012
      • April 2012
      • March 2012
      • February 2012
      • January 2012
      • December 2011
      • November 2011
      • October 2011
      • September 2011
      • August 2011
      • July 2011
      • June 2011
      • May 2011
      • April 2011
      • March 2011
      • February 2011
      • January 2011
      • December 2010
      • November 2010
      • October 2010
      • September 2010
      • August 2010
      • July 2010
      • June 2010
      • May 2010
      • April 2010
      • March 2010
      • February 2010
      • January 2010
      • December 2009
      • November 2009
      • October 2009
      • September 2009
      • August 2009
      • July 2009
      • June 2009
      • May 2009
      • April 2009
      • March 2009
      • February 2009
      • January 2009
      • December 2008
      • November 2008
      • October 2008
      • September 2008
      • August 2008
      • July 2008
      • June 2008
      • May 2008
      • April 2008
      • March 2008
      • February 2008
      • January 2008
      • December 2007
      • November 2007
      • October 2007
      • September 2007
      • August 2007
      • July 2007
      • June 2007
      • May 2007
      • April 2007
      • February 2007
      • January 2007
      • December 2006
      • November 2006
      • October 2006
      • September 2006


  • Kalmbach Publishing Co.

    Copyright © 2012, Kalmbach Publishing Co.

    Privacy - Terms - Reader Services - Subscribe Today - Advertise - About Us