单词 | Ptyctodontida |
释义 | Ptyctodontida [´tik·tǝ`dänt·ǝd·ǝ] PALEONTOLOGY An order of Middle and Upper Devonian fishes of the class Placodermi in which both the head and trunk shields are present, and the joint between them is a well-differentiated and variable structure. |
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