Ian Woods Profile picture
Sep 30, 2021 12 tweets 7 min read Read on X
Follow along live with sea urchin development!

Photos and videos by @IthacaCollege in #icdevbio

Here's the first cell division - showing beautiful cytokinesis at 10X speed (from yesterday afternoon)
Here's a photo from yesterday evening. This one is nearing morula stage. 'Morula' = Latin for 'mulberry' ... what do you think? #icdevbio
Here's early morning today: after/during primary mesenchyme ingression, before invagination. Cells that eventually become the 'skeleton' of the larvae have popped out of their outer layer and into the interior of the embryo. Hard to catch these guys - they move! #icdevbio
And here is one from late morning today: invagination has begun ... gastrulation is full steam ahead! #icdevbio
Thanks to all the @ithacacollege students in #icdevbio for the photos and videos! I'll post more as I receive them.
Backing up a bit in time, here’s a video of fertilization from yesterday. The fertilization envelope raises from the surface of the egg, preventing additional sperm from entering. Thanks to @paigeram06 for the video! #icdevbio
Here’s the live view from right now - gastrulation has progressed nicely and there’s a tube running all the way through the embryo.
And here’s the same embryo in darkfield illumination
Backing up in time while waiting for videos & photos from awesome @IthacaCollege #icdevbio students ....

Here's yesterday, collecting gametes. Foregound = female urchin shedding eggs into seawater. Background right, a purplish male urchin is shedding sperm (white stuff on top)
Wrong way!!

One of the students found this urchin embryo, in which gastrulation occurred in the wrong direction - this is an example of exogastrulation.

Never seen one of these before! Super exciting!
Here we are at two days postfertilization, early pluteus larva stage. The larva has a nifty skeleton, and a rudimentary digestive system. It’s getting ready to go find some food!
Sea urchin pluteus larva in action!! Born 48 hours ago @IthacaCollege #icdevbio

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More from @enwudz

Jul 11, 2018
I love my job. I teach and mentor students at a primarily undergraduate institution. Hundreds of people want my job, because my job is awesome. Why do 100’s of people want my job? Why is my job awesome? Here's why:
my job = evangelist for science. I especially love teaching non-science majors. My job = help them to rediscover their love of science that they all had as curious kids
my job = prepare students to think critically, to evaluate the data, and to be skeptical of the spin. My job is to help my students recognize truth in an increasingly post-truth climate
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