| 单词 | ostracoderm |
| 释义 | ostracoderm (once / 1477414 pages) n WORD FAMILY ostracoderm: ostracoderms USAGE EXAMPLESOther authors have associated the Ostracoderms, the oldest known vertebrates, with this group. Various, Encyclopaedia Britannica, 11th Edit...(2012) The first generation was a group of strange creatures, half fish and half Crustacean, which are known as the Ostracoderms. McCabe, Joseph, The Story of Evolution(2010) Some experts think, however, that the fish developed directly from a Crustacean, and hold that the Ostracoderms are the connecting link. McCabe, Joseph, The Story of Evolution(2010) n extinct fish-like jawless vertebrate having a heavily armored body; of the Paleozoic Hyper agnathan, jawless fish, jawless vertebrate eel-shaped vertebrate without jaws or paired appendages including the cyclostomes and some extinct forms |
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