| 单词 | ostracod |
| 例句 | The meal, she discovered, consisted of ostracods, tiny crustaceans with vaulting shells. Scientists reveal half-billion-year-old ‘last supper’ 2023-09-27T04:00:00Z On moonless nights in the Caribbean, the sea erupts in spectacular displays put on by tiny crustaceans called ostracods. Light shows by these tiny crustaceans reveal rich biodiversity on Caribbean reefs 2022-12-08T05:00:00Z When de Riville examined the sparkling water with his microscope, he discovered that the “small stars” were tiny crustaceans now known as ostracods. How the sea fireflies of the Caribbean are shining new light on evolution 2022-08-24T04:00:00Z Working in the northern Pacific Ocean, a team used sonar-like acoustic sampling to detect the daily movement of critters including copepods, ostracods, salps and krill. The Ups and Downs of a Great Vertical Migration 2021-12-06T05:00:00Z Around him swam hundreds of other ostracods, just like him, though the females were slightly fatter. When evolution’s path leads to a dead end 2018-06-08T04:00:00Z Prof Horne studies the fossil remains of ostracods to better understand winter and summer temperatures experienced by early humans in the British Isles. Rare tiny creatures found in loch near Kinross - BBC News 2016-12-09T05:00:00Z In other parts of the world these creatures only produce light to scare off predators, but in these waters, male ostracods spew glowing mucus to attract females. Light shows by these tiny crustaceans reveal rich biodiversity on Caribbean reefs 2022-12-08T05:00:00Z When he shone his flashlight through the water, he saw scores of ostracods flitting across its beam. How the sea fireflies of the Caribbean are shining new light on evolution 2022-08-24T04:00:00Z Modern ostracods today are similarly well-endowed and some produce absolutely humongous sperm, ten times the size of the male himself. Hot Water: The Bizarre Sex Lives of Ocean Creatures 2016-02-14T05:00:00Z Hunt had been focusing on fossil ostracods – one of the few taxa where sexual dimorphism can be readily identified in the fossil record. When evolution’s path leads to a dead end 2018-06-08T04:00:00Z Finding locations of living ostracods is key to this work. Rare tiny creatures found in loch near Kinross - BBC News 2016-12-09T05:00:00Z The ostracod is using its limbs to swim forward. Ancient Marine Parasites Make Their 21st Century Debut 2015-05-21T04:00:00Z The ostracods lit up in specific patterns in space and time, much like the courtship flashes of fireflies that light up summertime meadows. How the sea fireflies of the Caribbean are shining new light on evolution 2022-08-24T04:00:00Z Biologists hope to boost reproduction by adding microscopic creatures known as rotifers and ostracods to their menus. A man-made attempt to save the rarest fish on Earth 2014-10-04T04:00:00Z And in some cases, like ostracods, it’s quite handy. When evolution’s path leads to a dead end 2018-06-08T04:00:00Z The ostracods were actively reproducing just before they died, Dr. Matzke-Karasz found; male and female specimens were filled with sperm. An Ancient Shrimp’s Big Sperm, Preserved 2014-05-19T04:00:00Z These well-preserved fossil specimens are attached to the outside of the ostracod, potentially indicating an origin as an invertebrate external parasite for this group. Ancient Marine Parasites Make Their 21st Century Debut 2015-05-21T04:00:00Z Male ostracods only display for about an hour, shortly after sunset on moonless nights in warm Caribbean seas. How the sea fireflies of the Caribbean are shining new light on evolution 2022-08-24T04:00:00Z Yesterday, it was announced that the world’s oldest known sperm was found in the fossilized remains of a freshwater crustacean called an ostracod. The 6 most bizarre types of sperm found in nature 2014-05-16T04:00:00Z The team of researchers set about studying 93 species of extinct ostracod, featured in a recent study published in Nature. When evolution’s path leads to a dead end 2018-06-08T04:00:00Z Seventeen million years later, the fossilized tissue contains the preserved internal organs, including the sexual organs — and almost entirely preserved sperm cells, which would have contained the ostracod’s DNA. 17-million-year-old giant sperm discovered — and it was preserved in a very strange way 2014-05-14T04:00:00Z It wasn’t a very happy ending for