英文字典中文字典


英文字典中文字典51ZiDian.com



中文字典辞典   英文字典 a   b   c   d   e   f   g   h   i   j   k   l   m   n   o   p   q   r   s   t   u   v   w   x   y   z       







请输入英文单字，中文词皆可：

安装中文字典英文字典查询工具!


中文字典英文字典工具:
选择颜色:
输入中英文单字

































































英文字典中文字典相关资料:


  • Chondrichthyes - Wikipedia
    Chondrichthyes are aquatic vertebrates with paired fins, paired nares, placoid scales, conus arteriosus in the heart, and a lack of opercula and swim bladders Within the infraphylum Gnathostomata, cartilaginous fishes are distinct from all other jawed vertebrates
  • Chondrichthyan | Definition, Species, Facts | Britannica
    chondrichthyan, (class Chondrichthyes), any member of the diverse group of cartilaginous fishes that includes the sharks, skates, rays, and chimaeras The class is one of the two great groups of living fishes, the other being the osteichthians, or bony fishes
  • Chondrichthyes - New World Encyclopedia
    The Chondrichthyes or cartilaginous fishes are a major class of jawed fish that includes the sharks, rays, and skates, and whose skeleton is characterized by rubbery cartilage, which is very light and flexible, rather than bone, as in the bony fishes (class Osteichthyes (such as cod or salmon))
  • Chondrichthyes - Rays, Sharks, Skates, Chimaeras
    There are around 1,000 species in this class of fish The species in this class have a flexible skeleton made of cartilage instead of bone Cartilage is the flexible substance found that gives human noses and ears their shape! Only their teeth, and sometimes their vertebrae, have calcium in them!
  • Chondrichthyes – Characteristics, Classification Examples
    Chondrichthyes, derived from the Greek words “chondr” meaning cartilage and “ichthys” meaning fish, refers to a class of jawed fishes characterized by their cartilaginous skeletons
  • What are the eight major characteristics of the class Chondrichthyes . . .
    Perhaps the most defining characteristic of Chondrichthyes is their cartilaginous skeleton While cartilage is lighter and more flexible than bone, it is still strong enough to provide support and protection The cartilage may be partially calcified, providing additional strength
  • Chondrichthyes
    Sharks, skates, and rays make up Chondrichthyes, or "cartilaginous fish " First appearing on Earth almost 450 million years ago, cartilaginous fish today include both fearsome predators and harmless mollusc-eaters
  • 3_Chondrichthyes - California State University, Northridge
    Chondrichthyes are not ancestral to bony fishes based on DNA instead of morphology
  • Chondrichthyes - Cartilaginous Fish, Classification, Characteristics . . .
    Chondrichthyes are a class of vertebrates known as cartilaginous fishes The notochord is present throughout life, and the skeleton remains cartilaginous instead of forming a bony vertebral column (osteichthyes) This unique trait separates cartilaginous fishes from other vertebrates
  • Chondrichthyes (cartilaginous fish, including sharks, rays chimaeras)
    Cartilaginous fishes (Class Chondrichthyes, from Greek chondros, cartilage, and ichthos, fish) are a class of aquatic, gill-breathing, finned vertebrates (animals with a vertebral column or `backbone'), equivalent to the bony fishes (Class Osteichthyes: osteos, bone, and ichthos, fish)





中文字典-英文字典  2005-2009