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john
Guest
This is the same embryo again. Making an informed guess, I would say that this embryo will hatch within the next 48 hours.
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J
john
Guest
Note the increased number of pigment cells compared to yesterday's photos.
In salamanders, pigment cells first develop on the neural crest. The neural crest is the ridge along the top of the animal, which develops during neurulation (look back at the previous photos to see its initial development). The brain develops at one end of the neural crest and the spinal cord forms from/within the neural crest.
The animal's first pigment cells develop at the neural crest and migrate off of it during development, travelling down the flanks of the animal. You can see this effect if you compare this photo to yesterday's photos. Pigment cells multiply as the animal grows, the initial pigment cells forming patches that slowly "grow" towards and into each other, giving the animal its overall pigmentation.
Leucistic axolotls are an interesting genetic mutation to bring up here. They are white because the leucistic mutation causes pigment cells not to migrate from the neural crest. That's why you'll only ever find leucistic axolotls with a few black spots on the top of the head, and top parts of the flanks.
In salamanders, pigment cells first develop on the neural crest. The neural crest is the ridge along the top of the animal, which develops during neurulation (look back at the previous photos to see its initial development). The brain develops at one end of the neural crest and the spinal cord forms from/within the neural crest.
The animal's first pigment cells develop at the neural crest and migrate off of it during development, travelling down the flanks of the animal. You can see this effect if you compare this photo to yesterday's photos. Pigment cells multiply as the animal grows, the initial pigment cells forming patches that slowly "grow" towards and into each other, giving the animal its overall pigmentation.
Leucistic axolotls are an interesting genetic mutation to bring up here. They are white because the leucistic mutation causes pigment cells not to migrate from the neural crest. That's why you'll only ever find leucistic axolotls with a few black spots on the top of the head, and top parts of the flanks.
J
joeri
Guest
I like how you combine the pictures with information
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jesper
Guest
Hehe, gotta love your new avatar John.
Yeah the info is very nice, I've learned a lot from the development series you've posted.
Yeah the info is very nice, I've learned a lot from the development series you've posted.
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john
Guest
Thanks!
The remaining photos will be posted in one thread tomorrow. I have photos from yesterday and today.
The remaining photos will be posted in one thread tomorrow. I have photos from yesterday and today.
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triton
Guest
Thanks for all those pictures John!
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pamela
Guest
Great info and pic John! I enjoyed spying on my newt embryos - so interesting to see these little guys develop (and live!).
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john
Guest
The remaining photos from the last few days will come tonight. At this point nearly all of the larvae have hatched and many are already feeding. I've been taking a Caudata.org break for the last few days (I need to do that occasionally, no offence to anyone!).
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mark
Guest
Nice!
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rubén
Guest
Great photographs and nice explications : The didactic way