our heroine, an ostracod crustacean. Fool's Gold Preserves Tiny, Ancient Crustacean 2014-03-27T19:34:28Z No bigger than a grain of sand, ostracods abound in fresh and saltwater. How the sea fireflies of the Caribbean are shining new light on evolution 2022-08-24T04:00:00Z Paleontologists say it represents a new genus and species, belonging to a class of shrimplike marine creatures called ostracods. Observatory: Fossils of New Species Discovered in England 2012-12-17T21:42:40Z Because many species of ostracods are still alive today. When evolution’s path leads to a dead end 2018-06-08T04:00:00Z The male sex cell was found in the fossilized remains of freshwater crustaceans, known as ostracods. 17-million-year-old giant sperm discovered — and it was preserved in a very strange way 2014-05-14T04:00:00Z It also preserved the beautiful details of our little ostracod and her family, frozen in time together till the end of the Earth. Fool's Gold Preserves Tiny, Ancient Crustacean 2014-03-27T19:34:28Z Only seagoing ostracods are bioluminescent, and it’s not their bodies that glow. How the sea fireflies of the Caribbean are shining new light on evolution 2022-08-24T04:00:00Z "It might look strange but you've got relatives of these ostracods in your ponds, in lakes, rivers and the oceans." Shrimp fossil-find 'new species' 2012-12-12T13:55:12Z So they were able to compare characteristics of extinct ostracod species with the abundant living species. When evolution’s path leads to a dead end 2018-06-08T04:00:00Z At one moment he has to deal with the bones of some large mammal scattered through a deposit of superficial gravel, at another time with the minute foraminifers and ostracods of an upraised sea-bottom. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" 2011-09-19T02:00:10.473Z But the squishy bits inside those countless ostracod shells rarely survived the fossilization process. Fool's Gold Preserves Tiny, Ancient Crustacean 2014-03-27T19:34:28Z In most of the world’s oceans, ostracods do this for defense—to startle and distract would-be predators. How the sea fireflies of the Caribbean are shining new light on evolution 2022-08-24T04:00:00Z The group also began to tease apart relationships among ostracod species. How the sea fireflies of the Caribbean are shining new light on evolution 2022-08-24T04:00:00Z Seventy million years ago, in a warm shallow sea, swam an ostracod — a tiny bean-shaped creature, no bigger than a grain of sand. When evolution’s path leads to a dead end 2018-06-08T04:00:00Z It’s not clear why glowing courtship displays didn’t spread to the Pacific before the barrier formed, but one possibility is that ostracods simply don’t disperse widely. How the sea fireflies of the Caribbean are shining new light on evolution 2022-08-24T04:00:00Z The consortium is now using ostracods as a new lens on one of the biggest questions in evolutionary biology: What drives the formation of new species? How the sea fireflies of the Caribbean are shining new light on evolution 2022-08-24T04:00:00Z Today, thousands of dives later, they believe those signals have driven Caribbean ostracods to diversify into more than 100 species. How the sea fireflies of the Caribbean are shining new light on evolution 2022-08-24T04:00:00Z Increasingly, ostracod researchers are delving into how evolution shaped the animals’ most distinctive feature—their flashes. How the sea fireflies of the Caribbean are shining new light on evolution 2022-08-24T04:00:00Z For over 6,000 individual ostracods, the team recorded the size, shape, and species of each fossil, and when they lived – by looking at where they occurred in the rocks. When evolution’s path leads to a dead end 2018-06-08T04:00:00Z Moreover, those tiny differences in the ostracod luciferase “correlate with different types of signals,” as this enzyme’s activity can dictate the brightness, duration, and other features of each flash. How the sea fireflies of the Caribbean are shining new light on evolution 2022-08-24T04:00:00Z Such studies would be easier in the lab, but ostracods “are notoriously difficult to culture,” says Trevor Rivers, a behavioral ecologist at the University of Kansas, Lawrence, who was an early student of Morin’s. How the sea fireflies of the Caribbean are shining new light on evolution 2022-08-24T04:00:00Z When male ostracods sense the water