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Thursday, December 08, 2022

Clam thought extinct 1.8 million years ago resurfaces in California

A group of marine scientists has found alive a species of clam that was thought to have gone extinct a million years ago and was known only from fossils.

it’s about species simatio cookie, belonging to the Pleistocene epoch, occurred 1.8 million years ago and was located at Naples Point, off the coast of UC Santa Barbara, during an afternoon of low tide in November 2018, when Jeff Goddard, a research associate at the Institute of Marine Science, was removing rocks in search of nudibranch marine Slug.

“Their shells were only 10 millimeters long,” Goddard added that “When they spread out and waved a bright white striped leg longer than their carapace, I realized I had never seen this species before.”

Is live clams It has an oval shell; outer surface thinly stippled; sculpture of radial ribs few, broad, low; ventral margin undulating; right valve with anterior cardinal tooth; The study, published in Zoo Keys, reports that the left valve with two anterior cardinal teeth.

The discovery is significant because the invertebrates that live in the rocky intertidal zone of southern and central California are among the most studied and documented in the world. So it came as a surprise that the first known bivalve from the Pleistocene was recently discovered at the bottom of intertidal rocks at Naples Point in California’s Santa Barbara County, experts said.

Now experts believe the discovery of this millions-year-old clam could lead to more discoveries in southern California and the possibility of further south to Mexico.

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