User talk:Elfgirl M-chan

Welcome!

Hello, Elfgirl M-chan, and welcome to Wikipedia! Thank you for your contributions. I hope you like the place and decide to stay. Here are some pages that you might find helpful:

I hope you enjoy editing here and being a Wikipedian! Please sign your messages on discussion pages using four tildes (~~~~); this will automatically insert your username and the date. If you need help, check out Wikipedia:Questions, ask me on my talk page, or ask your question on this page and then place {{helpme}} before the question. Again, welcome! Alientraveller (talk) 08:39, 22 September 2008 (UTC)[reply]

Hammerhead reproduction

Please stop editing the hammerhead shark articles. Hammerheads are not ovoviviparous, but viviparous, meaning that their embryos are sustained by a placenta. Thanks. -- Yzx (talk) 07:14, 27 March 2009 (UTC)[reply]

I am well aware as to what viviparous means and that research has helped show that hammerheads exhibit this trait. However, when the given descriptions in the articles listed them as being sustained by a yolk sac instead of a placenta, I meant to edit and clear up the potential contradictions based on other sources that list them as being ovoviviparous, as many other sharks are. In any case, since you got to them before I was able to, thank you for making the edits from yolk sac to placenta in those articles while I was working on verifying some facts from other resources. Elfgirl M-chan (talk) 08:56, 27 March 2009 (UTC)[reply]

Hammerheads are sustained by a yolk sac in the earliest stages of development; when this is exhausted the tissues of the yolk sac are converted into a placenta. Because of this it is referred to as a "yolk sac placenta" or a "pseudoplacenta", but functionally it is the same as a mammalian placenta, and thus they are regarded as viviparous. -- Yzx (talk) 15:52, 27 March 2009 (UTC)[reply]

Thank you for the clarification. Elfgirl M-chan (talk) 22:43, 27 March 2009 (UTC)[reply]