heterostracan

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Definitions from WordNet

Noun heterostracan has 1 sense

heterostracan - extinct jawless fish with the anterior part of the body covered with bony plates; of the Silurian and Devonian
--₁ is a kind of jawless vertebrate, jawless fish, agnathan
--₁ is a member of Heterostraci, suborder Heterostraci

Definitions from the Web

Heterostracan

Definition: Heterostracan refers to a group of extinct, jawless fish belonging to the class Heterostraci, which lived during the Silurian and Devonian periods. These ancient fishes possessed a bony armor covering their bodies and are considered significant in the evolution of vertebrates.

Sample Sentences:

The fossil of a Heterostracan was discovered in the sedimentary rock layer.
Scientists study Heterostracans to understand the early development of vertebrates.
The Heterostracan's bony armor provided protection from predators.

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