Welcome to FIS   Sponsored By
Subscribe to FIS | Register with FIS | Advertise with FIS | Newsletter | About FIS | Contact us
   


A 166-million-year-old fossil of an extinct relative of the squid. (Photo: NYT JONATHAN JACKSON & ZOE HUGHES/National History Museum London)

Why did squids lose their shells?

Click on the flag for more information about United Kingdom UNITED KINGDOM
Monday, March 20, 2017, 21:10 (GMT + 9)

Did you know hundreds of millions of years ago, the ancestors of squids, octopus, and cuttlefish, were slow and heavily armoured creatures?

Shaped like a torpedo and about as swift, squids are jet-propelled underwater predators. Together with their nimble brethren, the octopus and cuttlefish, they make for an agile invertebrate armada.

But that was not always the case. Hundreds of millions of years ago, the ancestors of the tentacled trio were slow, heavily armoured creatures.

Alastair Tanner, a doctoral student at University of Bristol in England, wanted to better understand why those cephalopods lost their shells.

So Mr. Tanner conducted a genetic analysis of 26 present day cephalopods, including the vampire squid, the golden cuttlefish and the southern blue-ringed octopus.

With the molecular clock technique, which allowed him to use DNA to map out the evolutionary history of the cephalopods, he found that today’s cuttlefish, squids and octopuses began to appear 160 to 100 million years ago, during the so-called Mesozoic Marine Revolution.

During the revolution, underwater life underwent a rapid change, including a burst in fish diversity. Some predators became better suited for crushing shellfish, while some smaller fish became faster and more agile.

“There’s a continual arms race between the prey and the predators,” said Mr. Tanner. “The shells are getting smaller, and the squids are getting faster.”

The evolutionary pressures favoured being nimble over being armoured, and cephalopods started to lose their shells, according to Mr. Tanner. The adaptation allowed them to out-compete their shelled relatives for fast food, and they were able to better evade predators. They were also able to keep up with competitors seeking the same prey.

Today most cephalopods are squishy and shell-less. The biggest exception is the nautilus. But though there are more than 2,500 fossilized species of nautilus, today only a handful of species exist.

Squid and octopus species number around 300 each, and there are around 120 species of cuttlefish. The differences in number, compared with the nautilus, indicates the advantages that these cephalopods may have gained over their shelled relatives, according to Mr. Tanner.

Author: Nicholas St. Fleur, The New York Times


[email protected]
www.fis.com


 Print


Click to know how to advertise in FIS
MORE NEWS
Russian Federation
Apr 21, 02:50 (GMT + 9):
Russian Fishery to set up pollock processing plant in the Russian Far East
Australia
Apr 21, 02:30 (GMT + 9):
South Australian sardine fishery to enter MSC assessment process
Worldwide
Apr 21, 02:00 (GMT + 9):
IN BRIEF - Small changes in rainforests cause big damage to fish ecosystems
Australia
Apr 21, 02:00 (GMT + 9):
Salmon cannery hopes to attract Australian consumers’ interest
Portugal
Apr 21, 01:50 (GMT + 9):
New tuna factory to start operations in Vila Nova de Cerveira
United Kingdom
Apr 21, 01:30 (GMT + 9):
The British encouraged to consume jellyfish
Canada
Apr 21, 01:00 (GMT + 9):
IN BRIEF - BC oyster farmers taking big hit as three farms still closed due to contamination
United Kingdom
Apr 21, 01:00 (GMT + 9):
IN BRIEF - Salmon packs recalled over health concern
Senegal
Apr 21, 01:00 (GMT + 9):
IN BRIEF - A rise in foreign industrial trawlers off the coast of Senegal is causing local fishermen to lose their livelihoods
United States
Apr 21, 01:00 (GMT + 9):
IN BRIEF - Local Shellfish Beds Restricted Due To Pollution
Worldwide
Apr 21, 01:00 (GMT + 9):
IN BRIEF - Annual 5.0% Growth expected for Global Aquaculture Market by 2021
Peru
Apr 21, 00:00 (GMT + 9):
Virtual platform to favour data sharing on fight against IUU fishing
United States
Apr 20, 23:20 (GMT + 9):
Five Alaska seafood businesses to participate in trade mission to China
European Union
Apr 20, 22:50 (GMT + 9):
International high-tech system project could revolutionise fishing industry
Spain
Apr 20, 22:30 (GMT + 9):
Alantra fund acquires Canarian fish producer and distributor



Lenguaje
FEATURED EVENTS
  
TOP STORIES
Russian Fishery to set up pollock processing plant in the Russian Far East
Russia Fed. The Russian Fishery Company has announced plans to start setting up a fish processing factory at Nadezhdinskaya Priority Development Territory, close to Vladivostok, in the Russian Far East.
Foundation to award USD 950,000 for fisheries innovation projects
United States The National Fish and Wildlife Foundation has made a request for proposals focusing on innovation and supporting effective participation of fishermen and fishing communities in the implementation of sustainable fisheries in the United States.
European Parliament approves EU-Mauritius fisheries agreement
European Union The plenary session of the European Parliament approved the fisheries agreement between the European Union and Mauritius, which will be valid for four years and benefits 85 EU vessels.
EC intends to speed trade deal settlements with with Japan and Singapore
European Union The EC proposes to speed the settlement of the Economic Partnership Agreement with Japan and the trade and investment agreements with Singapore.
 
