head shield
head shield
1. The term sometimes applied to the cephalon in trilobites (Trilobita).
2. The dorsal head covering of solid bone which occurs in many ostracoderms (Ostracodermi) (agnathan fish, see AGNATHA).
1. The term sometimes applied to the cephalon in trilobites (Trilobita).
2. The dorsal head covering of solid bone which occurs in many ostracoderms (Ostracodermi) (agnathan fish, see AGNATHA).
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head shield