Episode 83 - Coelacanths

The Common Descent Podcast

Common Descent

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

4.8 • 764 Ratings

🗓️ 22 March 2020

⏱️ 103 minutes

🔗️ Recording | iTunes | RSS

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Summary

In 1938, a fishing crew pulled up a fish that everyone thought had been extinct for 70 million years. Since then, coelacanths have become famous not just for their strangely incomplete fossil record, but also for their unique anatomy, their reclusive lifestyle, and their close relationship to land vertebrates. From fossils to genetics, this episode is all about what we know – and what we’re missing – of the story of coelacanths. In the news: an old weasel, fish through time, daily bivalve growth, and cave cockroaches. Time markers: Intro & Announcements: 00:00:00News: 00:06:00Main discussion, Part 1: 00:34:30Main discussion, Part 2: 01:03:00Patron question: 01:36:00 Check out our blog for bonus info and pictures:http://commondescentpodcast.wordpress.com/ The Common Descent Store is open! Get merch! 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 PodBean: https://commondescentpodcast.podbean.com/ iTunes: https://itunes.apple.com/us/podcast/the-common-descent-podcast/id1207586509?mt=2YouTube: https://www.youtube.com/channel/UCePRXHEnZmTGum2r1l2mduw 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.
0:19.0	Hello, David. Hello, Will.
0:21.2	And hello, listeners.
0:22.9	Welcome to episode 83 of the Commissent podcast where we are discussing sealicants.
0:29.3	Selecants.
0:30.0	Hey, we're back in the oceans.
0:31.4	Yeah.
0:31.9	More specifically, we're back with fish.
0:33.8	Yes.
0:34.4	This might be our third fish episode.
0:36.3	I do believe so.
0:38.0	Yeah, Placoderms 29, Sharks 48.
0:40.6	Yeah.
0:41.1	Now we're with celicants.
0:42.4	We're doing a weird one now.
0:44.8	Yes, it is.
0:45.5	This is a very small group of fish nowadays that is only found in a couple places around the world and is notable for having a very unusual fossil record.
0:58.9	We knew of celicants almost a hundred years before we discovered living celicants.
1:05.1	Yeah, we had fossils of them back to the Mesozoic.
1:08.9	Then much later learned that they are also still alive.
1:12.5	And so there's a gap in their record that precluded us to thinking they were extinct until
1:18.7	we found them. And it makes them the quintessential example of what I believe are called the
	...

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