is dark enough, they take off from the reef or seagrass bed where they spend most of their time and begin their display. How the sea fireflies of the Caribbean are shining new light on evolution 2022-08-24T04:00:00Z They and others hope to eventually do the same with Caribbean ostracods. How the sea fireflies of the Caribbean are shining new light on evolution 2022-08-24T04:00:00Z The study showed that extinction rates in ostracods with the most pronounced sexual dimorphism of this type were 10 times higher than those with the least pronounced dimorphism. When evolution’s path leads to a dead end 2018-06-08T04:00:00Z Using lab-grown ostracods, Oakley’s team has now uncovered evidence for a key idea about the evolution of novelty: that new traits often spring from modifications of existing ones. How the sea fireflies of the Caribbean are shining new light on evolution 2022-08-24T04:00:00Z Thus, when ostracod bioluminescence arose 197 million years ago, it wasn’t newly invented, but rather a novel application for an existing gene network. How the sea fireflies of the Caribbean are shining new light on evolution 2022-08-24T04:00:00Z Back in the lab—often a makeshift setup in a hotel room—they sort through their catch and examine their collected ostracods under a microscope to identify the species. How the sea fireflies of the Caribbean are shining new light on evolution 2022-08-24T04:00:00Z With ostracods now reproducing in the lab, researchers hope to finally sequence the entire genome. How the sea fireflies of the Caribbean are shining new light on evolution 2022-08-24T04:00:00Z So those ostracod species where males invested heavily in sexual selection chose poorly, it seems. When evolution’s path leads to a dead end 2018-06-08T04:00:00Z The ostracod genome is longer than our own and has repetitive regions and other complexities that make it challenging to sequence from single specimens snared at sea. How the sea fireflies of the Caribbean are shining new light on evolution 2022-08-24T04:00:00Z The mechanics and biochemistry of their light flashes are relatively simple, and many species of ostracods overlap in small areas. How the sea fireflies of the Caribbean are shining new light on evolution 2022-08-24T04:00:00Z By the early 2000s the work had revealed that the behavior of courting ostracods is surprisingly complex: Flashes can be dim, bright, or even different tints. How the sea fireflies of the Caribbean are shining new light on evolution 2022-08-24T04:00:00Z In Japan, dried ostracods are popular as curiosities because they glow when rehydrated. How the sea fireflies of the Caribbean are shining new light on evolution 2022-08-24T04:00:00Z Evolutionary stresses impacted them more than ostracods with more similar genders, sending them quickly into the evolutionary history books. When evolution’s path leads to a dead end 2018-06-08T04:00:00Z He used dried ostracods to work out the basic biochemistry of bioluminescence, which has evolved independently about 100 times. How the sea fireflies of the Caribbean are shining new light on evolution 2022-08-24T04:00:00Z And while generating them the ostracods move in species-specific ways—up, down, or on a slant—creating strings of flashes that range in length from less than 1 meter up to 30 meters. How the sea fireflies of the Caribbean are shining new light on evolution 2022-08-24T04:00:00Z The flashes show up as visible light, but the only way to see the ostracods without drowning out the flashes is to use infrared. How the sea fireflies of the Caribbean are shining new light on evolution 2022-08-24T04:00:00Z He and his student Emily Ellis compared the rates at which new species form in ostracods that use their flashes as courtship displays with the rate in those that don’t. How the sea fireflies of the Caribbean are shining new light on evolution 2022-08-24T04:00:00Z And they do, Oakley’s team reported in 2016—not only in Caribbean ostracods, but also in insects, fish, and octopuses with bioluminescent courtship displays. How the sea fireflies of the Caribbean are shining new light on evolution 2022-08-24T04:00:00Z Gerrish, too, has found evidence in ostracods that sexual selection can drive diversity. How the sea fireflies of the Caribbean are shining new light on evolution 2022-08-24T04:00:00Z |
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