Episode 117 - Crabs and Carcinization

The Common Descent Podcast

Common Descent

Science, Education, Earth Sciences, Natural Sciences, Science:natural Sciences

4.8 • 764 Ratings

🗓️ 11 July 2021

⏱️ 116 minutes

🔗️ Recording | iTunes | RSS

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Summary

What exactly is a “crab” anyway? One answer is that they are among the most diverse and successful living arthropods. Another answer: they are many different groups of crustaceans that have converged on a crabby body plan. In this episode, we discuss the diversity and evolution of “true crabs,” the incredible phenomenon of carcinization that keeps creating crabs, and what it really means to be a “crab.” In the news: poop beetles, Arctic dinosaurs, Dragon Man, and an ancient shark attack. Time markers:Intro & Announcements: 00:00:00News: 00:04:30Main discussion, Part 1: 00:38:00Main discussion, Part 2: 01:06:00Patron question: 01:46:00 Check out our blog for bonus info and pictures:http://commondescentpodcast.wordpress.com/ Find merch at the Common Descent Store! http://zazzle.com/common_descent Follow and Support us on: Patreon: https://www.patreon.com/commondescentpodcast Twitter: https://twitter.com/CommonDescentPCFacebook: https://www.facebook.com/commondescentpodcastInstagram: @commondescentpodcast YouTube: https://www.youtube.com/channel/UCePRXHEnZmTGum2r1l2mduwPodBean: https://commondescentpodcast.podbean.com/ iTunes: https://itunes.apple.com/us/podcast/the-common-descent-podcast/id1207586509?mt=2 The Intro and Outro music is “On the Origin of Species” by Protodome. More music like this at http://ocremix.org. Musical Interludes are "Professor Umlaut" by Kevin MacLeod (incompetech.com). Licensed under Creative Commons: By Attribution 3.0http://creativecommons.org/licenses/by/3.0/

Transcript

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0:00.0	You're listening to the Common Descent podcast.
0:18.4	Hello, David. Hello, Will. And hello, listeners.
0:22.2	And welcome to episode 117 of the Common Descent podcast.
0:28.1	Today we are discussing crabs.
0:30.8	Crabbs and also maybe some things that are kind of crabs?
0:34.2	Yeah, we're going to talk about crabs and carcinization.
0:40.3	How do you get things that look like crabs? Ooh, with special guest Clancy Brown.
0:42.3	No, that would have been cool though.
0:44.3	Oh, man.
0:45.3	I was hoping that he would manifest next to us.
0:47.3	Yes, yes, if we believed, if we truly believed.
0:50.3	Well, darn.
0:51.3	Well, this episode, without any special guests, we will be discussing crabs, the group known as true crabs, but also the concept of how do we get crab-shaped things, because that's happened more than once.
1:10.0	Right.
1:10.2	When you think of crabs, you're thinking
1:12.3	of probably a much vaster group than are actually technically crabs. Which is also a very vast
1:19.0	group. Yeah. So we will discuss what are crabs, where do they fall in the groups of animals,
1:27.0	how did they come to be?
1:28.6	What's their diversity?
1:29.7	But we'll also discuss how do a lot of these things that we call crabs?
1:34.2	Why are they also looking very crabby when they're not in that group?
1:38.5	And what are some of the details of this concept?
	...

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