| 释义 |
placoderm
pla·co·derm P0343950 (plăk′ə-dûrm′)n. Any of various extinct jawed fishes of the group Placodermi of the Silurian and Devonian Periods, having bony plates of armor covering the head and thorax. Placoderms were among the first jawed vertebrates.
[New Latin Placodermī, class name : Greek plax, plak-, flat stone, plate; see plāk- in Indo-European roots + -derm.]placoderm (ˈplækəˌdɜːm) n (Palaeontology) any extinct bony-plated fishlike vertebrate of the class Placodermi, of Silurian to Permian times: thought to have been the earliest vertebrates with jaws[C19: from Greek plac-, plax a flat plate + -derm]plac•o•derm (ˈplæk əˌdɜrm)
n. any of various extinct jawed fishes of the class Placodermi, chiefly of the Devonian Period: many were armored in bony plates. [1855–60; < New Latin Placodermi name of the class, pl. of placodermus=placo- (< Greek; see placoid, -o-) + -dermus -derm] Thesaurus| Noun | 1. | placoderm - fish-like vertebrate with bony plates on head and upper body; dominant in seas and rivers during the Devonian; considered the earliest vertebrate with jawsaquatic vertebrate - animal living wholly or chiefly in or on waterclass Placodermi, Placodermi - extinct group of bony-plated fishes with primitive jaws |
EncyclopediaSeePlacodermiplacoderm
Words related to placodermnoun fish-like vertebrate with bony plates on head and upper bodyRelated Words- aquatic vertebrate
- class Placodermi
- Placodermi
|