Navigation Links
Untangling spider's webs
Date:7/17/2014

For decades, the story of spider evolution went like this: As insects became more and more diverse, with some species taking to the skies, spiders evolved new hunting strategies, including the ability to weave orb-shaped webs to trap their prey.

From that single origin, the story goes, orb-weaver spiders diverged along different evolutionary paths, leading to today, where several species weave similar though not identical webs.

It's a good story, but there's just one problem Harvard scientists now know it's not true.

The largest-ever phylogenetic study of spiders, conducted by postdoctoral student Rosa Fernndez, Gonzalo Giribet, Alexander Agassiz Professor of Zoology, and Gustavo Hormiga, a professor at George Washington University, shows that, contrary to long-held popular opinion, the two groups of spiders that weave orb-shaped webs do not share a single origin. The study is described in a July 17 paper published in Current Biology.

"This study examines two different groups of orb-weaver spiders, as well as several other species," Giribet said. "Using thousands of genes, we did a comparative phylogenetic analysis, and what we now know is there is not a single origin for the orb-weaver spiders.

"There are two possible explanations for this," he continued. "One is that the orb web evolved far back in the lineage of the two groups, but has been lost in some groups. The other option is that the orb web evolved independently in these two groups. We still haven't resolved that question yet we need to sample many more of these intermediate groups before we can say which option is correct."

The belief that orb-weaver spiders shared a common origin, Giribet said, came largely from earlier morphological studies.

Even as new genetic tools became more commonplace in the last two decades, the single origin theory held sway, in part, because early phylogenetic studies relied on just a handfu
'/>"/>

Contact: Peter Reuell
preuell@fas.harvard.edu
617-496-8070
Harvard University
Source:Eurekalert

Page: 1 2 3

Related biology news :

