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Of the Silurian and Devonian
Answer for the clue "Of the Silurian and Devonian ", 13 letters:
heterostracan
Alternative clues for the word heterostracan
Word definitions for heterostracan in dictionaries
Wiktionary
Word definitions in Wiktionary
n. Any of the Heterostraci, an extinct class of jawless vertebrates that lived primarily in marine and estuary environments.
WordNet
Word definitions in WordNet
n. extinct jawless fish with the anterior part of the body covered with bony plates; of the Silurian and Devonian