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Heterostraci

   Also found in: Encyclopedia, Wikipedia 0.04 sec.
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.Heterostraci - extinct group of armored jawless fishes or fish-like vertebrate; taxonomy is not clear
suborder Heterostraci
animal order - the order of animals
order Ostracodermi, Ostracodermi - extinct group of armored jawless vertebrates; taxonomy is not clear
heterostracan - extinct jawless fish with the anterior part of the body covered with bony plates; of the Silurian and Devonian


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Because of new information discovered by the fossil turnaround,Elliott believes that this fossil and several similar ones had been inappropriately assigned to an order of fish, Heterostraci, whose members have only a single set of tube-like openings that run to the gills.
Facing up to a backwards fossil by Science News
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