1. Untangling lifes origins
2. Untangling Alzheimers disease
3. Untangling whole genomes of individual species from a microbial mix
4. Flying jewels spell death for baby spiders
5. Crabs, insects and spiders vulnerable to oil spill, but also resilient
6. Velvet spiders emerge from underground in new cybertaxonomic monograph
7. Vampire jumping spiders identify victims by their antennae
8. Are brown widows displacing black widow spiders around southern California homes?
9. Aussie wasp on the hunt for redback spiders
10. Snakes minus birds equals more spiders for Guam
11. UF study shows spiders, not birds, may drive evolution of some butterflies
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/6/2015)... 2015 NXT-ID, Inc. (NASDAQ: NXTD ) ... focused on the growing mobile commerce market, announced ... for MINIATURE, MULTI-PURPOSE ANTENNA METHOD AND SYSTEM ... NXT-ID introduces a new revolutionary method and system ... use of miniature antenna modules for multiple purposes ...
(Date:4/1/2015)...  NXT-ID, Inc. (NASDAQ: NXTD ) ("NXT-ID" or ... growing mobile commerce market, announces the second shipment of ... to early access pre-order customers. Feedback ... outlets including Walmart, Target, AT&T, Dunkin, Donuts, Stop & ... at all outlets and very easy to use. Several ...
(Date:3/26/2015)... 2015 The Granite Club, ... athletic club, today announced it has implemented a state-of-the-art ... movement for members and staff, while restricting access to ... we selected FST,s IMID Access system because it has ... members and staff, in addition to unparalleled security," said ...
Breaking Biology News(10 mins):NXT-ID Patents Miniature, Low Power Wireless Magnetic Stripe 2NXT-ID Patents Miniature, Low Power Wireless Magnetic Stripe 3NXT-ID Patents Miniature, Low Power Wireless Magnetic Stripe 4NXT-ID Reports Second Shipment of Wocket Smart Wallets Underway to Early Access Pre-order Customers and Provides User Feedback 2NXT-ID Reports Second Shipment of Wocket Smart Wallets Underway to Early Access Pre-order Customers and Provides User Feedback 3NXT-ID Reports Second Shipment of Wocket Smart Wallets Underway to Early Access Pre-order Customers and Provides User Feedback 4Granite Club First Private Club in North America to Implement FST Biometrics Secure Access Solution, as Part of Multi-million Dollar Expansion 2
... notorious for their thick skin and well-armored bodies. So it comes ... touch is one of the most acute in the animal kingdom. ... of small, pigmented domes that dot their skin all over their ... jaws. A new study, published in the Nov. 8 issue ...
... 7, 2012 Listed below are the selected highlights for ... journal, GENETICS . The November issue is available ... , Vol. 192, November 2012, Copyright 2012. Please ... in these articles. ISSUE HIGHLIGHTS , An ...
... Every week in his clinic at the University of Michigan, ... dying or shrinking due to disease or injury. ... other effects that nerve-destroying conditions cause and wishes he ... regenerate their nerves. Then he heads to his research lab ...
Cached Biology News:Despite their thick skins, alligators and crocodiles are surprisingly touchy 2Despite their thick skins, alligators and crocodiles are surprisingly touchy 3Genetics Society of America's GENETICS journal highlights for November 2012 2Genetics Society of America's GENETICS journal highlights for November 2012 3Genetics Society of America's GENETICS journal highlights for November 2012 4Stem cells + nanofibers = Promising nerve research 2Stem cells + nanofibers = Promising nerve research 3
(Date:4/21/2015)... Immune Pharmaceuticals Inc., or "Immune" (NASDAQ: ... elected Rene-Pierre Azria as a Director and ... oversight on strategic and financial transactions. Mr. Azria will ... Compensation Committee and the Corporate Governance and Nomination Committee. ... have a long-time interest in Life Sciences and in ...
(Date:4/21/2015)... Genomics, a leading provider of cloud-based genomic medicine technology, today ... of Marketing. Mr. Forsythe is the latest to join the ... operations over the last two quarters. ... a tremendous addition to the Tute Genomics team," stated ... vast experience commercializing software technology in a highly complex and ...
(Date:4/21/2015)... -- Novogen Limited (ASX:NRT; NASDAQ: NVGN ) ("Company" or ... has entered into definitive agreements today to issue ... attaching 6-month option and half of one attaching ... institutional investors in the United States ... gross proceeds of approximately AU$15,500,000 ("Placement"). The closing ...
(Date:4/21/2015)... and RESEARCH TRIANGLE PARK, N.C. ... (NASDAQ: UTHR ) announced today that it will ... open on Tuesday, April 28, 2015. United ... 28, 2015, at 9:00 a.m. Eastern Time.  The teleconference ... 1-970-315-0533.  A rebroadcast of the teleconference will be available ...
Breaking Biology Technology:Immune Board Elects Rene-Pierre Azria A Director And Chair Of The Transaction Committee 2Immune Board Elects Rene-Pierre Azria A Director And Chair Of The Transaction Committee 3Immune Board Elects Rene-Pierre Azria A Director And Chair Of The Transaction Committee 4Tute Genomics Continues Expansion of Genomic Medicine Commercial Operations; Appoints Josh Forsythe as New VP of Marketing 2Tute Genomics Continues Expansion of Genomic Medicine Commercial Operations; Appoints Josh Forsythe as New VP of Marketing 3Tute Genomics Continues Expansion of Genomic Medicine Commercial Operations; Appoints Josh Forsythe as New VP of Marketing 4Novogen Conducts Private Placement and Announces Rights Offering to Shareholders 2Novogen Conducts Private Placement and Announces Rights Offering to Shareholders 3Novogen Conducts Private Placement and Announces Rights Offering to Shareholders 4Novogen Conducts Private Placement and Announces Rights Offering to Shareholders 5Novogen Conducts Private Placement and Announces Rights Offering to Shareholders 6
... JERSEY CITY, New Jersey, August 12, Rosetta Genomics ... first quarter financial results on August 19, 2008, ... a conference call with a,simultaneous webcast to discuss ... 19., To access the live conference call, ...
... Calif., Aug. 12 ChromaDex,Corporation, (OTC Bulletin Board: ... research, today announced financial results for the,second quarter ... accordance with,U.S. Generally Accepted Accounting Principles (GAAP), ChromaDex ... $0.03 per share for the,three months ended June ...
... -- 3SBio Inc.,(Nasdaq: SSRX ), a leading ... marketing biopharmaceutical,products, today announced its unaudited financial results ... Second Quarter 2008 Financial Highlights: -- ... quarter 2007 to RMB59.6 ...
Cached Biology Technology:Rosetta Genomics Announces Conference Call and Webcast of Second Quarter Financial Results 2ChromaDex Announces Second Quarter 2008 Financial Results 2ChromaDex Announces Second Quarter 2008 Financial Results 33SBio Inc. Announces Second Quarter 2008 Results 23SBio Inc. Announces Second Quarter 2008 Results 33SBio Inc. Announces Second Quarter 2008 Results 43SBio Inc. Announces Second Quarter 2008 Results 53SBio Inc. Announces Second Quarter 2008 Results 63SBio Inc. Announces Second Quarter 2008 Results 73SBio Inc. Announces Second Quarter 2008 Results 83SBio Inc. Announces Second Quarter 2008 Results 93SBio Inc. Announces Second Quarter 2008 Results 103SBio Inc. Announces Second Quarter 2008 Results 113SBio Inc. Announces Second Quarter 2008 Results 123SBio Inc. Announces Second Quarter 2008 Results 133SBio Inc. Announces Second Quarter 2008 Results 143SBio Inc. Announces Second Quarter 2008 Results 15
Reacts with methylated DNA from plants and vertebrates...
Rabbit polyclonal to VEZT ( Abpromise for all tested applications). Antigen: Full length human VEZT conjugated to GST Entrez Gene ID: 55591 Swiss Protein ID: Q9HBM0...
WTAP Antibody...
Mouse monoclonal to Factor V Heavy Chain Immunogen: Purified human Factor V. Specificity: This antibody reacts with the activation C peptide (mw ~150,000) in the heavy chain of thrombin-cleave...
Biology Products: