Fossil shows beginnings of flatfish eye weirdness

June 29, 2012 

The fossil skull of the primitive flatfish Heteronectes, with the left-side view showing the eye migrating toward the top of the head.


A fossil of a 50 million-year-old flatfish found in Italy shows an evolutionary intermediate stage between symmetrical-eyed fish and today's wacky-looking, asymmetrical-eyed halibut and other flatfish species. Scientists writing for the Journal of Vertebrate Paleontology say the fossil shows one eye beginning to move toward the top of the head.

The study provides the first detailed description of a primitive flatfish, revealing that the migrated eye had not yet crossed to the opposite side of the skull in early members of this group. Heteronectes, with its flattened form, shows the perfect intermediate stage between most fish with eyes on each side of the head and specialized flatfishes where both eyes are on the same side.

Read more at Fossil reveals secret of flatfishes

Note: Discover magazine points out this fossil discovery was originally reported on in more detail four years ago in the journal Nature.

Anchorage Daily News is pleased to provide this opportunity to share information, experiences and observations about what's in the news. Some of the comments may be reprinted elsewhere in the site or in the newspaper. We encourage lively, open debate on the issues of the day, and ask that you refrain from profanity, hate speech, personal comments and remarks that are off point. Thank you for taking the time to offer your thoughts.

Commenting FAQs | Terms of Service