placoid - significado y definición. Qué es placoid
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Qué (quién) es placoid - definición

CLASS OF FISHES
Cartilaginous fish; Chondrichthian; Chondricthyes; Placoid fishes; Placoid fish; Chondrichthyans; Cartilaginous fishes; Placoid Fishes; Chondrichthytes; Chondrichthyte; Chondrichthye; Chondrichthyan; Cartilaginous Fish; Cartilaginous Fishes; Cartilaginous fishe; Chondropterygii; Chondrichtyan; Cartilagenous fish
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  • url=https://books.google.com/books?id=VThUUUtM8A4C&pg=PA185 }}</ref>}}
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  • right
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  • rostral]] end of the skate is to the right.
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Placoid         
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  • The scales of a typical teleost fish, like this [[Atlantic herring]], are silvered.
  • Barnacle growth on boat hull
  • Queensland lungfish}}
  • Effects of turbulent flow on boundary layer
  • 300px
  • 100px
  • [[Lobe-finned fish]]es, like this preserved [[coelacanth]], have elasmoid scales.}}
  • url =https://books.google.com/books?id=-4keAAAAIAAJ&q=Eleotris%20butis&pg=PA306}}</ref>
  • Ctenoid scales from a [[perch]] vary from the medial (middle of the fish), to dorsal (top), to caudal (tail end) scales.
  • Placoid scales as viewed through an electron microscope. Also called dermal denticles, these are structurally homologous with vertebrate teeth.
  • Dorsal view of right-bending (left) and left-bending (right) jaw morphs adapted for eating fish scales<ref name=Lee2012 />
  • [[Pineconefish]] are covered in scutes.}}
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  • The herring's reflectors are nearly vertical for camouflage from the side.
  •  The deep sea hatchetfish has scales which reflect blue light.
  •  Mineral texture of ganoine layers in the scales of an [[alligator gar]]
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  •  Geometrically laid out ganoid scales on a [[bichir]]
  • Diagram of the side profile of a shark denticle showing a vortex in the wake downstream of the denticle
  •  The scales of this [[spotted gar]] appear glassy due to ganoine.
  • Left to right: denticles of ''[[Paralogania]]'' (?), ''[[Shielia]] taiti'', ''[[Lanarkia]] horrida''
  • Cartilaginous fishes, like this [[tiger shark]], have placoid scales (dermal denticles).}}
SMALL RIGID PLATE THAT GROWS OUT OF THE SKIN OF A FISH
Dermal denticle; Placoid scale; Ctenoid; Cteniod; Ganoid; Ctenoid Scales:; Cycloid scale; Placoid scales; Cteniform; Ctenoid scale; Dermal denticles; Cosmoid scale; Ganoid scale; Elasmoid scale; Leptoid scale; Cosmoid scales; Placoid; Fish scales; Dermal teeth; Cycloid scales; Fish Scale; Scales on a fish
·noun One of the Placoides.
II. Placoid ·noun Any fish having placoid scales, as the sharks.
III. Placoid ·adj Platelike; having irregular, platelike, bony scales, often bearing spines; pertaining to the placoids.
placoid         
  • 180px
  • 220px
  • 150px
  • The scales of a typical teleost fish, like this [[Atlantic herring]], are silvered.
  • Barnacle growth on boat hull
  • Queensland lungfish}}
  • Effects of turbulent flow on boundary layer
  • 300px
  • 100px
  • [[Lobe-finned fish]]es, like this preserved [[coelacanth]], have elasmoid scales.}}
  • url =https://books.google.com/books?id=-4keAAAAIAAJ&q=Eleotris%20butis&pg=PA306}}</ref>
  • Ctenoid scales from a [[perch]] vary from the medial (middle of the fish), to dorsal (top), to caudal (tail end) scales.
  • Placoid scales as viewed through an electron microscope. Also called dermal denticles, these are structurally homologous with vertebrate teeth.
  • Dorsal view of right-bending (left) and left-bending (right) jaw morphs adapted for eating fish scales<ref name=Lee2012 />
  • [[Pineconefish]] are covered in scutes.}}
  • 180px
  • 200px
  • The herring's reflectors are nearly vertical for camouflage from the side.
  •  The deep sea hatchetfish has scales which reflect blue light.
  •  Mineral texture of ganoine layers in the scales of an [[alligator gar]]
  • 60px
  •  Geometrically laid out ganoid scales on a [[bichir]]
  • Diagram of the side profile of a shark denticle showing a vortex in the wake downstream of the denticle
  •  The scales of this [[spotted gar]] appear glassy due to ganoine.
  • Left to right: denticles of ''[[Paralogania]]'' (?), ''[[Shielia]] taiti'', ''[[Lanarkia]] horrida''
  • Cartilaginous fishes, like this [[tiger shark]], have placoid scales (dermal denticles).}}
SMALL RIGID PLATE THAT GROWS OUT OF THE SKIN OF A FISH
Dermal denticle; Placoid scale; Ctenoid; Cteniod; Ganoid; Ctenoid Scales:; Cycloid scale; Placoid scales; Cteniform; Ctenoid scale; Dermal denticles; Cosmoid scale; Ganoid scale; Elasmoid scale; Leptoid scale; Cosmoid scales; Placoid; Fish scales; Dermal teeth; Cycloid scales; Fish Scale; Scales on a fish
['plak??d]
¦ adjective Zoology (of fish scales) tooth-like, being made of dentine with enamel, as in sharks and rays. Compare with ctenoid and ganoid.
Origin
C19: from Gk plax, plak- 'flat plate' + -oid.
Ganoid         
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  • 150px
  • The scales of a typical teleost fish, like this [[Atlantic herring]], are silvered.
  • Barnacle growth on boat hull
  • Queensland lungfish}}
  • Effects of turbulent flow on boundary layer
  • 300px
  • 100px
  • [[Lobe-finned fish]]es, like this preserved [[coelacanth]], have elasmoid scales.}}
  • url =https://books.google.com/books?id=-4keAAAAIAAJ&q=Eleotris%20butis&pg=PA306}}</ref>
  • Ctenoid scales from a [[perch]] vary from the medial (middle of the fish), to dorsal (top), to caudal (tail end) scales.
  • Placoid scales as viewed through an electron microscope. Also called dermal denticles, these are structurally homologous with vertebrate teeth.
  • Dorsal view of right-bending (left) and left-bending (right) jaw morphs adapted for eating fish scales<ref name=Lee2012 />
  • [[Pineconefish]] are covered in scutes.}}
  • 180px
  • 200px
  • The herring's reflectors are nearly vertical for camouflage from the side.
  •  The deep sea hatchetfish has scales which reflect blue light.
  •  Mineral texture of ganoine layers in the scales of an [[alligator gar]]
  • 60px
  •  Geometrically laid out ganoid scales on a [[bichir]]
  • Diagram of the side profile of a shark denticle showing a vortex in the wake downstream of the denticle
  •  The scales of this [[spotted gar]] appear glassy due to ganoine.
  • Left to right: denticles of ''[[Paralogania]]'' (?), ''[[Shielia]] taiti'', ''[[Lanarkia]] horrida''
  • Cartilaginous fishes, like this [[tiger shark]], have placoid scales (dermal denticles).}}
SMALL RIGID PLATE THAT GROWS OUT OF THE SKIN OF A FISH
Dermal denticle; Placoid scale; Ctenoid; Cteniod; Ganoid; Ctenoid Scales:; Cycloid scale; Placoid scales; Cteniform; Ctenoid scale; Dermal denticles; Cosmoid scale; Ganoid scale; Elasmoid scale; Leptoid scale; Cosmoid scales; Placoid; Fish scales; Dermal teeth; Cycloid scales; Fish Scale; Scales on a fish
·adj Of or pertaining to Ganoidei.
- ·noun One of the Ganoidei.

Wikipedia

Chondrichthyes

Chondrichthyes (; from Ancient Greek χόνδρος (khóndros) 'cartilage', and ἰχθύς (ikhthús) 'fish') is a class that contains the cartilaginous fishes that have skeletons primarily composed of cartilage. They can be contrasted with the Osteichthyes or bony fishes, which have skeletons primarily composed of bone tissue. Chondrichthyes are jawed vertebrates with paired fins, paired nares, scales, and a heart with its chambers in series. Extant chondrichthyes range in size from the 10 cm (3.9 in) finless sleeper ray to the 10 m (32 ft) whale shark.

The class is divided into two subclasses: Elasmobranchii (sharks, rays, skates, and sawfish) and Holocephali (chimaeras, sometimes called ghost sharks, which are sometimes separated into their own class).

Within the infraphylum Gnathostomata, cartilaginous fishes are distinct from all other jawed vertebrates.