Subscribe: RSS Podcast iTunes
Episode 856             Episode 858
Episode 857

Ambondro mahabo
Mon, 2019-Sep-09 01:52 UTC
Length - 3:14

Direct Link

Welcome to featured Wiki of the Day where we read the summary of the featured Wikipedia article every day.

The featured article for Monday, 9 September 2019 is Ambondro mahabo.

Ambondro mahabo is a mammal from the middle Jurassic (about 167 million years ago) of Madagascar. The only species of the genus Ambondro, it is known from a fragmentary lower jaw with three teeth, interpreted as the last premolar and the first two molars. The premolar consists of a central cusp with one or two smaller cusps and a cingulum (shelf) on the inner, or lingual, side of the tooth. The molars also have such a lingual cingulum. They consist of two groups of cusps: a trigonid of three cusps at the front and a talonid with a main cusp, a smaller cusp, and a crest at the back. Features of the talonid suggest that Ambondro had tribosphenic molars, the basic arrangement of molar features also present in marsupial and placental mammals. It is the oldest known mammal with putatively tribosphenic teeth; at the time of its discovery it antedated the second oldest example by about 25 million years.

Upon its description in 1999, Ambondro was interpreted as a primitive relative of Tribosphenida (marsupials, placentals, and their extinct tribosphenic-toothed relatives). In 2001, however, an alternative suggestion was published that united it with the Cretaceous Australian Ausktribosphenos and the monotremes (the echidnas, the platypus, and their extinct relatives) into the clade Australosphenida, which would have acquired tribosphenic molars independently from marsupials and placentals. The Jurassic Argentinean Asfaltomylos and Henosferus and the Cretaceous Australian Bishops were later added to Australosphenida, and new work on wear in australosphenidan teeth has called into question whether these animals, including Ambondro, did have tribosphenic teeth. Other paleontologists have challenged this concept of Australosphenida, and instead proposed that Ambondro is not closely related to Ausktribosphenos plus monotremes, or that monotremes are not australosphenidans and that the remaining australosphenidans are related to placentals.

This recording reflects the Wikipedia text as of 01:52 UTC on Monday, 9 September 2019.

For the full current version of the article, see Ambondro mahabo on Wikipedia.

This podcast is produced by Abulsme Productions based on Wikipedia content and is released under a Creative Commons Attribution-ShareAlike License.

Visit wikioftheday.com for our archives, sister podcasts, and swag. Please subscribe to never miss an episode. You can also follow @WotDpod on Twitter.

Abulsme Productions produces the current events podcast Curmudgeon's Corner as well. Check it out in your podcast player of choice.

This has been Kimberly. Thank you for listening to featured Wiki of the Day.

For current episodes, or for the rest of the Wiki of the Day family of podcasts go here.


Archive Episodes:
1-100  101-200  201-300  301-400  401-500
501-600  601-700  701-800  801-867  

  Buy WotD Stuff!!

Feedback welcome at feedback@wikioftheday.com.

These podcasts are produced by Abulsme Productions based on Wikipedia content.

They are released under a Creative Commons Attribution-ShareAlike 3.0 Unported License.

Creative Commons License

Abulsme Productions also produces Curmudgeon's Corner, a current events podcast.

If you like that sort of thing, check it out too!


Page cached at 2019-09-19 02:57:53 UTC
Original calculation time was 1.3084 seconds

Page displayed at 2019-09-20 00:20:19 UTC
Page generated in 0.0002 seconds