C. e. popei terrestrial egg deposition

TJ

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Tim Johnson
I hadn't figured they'd lay eggs on land when given the alternative of laying them on plants or plastic strips in the water. But in the last few days, my C.e.p have laid three eggs in terrestrial moss and one on a part of a piece of bogwood that juts out of the water.

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I heard from a herpetologist that they do this in the wild, and that eggs can be found in plants and moss on the edge of water bodies. He surmised they may do this especially when the density of newts in breeding ponds is high, to prevent the eggs being eaten. But as those who have kept them in captivity for any length of time know, they show no compunction about eating their own eggs when given half a chance!
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(Jennewt recently brought to my attention that Paris had posted before on thus same subject before)
 
I have around 250 strands of Egeria densa in this particular tank, and yet one female chose to deposit 15 eggs on one strand (on the right in this pic)
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Well, I'd seen the terrestrially laid eggs before, but never caught the newts in the act of laying them -- until now
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Seems by the way she's hunched that she's straining to push the egg out. Another egg can be seen under her arm.

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More like a "peeping Tim"
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These exhibitionists don't seem to mind though!
 
is it a coincidence that the newt which is seemingly the dullest coloured uses the land for egg deposition - being less visible with almost none of those golden spots???
chris
 
Hi Tim,
I have had C. cyanureus at work deposit terrestrial eggs.
Here is a pic I just got around to scanning into the computer.

Ed
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Fantastic, Ed! Is that common with this species? Please don't hesitate to post more of the development of the eggs
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The breeding season is over as far as my ensicauda are concerned. Yesterday, the temperature in Tokyo hit 39.5C, the hottest on record. I've managed to lower the room temp to 24C with the air-conditioner running at full blast, but not cool enough the inspire breeding.
 
Well for what it is worth I had common Japanese fire bellied newts depositing pretty much the same way some years ago. It were in fact sasayamé type animals. there are plenty of other salamanders that do so (like Tylototriton). maybe one of the reasons might be to avoid predation of the males (and other females ?), since they seem to have a nice nose to find and eat the eggs. most of this moss -when living- sucks up water anyway so that the eggs should be able to evolve , but what happens when they hatch is another story (I also collected the eggs of my firebelied ones).
 
Alas the eggs vanished in a couple of days. I have to look for them but I do have some pictures of larval cyanureus around here somewhere and the larva get very large and do not always go through a terrestrial stage.

Ed
 
Maybe you guys should try to protect the eggs and see if when they hatch, if the larval newt wriggles to the water or just dies. If the first was possible, then that would "justify" this behavior...LOL
 
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