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Lopha.sp / Alectryonia.sp
"Lopha species have a thick, strongly ribbed shell with unequal valves. The margins of the valves have a characteristic zig-zag pattern. The lower valve shows finger-like outgrowths, by which the molluscs adhere to the substrate. These molluscs are stationary epifaunal suspension feeders, as they feed filtering sea water to extract the nutrients."
"Lopha is a genus of marine bivalve molluscs in the family Ostreidae. The genus Lopha is present from the Triassic period in the LowerNorian age (216.5 ± 2.0 – 203.6 ± 1.5 Mya) to the recent age." Reference-http://en.wikipedia.org/wiki/Alectryonia
This amazing Alectryonia spotting is from Tiruchirapalli,Tamil Nadu, India.