| NOUN | animal | heterostracan | extinct jawless fish with the anterior part of the body covered with bony plates |
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| Meaning | Extinct jawless fish with the anterior part of the body covered with bony plates; of the Silurian and Devonian. | |
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| Member of | Heterostraci, suborder Heterostraci | Extinct group of armored jawless ... / jawless fishes or fish-like vertebrate |
| Broader | jawless vertebrate, jawless fish, agnathan | eel-shaped vertebrate without jaws / jaws or paired appendages including the cyclostomes and some extinct forms |
| Spanish | heterostracan | |
| Catalan | heterostracan | |
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