Cosmic Calendar: The first vertebrates and fish!

December 19th on the Cosmic Calendar:  The first vertebrates and actual fish appear!

Myllokunmingia is currently the oldest known vertebrate — a 28 x 6mm chordate.  It had a distinct head and body, dorsal and ventral fins.

Haikouichthys is considered the first actual fish.  Haikouichthys was a craniate, meaning it had an actual skull and backbone (myllokunmingia’s were probably made of cartilage).  Haikouichthys was about the same size at 25mm.  Fossils show it had between 6 and 9 gills.

Myllokunmingia

Haikouichthys

Haikouicthys

This is still the Cambrian explosion!

You may remember Cosmos, the 1980 PBS series by Carl Sagan. Maybe you also recall Sagan’s “Cosmic Calendar” from the series, where in order to put the immensely vast history of the universe into a comprehensible scale, he mapped it onto a calendar year. In other words, if the entire history of the universe were one year, with the big bang in the first second of midnight on January first, and the present day on the last second of December 31st, New Year’s Eve. A project of mine this year has been to note the major events in the Cosmic Calendar, on the real calendar, on this blog!

Advertisements

Leave a comment

Filed under Cosmic Calendar

I'd love to hear your thoughts and interpretations! Your comments and likes are what keep the paintings and posts coming. :)

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s