Begin typing your search above and press return to search.
proflie-avatar
Login
exit_to_app
Peoples priority is livelihood issues
access_time 12 April 2024 4:30 AM GMT
The survival challenge before the CPM
access_time 10 April 2024 5:05 AM GMT
NATO
access_time 9 April 2024 4:00 AM GMT
Genocide failing in its goal
access_time 8 April 2024 4:13 AM GMT
DEEP READ
Schools breeding hatred
access_time 14 Sep 2023 10:37 AM GMT
Ukraine
access_time 16 Aug 2023 5:46 AM GMT
Ramadan: Its essence and lessons
access_time 13 March 2024 9:24 AM GMT
exit_to_app
Homechevron_rightSciencechevron_rightHalf-billion-year-old...

Half-billion-year-old sea fossil hints at new ideas on brain evolution

text_fields
bookmark_border
Half-billion-year-old sea fossil hints at new ideas on brain evolution
cancel
camera_alt

Pic: Velvet worms

Scientists are questioning what they know about brain evolution after finding the fossils of a small sea creature that died over half a billion years ago. The worm-like animal has the oldest fossilised brain ever discovered.

The study on the 1.5 cm long fossil belongs to a creature called Cardiodictyon catenulum. It has a delicately preserved nervous system which includes a brain. The sea animal belongs to an extinct group of animals known as armoured lobopodians. They were common in the Cambrian period which is when all major animal lineages appeared. The closest living relatives of lobopodians are velvet worms found in Australia, New Zealand, and South America.

According to experts, the fossil shows an unexpected anatomy. It has a segmented trunk and repeating arrangements of neural structures known as ganglia. But its head and brain have no signs of segmentation, which is a structure found in modern arthropods and some of their fossilised ancestors.

This discovery contributes greatly to the debate about the origin and composition of the head in arthropods which include insects, crustaceans, spiders, millipedes, and centipedes.

"From the 1880s, biologists noted the clearly segmented appearance of the trunk typical for arthropods, and basically extrapolated that to the head. But Cardiodictyon shows that the early head wasn't segmented, nor was its brain, which suggests the brain and the trunk nervous system likely evolved separately," said the study published in the journal Science.

Show Full Article
TAGS:evolutionbrainfossilbrain evolutionvelvet worms
Next Story