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Reblogged from theladyfish
HAMMERHEAD SHARK, BONNETHEAD SHARK and Asexual Reproduction The family of hammerhead sharks exhibit a viviparous mode of reproduction with females giving birth to live young. Like other sharks, fertilization is internal with the male transferring sperm to the female through one of two intromittent organs called “claspers.” The developing embryos are at first sustained by a yolk sac. When the supply of yolk is exhausted, the depleted yolk sac transforms into a structure analogous to a mammalian placenta (called a “yolk sac placenta” or “pseudoplacenta”), through which the mother delivers sustenance until birth. In 2007, the bonnethead shark (Sphyrna tiburo) was found to be capable of asexual reproduction via automictic parthenogenesis, in which a female’s ovum fuses with a polar body to form a zygote without the need for a male. This was the first shark known to do this. Photo of Bonnethead or Shovelnose Shark, which is a variety of Hammerhead Shark Fact Source: http://en.wikipedia.org/wiki/Hammerhead_shark Photo Source: http://marinebio.org/search/50.asp?formaction=search&class=elasmobranchii —- In May 2007 scientists discovered that Hammerhead sharks can reproduce asexually through a rare method known as parthenogenesis, as they have the ability to fertilize their own eggs. At first the announcement was considered skeptically, due to the fact that a female shark can store sBonnethead SharkSphyrna tiburoperm inside her for months, even years, but it was confirmed through DNA testing that the pup lacked any paternal DNA. This is the first documented case of any shark doing this. —Animal Web Guide

HAMMERHEAD SHARK, BONNETHEAD SHARK and Asexual Reproduction

The family of hammerhead sharks exhibit a viviparous mode of reproduction with females giving birth to live young. Like other sharks, fertilization is internal with the male transferring sperm to the female through one of two intromittent organs called “claspers.” The developing embryos are at first sustained by a yolk sac. When the supply of yolk is exhausted, the depleted yolk sac transforms into a structure analogous to a mammalian placenta (called a “yolk sac placenta” or “pseudoplacenta”), through which the mother delivers sustenance until birth.

In 2007, the bonnethead shark (Sphyrna tiburo) was found to be capable of asexual reproduction via automictic parthenogenesis, in which a female’s ovum fuses with a polar body to form a zygote without the need for a male. This was the first shark known to do this.

Photo of Bonnethead or Shovelnose Shark, which is a variety of Hammerhead Shark

Bonnethead Shark - Sphyrna tiburo

Fact Source: http://en.wikipedia.org/wiki/Hammerhead_shark

Photo Source: http://marinebio.org/search/50.asp?formaction=search&class=elasmobranchii

—-

In May 2007 scientists discovered that Hammerhead sharks can reproduce asexually through a rare method known as parthenogenesis, as they have the ability to fertilize their own eggs. At first the announcement was considered skeptically, due to the fact that a female shark can store s
Bonnethead Shark
Sphyrna tiburoperm inside her for months, even years, but it was confirmed through DNA testing that the pup lacked any paternal DNA. This is the first documented case of any shark doing this.

—Animal Web Guide

(Source: theladyfish, via 123zero)

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