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Latest Chondrichthyes Stories

Elephant Shark DNA Decoded
2014-01-08 15:35:28

Ranjini Raghunath for redOrbit.com - Your Universe Online An international team of scientists has deciphered the genetic blueprint of the elephant shark - the oldest living animal in the cartilaginous fish family and the first to have its DNA decoded. Among fish, cartilaginous fish such as sharks and rays stand out because their skeleton is not made of bones. Their body is supported instead by cartilage, a flexible tissue that resembles muscle. Analysis of the elephant shark’s DNA...

Shark Brains Are Similar To Our Own
2012-10-31 12:58:10

Lee Rannals for redOrbit.com - Your Universe Online New research published in the journal Brain, Behavior and Evolution indicates that the infamous shark from the movie Jaws may have more in common with police chief Martin Brody than previously thought. The Australian government announced a new catch-and-kill policy for sharks last month after great white sharks killed five surfers and swimmers this past year. The government also said it would be funding research into other measures to...

2011-12-15 17:05:11

Biologists have long assumed that all jawed vertebrates possess a full complement of nearly identical genes for critical aspects of their development. But a paper in the December 16 issue of Science with Benjamin King of the Mount Desert Island Biological Laboratory (MDIBL) as lead author shows that elasmobranchs, a subclass of cartilaginous fishes, lack a cluster of genes, HoxC, formerly thought to be essential for proper development. Hox genes dictate the proper patterning of tissues...

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2009-09-22 09:15:00

Ancient and bizarre fish named by California Academy of Sciences researchers New species are not just discovered in exotic locales"”even places as urban as California still yield discoveries of new plants and animals. Academy scientists recently named a new species of chimaera, an ancient and bizarre group of fishes distantly related to sharks, from the coast of Southern California and Baja California, Mexico. The new species, the Eastern Pacific black ghostshark (Hydrolagus...

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2009-03-24 07:45:00

The genetic toolkit that animals use to build fins and limbs is the same genetic toolkit that controls the development of part of the gill skeleton in sharks, according to research to be published in Proceedings of the National Academy of Sciences on March 23, 2009, by Andrew Gillis and Neil Shubin of the University of Chicago, and Randall Dahn of Mount Desert Island Biological Laboratory. "In fact, the skeleton of any appendage off the body of an animal is probably patterned by the...


Latest Chondrichthyes Reference Libraries

Cownose Ray, Rhinoptera Bonasus
2012-12-29 10:52:00

The cownose ray is found in the western Atlantic from the coast of Maine to southern Brazil. In the fall schools of 10,000 or more will migrate south to the warmer water of Yucatan, Mexico. The cownose ray is a bottom dweller at depths of up to 70 feet, in brackish (salty) water. As a territorial act the cownose will leap out of the water and land with a loud smack. An adult cownose has a brown body with a yellowish white belly, has an average wingspan of 45 inches and can weigh 50 lbs,...

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2007-04-19 10:29:30

The Bramble shark, Echinorhinus brucus, is covered with large, thorn-like denticles, and hence the name "bramble" shark. Physical characteristics Bramble sharks have a long cylindrical body covered with large protruding denticles, no anal fin, two small dorsal fins placed far on the back just before the tail, and five pairs of gill slits. They can reach a maximum length of 10 ft (3.1 m). Distribution The bramble shark is found in the Western Atlantic from Georgia to Maine,...

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2007-04-13 19:56:36

The Kitefin shark, Seal shark, or Black shark, Dalatias licha, is a dogfish, the only species in the genus Dalatias, found in the Atlantic, western Mediterranean, western Indian Ocean, and western Pacific including Japan, Australia, Hawaii, and New Zealand, at depths of 164.04 to 5905.51 ft (50 to 1,800 meters). Its length is from 3.28 to 5.91 ft (1 to 1.8 meters). The Kitefin shark has a blunt snout and both dorsal fins are approximately equal in size. The trailing edges of all fins are...

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2007-03-26 14:08:56

The Frilled shark, Chlamydoselachus anguineus, is a primitive shark species, of the family Chlamydoselachidae in the order Hexanchiformes. The Southern African frilled shark is a proposed new species from the Southern African range. These two species are very different from the other hexanchiform sharks, and it has recently been proposed that the two frilled sharks should be given their own order: Chlamydoselachiformes. Additional extinct types are known from fossil teeth; thought to be...

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Word of the Day
penuche
  • A fudgelike confection of brown sugar, cream or milk, and chopped nuts.
'Penuche' is a variant of 'panocha,' a coarse grade of sugar made in Mexico. 'Panocha' probably comes from the Spanish 'panoja, panocha,' ear of grain.
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