Image courtesy of April I. Neander,
Joel
Kontinen
“Wood,
plant fibres, hides, bone and other organic materials must have been central to
daily life, but they normally disappear,” says Mariana Nabais, also at the Catalan Institute. “So when a
site like Abric Romaní preserves wooden imprints and charred wooden objects, it
is almost like suddenly seeing the missing half of the toolkit.”
Naoki Morimoto at Kyoto University in Japan
describes the wooden objects as “remarkable”.
“The
mammalian ways of swallowing and suckling are unique,” says Zhe-Xi Luo at the University of Chicago. “It is one of
several biological adaptations of mammals that stand out from all other
vertebrates.”
Luo and his
colleagues have discovered a new genus of mammaliform, a creature that lived
before the last common ancestor of the living mammalian groups – monotremes,
marsupials and placentals – that would have been able to chew and suck.
It is also
the earliest known example of a mammal that evolved for a semi-aquatic
lifestyle. The animal has been dubbed Megacauda sungei, referencing its broad
tail and palaeontologist Sun Ge.
The fossil,
which evolutionist say is dated to between 163 million and 168 million years ago, was found by local farmers in the Daohugou area of Inner Mongolia, China.
“It is a
chimera,” says Luo. “The back half of Megacauda is more similar to the
platypus, of all mammals. But the skull and teeth are analogous to river
otters.”
With an
estimated weight of 1 kilogram, the creature is the largest known mammaliform
from the Middle-Late Jurassic, when the planet was dominated by dinosaurs.
Source:
James Woodford 2026 Stunning early mammal fossil sheds light on the evolution of suckling | New Scientist 7 October
