Revealed: 'Spider' ancestors had two sets of eyes!
Ancestors of modern-day arachnids had two sets of eyes rather than one, scientists have now discovered from the images of a 305-million-year-old harvestman fossil.
The primitive fossilised harvestman, named Hastocularis argus, was found in eastern France and had not only median eyes -- those found near the centre of the body -- but lateral eyes on the side of the body as well, said the scientists.
"Arachnids can have both median and lateral eyes, but modern harvestmen only possess a single set of median eyes -- and no lateral ones," said Russell Garwood, a palaeontologist at the University of Manchester in Britain.
"These findings represent a significant leap in our understanding of the evolution of this group," Garwood said.
The scientists used the X-ray imaging techniques to reveal features of the unusually well-preserved fossil like never before.
The team supported their results by examining the expression of an "eye stalk" gene in living harvestmen and found that in a modern harvestman embryo this gene shows hints of a now-lost lateral eye.
The findings of the study appeared in the journal Current Biology
(Posted on 12-04-2014)
Information on States of India:
Andaman Nicobar | Andhra Pradesh | Assam | Bihar | Chandigarh | Chhattisgarh | Dadar Nagar Haveli | Daman Diu | Delhi | Goa | Gujarat | Haryana | Himachal Pradesh | Jammu Kashmir | Jharkhand | Karnataka | Kerala | Lakshadweep | Madhya Pradesh | Maharashtra | Manipur | Meghalaya | Mizoram | Nagaland | Orissa | Pondicherry | Punjab | Rajasthan | Sikkim | Tamil Nadu | Tripura | Uttar Pradesh | Uttaranchal | West Bengal
INDIA REGIONAL MAPS:
Andhra Pradesh Travel Map | Bihar Travel Map | Goa Travel Map | Gujarat Travel Map | Haryana Travel Map | Himachal Pradesh Map | Karnataka Travel Map | Kerala Travel Map | Maharashtra Travel Map | Punjab Travel Map | Rajasthan Travel Map | Sikkim Travel Map | Tamil Nadu Travel Map | Uttar Pradesh Travel Map | West Bengal Travel Map |
MORE MAPS OF INDIA:
INDIA CITY MAPS:
KERALA TRAVEL MAPS: