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conodont

   Also found in: Dictionary/thesaurus, Wikipedia, Hutchinson 0.03 sec.

conodont

Minute toothlike fossil composed of the mineral apatite (calcium phosphate); conodonts are among the most frequently encountered fossils in marine sedimentary rocks of Paleozoic age. They are the remains of animals that lived 543–248 million years ago that are believed to have been small marine invertebrates living in the open oceans and coastal waters throughout the tropical and temperate zones.
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Paleontologists debated whether this conodont animal was a true vertebrate or an invertebrate chordate similar to amphioxus.
Jump-start for the vertebrates; new clues to how our ancestors got a ... by Monastersky, Ronald / Science News
Extremely common in rocks from 520 to 205 million years old, the pointy, millimeter-sized conodont fossils have mystified paleontologists for 150 years.
Fossil enigma bares teeth, tells its tale by Monastersky, Richard / Science News
An important find is a 1-centimeter-long conodont animal, the oldest and fourth example ever found.
Traces of soft-bodied beasties by Science News
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