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The first known filter feeder is a large shrimp-like creature called Tamisiocaris borealis. The feather-like structures on its head were used to rake plankton from the sea.
Photo

The First Filter Feeder

Today, filter feeders like clams, sponges, krill, baleen whales, fishes, and many...
A shell placed in seawater with increased acidity slowly dissolves over 45 days.
Photo

Shell Dissolves in Seawater

Over a 10-year period, NOAA scientists have collected 72,000 seawater samples, and...
X-ray Image of a Monterey Skate
Photo

X-Ray Image of a Monterey Skate

An X-ray image of a Monterey skate (Raja montereyensis) reveals a spine that...
X-ray image of a winghead shark
Photo

X-Ray Image of a Winghead Shark

The distinctive form of a winghead shark (Eusphyra blochii) is revealed by an X-ray...
Researchers use underwater equipment to measure a skate (Bathyraja richardsoni) on the Mid-Atlantic Ridge.
Photo

Measuring a Skate on the Mid-Atlantic Ridge

How does this skate (Bathyraja richardsoni) measure up? Researchers use underwater...
The robotic arm of the ROV Quest finds life at an undersea vent.
Photo

Studying Hydrothermal Vent Life

Census researchers manipulate the robotic arm of the remotely operated vehicle...
Color illustration of an ancient bivalve.
Photo

Elevator Rudists

These "elevator" rudists, an ancient bivalve, used one long heavy valve to anchor...
Notice the pink tentacles, which “recliners” used to filter feed.
Photo

Recliner Rudists

Where ocean currents were strong, ancient rudist “recliners” lay unattached on...
Rudist clams are mollusks that went extinct about 65 million years ago.
Photo

Rudist Clams

Rudist clams are mollusks that went extinct about 65 million years ago. They were...
A thresher shark was killed after becoming stuck in a gillnet.
Photo

Thresher Shark Killed by a Gillnet

"Tens of millions of sharks are killed each year, often only for their fins. I have...
A rendering of an underwater marine scene depicting life ~145-65 million years ago, when rudist clams were the major reef builders.
Photo

Carbonate Reef (Cretaceous Period: 145 - 65 Million Years Ago)

This illustration shows the edge of a warm inland sea during the Cretaceous Period,...
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