Maruha Nichiro Corporation
Nichirei Corporation -Headquarter-
Pesquera El Golfo S.A.
Ventisqueros - Productos del Mar Ventisqueros S.A
Wärtsilä Corporation -Wartsila Group Headquarter-
ITOCHU Corporation -Headquarter-
BAADER - Nordischer Maschinenbau Rud. Baader GmbH+Co.KG (Head Office)
Inmarsat plc - Global Headquarters
Marks & Spencer
Tesco PLC (Supermarket) - Headquarters
Sea Harvest Corporation (PTY) Ltd.
I&J - Irvin & Johnson Holding Company (Pty) Ltd.
Blue Continent Products (Pty) Ltd - (Oceana Group Limited)
Pesquera San Jose S.A.
Nutreco N.V. - Head Office
CNFC China National Fisheries Corporation - Group Headquarters
W. van der Zwan & Zn. B.V.
SMMI - Sunderland Marine Mutual Insurance Co., Ltd. - Headquarters
Icicle Seafoods Inc. -Headquarter-
Starkist Seafood Co. - Headquearters
Trident Seafoods Corp.
American Seafoods Group LLC - Head Office
Marel - Group Headquarters
SalMar ASA - Group Headquarters
Sajo Industries Co., Ltd
Hansung Enterprise Co.,Ltd.
BIM - Irish Sea Fisheries Board (An Bord Iascaigh Mhara)
CEFAS - Centre for Environment, Fisheries & Aquaculture Science
COPEINCA ASA - Corporacion Pesquera Inca S.A.C.
Chun Cheng Fishery Enterprise Pte Ltd.
VASEP - Vietnam Association of Seafood Exporters & Producers
Gomes da Costa
Furuno Electric Co., Ltd. (Headquarters)
NISSUI - Nippon Suisan Kaisha, Ltd. - Group Headquarters
FAO -Food and Agriculture Organization- Fisheries and Aquaculture Department (Headquarter)
Hagoromo Foods Co., Ltd.
Koden Electronics Co., Ltd. (Headquarters)
A.P. Møller - Maersk A/S - Headquarters
BVQI - Bureau Veritas Quality International (Head Office)
UPS - United Parcel Service, Inc. - Headquarters
Hamburg Süd Group - (Headquearters)
Armadora Pereira S.A. - Group Headquarters
NOAA - National Oceanic and Atmospheric Administration (Headquarters)
Omega Protein Corporation -Headquarter-
Marona S.A.
Marine Harvest ASA - Headquarters
Marubeni Europe Plc -UK-
Findus Ltd
Icom Inc. (Headquarter)
WWF Centroamerica
Oceana Group Limited
The David and Lucile Packard Foundation
Ajinomoto Co., Inc. - Headquarters
Friosur S.A. - Headquarters
Cargill, Incorporated - Global Headquarters
Benihana Inc.
Leardini Pescados Ltda
Mitsubishi Corporation Marine Products Depts. D.Team
CJ Corporation  - Group Headquarters
Greenpeace International - The Netherlands | Headquarters
David Suzuki Foundation
Fisheries and Oceans Canada -Communications Branch-
Mitsui & Co.,Ltd - Headquarters
NOREBO Group (former Ocean Trawlers Group)
Natori Co., Ltd.
Carrefour Supermarket - Headquarters
FedEx Corporation -Headquarter-
AKBM - Aker BioMarine ASA
Seafood Choices Alliance -Headquarter-
Austevoll Seafood ASA
Walmart / Wal-Mart Stores, Inc. (Supermarket) -Headquarter-
New Japan Radio Co.Ltd (JRC) -Head Office-
Gulfstream JSC
INVE Group - Head Office
Marine Stewardship Council - MSC Worldwide Headquarters
Royal Dutch Shell plc (Headquarter)
Genki Sushi Co.,Ltd -Headquarter-
Iceland Pelagic ehf
AXA Assistance Argentina S.A.
Caterpillar Inc. - Headquarters
Tiger Brands Limited
Morpol ASA - Group Headquarters
SeaChoice
National Geographic Society
AmazonFresh, LLC - AmazonFresh

Copyright 1995 - 2018 Fish Info & Services Co.Ltd| All Rights Reserved.   DISCLAIMER