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Glite Dictionary
heterostracan

heterostracan

9.9
An extinct jawless fish with bony plates on its head and front body that lived in the sea
  • noun
  • /ˌhɛtəroʊˈstrækən/
  • Specialized
translation icon : heterostracano
  • Fossils of the heterostracan reveal a heavily armored head and a tail adapted for swimming.

Examples

  • Many heterostracans had bony armor that protected them from predators.

  • Many museum collections feature specimens of heterostracan fishes from the Devonian period.

  • The heterostracan lineage offers insight into the early evolution of vertebrate skeletons.

  • The heterostracan fossils were discovered in a Silurian rock layer.

  • Fossils of the heterostracan reveal a heavily armored head and a tail adapted for swimming.

  • Many museum collections feature specimens of heterostracan fishes from the Devonian period.

  • The heterostracan lineage offers insight into the early evolution of vertebrate skeletons.

Synonyms

Heterostraci
vsheterostracan
  • Specialized
9.9

A group of armored jawless fish that lived in ancient seas and are now extinct

is a single member of that group found in Silurian and Devonian times
suborder Heterostraci
vsheterostracan
  • Specialized
9.9

Fish with hard plates and no jaws known from fossils that lived a very long time ago

is a single member of this taxonomic unit specific to Silurian and Devonian
Ostracodermi
vsheterostracan
  • Specialized
9.9

An extinct group of jawless animals with heavy bony shields from long ago

is a narrower term for one fish lineage with anterior bony plates

Surface Forms

heterostracan singular
heterostracans plural

Morphology

heterostracan = ostracan (semi-transparent) = hetero + ostracan

Formed from Greek combining elements 'hetero-' (different) + 'ostracan' (shell/armored fish); the parts are classical and technical, so a general learner may only partially recognize 'hetero' but not 'ostracan'.

Etymology

Heterostracan comes from the Greek parts hetero- 'different' and ostracon 'shell'. So the name paints a simple picture of a fish covered with different bony 'shells' or plates, which is why it is used for these extinct, jawless fishes.