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June 20, 2007

Discovery of New Species of Mammal Sparks Research into The Explosive Rise of Present–Day Placental Mammals
Study asserts that placental mammals originated on Earth 65 million years ago

EMBARGOED BY NATURE UNTIL
1800 London time / 1300 US Eastern Time on June 20, 2007

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On the left is Maelestes gobiensis; on the right is a living hairy-tailed mole Parascalops breweri from Allegheny County. Maelestes was comparable in size to the mole (40 to 80 grams), but had a more shrew-like life style . Note that the skull of Maelestes has more room for teeth that the mole does, and in fact, Maelestes had even more teeth as the bone holding the upper incisors is missing.
Photo: John Wible/CMNH


 

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The skull of Maelestes in comparison to two other eutherians from the same time period in Mongolia, Asioryctes and Zalambdalestes. Maelestes is more closely related to Asioryctes, and their skulls are more similar here.
Illustration: Paul Bowden/CMNH


 

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Family tree for Maelestes (indicated by the silhouetted mammal). The K/T boundary is in red. All placentals in the tree post date the K/T boundary and no Cretaceous taxa are included within Placentalia (the formal name for placental mammals).


 

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Maelestes teeth (last two premolars and molars):
(A) uppers in lateral view;
(B) uppers in occlusal view;
(C) lowers in occlusal view;
(D) lowers in lingual view;
(E) lowers in labial view
Illustration: Paul Bowden/CMNH


 

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Maelestes anterior skull and jaw in lateral view.
Illustration: Paul Bowden/CMNH


 

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Maelestes skull, ventral anterior view.
Illustration: Paul Bowden/CMNH


 

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Maelestes skull, ventral posterior view.
Illustration: Paul Bowden/CMNH


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