Chondrichthyes
E85554
Chondrichthyes is a class of cartilaginous fishes, including sharks, rays, and skates, characterized by skeletons made primarily of cartilage rather than bone.
Statements (50)
| Predicate | Object |
|---|---|
| instanceOf |
group of cartilaginous fishes
→
taxonomic class → |
| bodyCovering |
dermal denticles
→
|
| circulatorySystem |
closed circulatory system
→
|
| commonName |
cartilaginous fishes
→
|
| ecologicalRole |
mesopredators in marine ecosystems
→
top predators in marine ecosystems → |
| fertilizationType |
internal fertilization
→
|
| firstAppearance |
Devonian period
→
|
| habitat |
marine environments
→
some freshwater environments → |
| hasCharacteristic |
cartilaginous endoskeleton
→
cartilaginous vertebral column → electroreception via ampullae of Lorenzini in many species → heterocercal tail in many species → internal fertilization → lack of swim bladder → oily liver for buoyancy → placoid scales → spiral valve intestine → well-developed olfactory organs → |
| hasEconomicImportance |
commercial fisheries
→
ecotourism → recreational fisheries → |
| hasSubclass |
Elasmobranchii
→
Holocephali → |
| heartChambers |
two-chambered heart
→
|
| includes |
chimaeras
→
rays → sharks → skates → |
| jawType |
movable jaws
→
|
| kingdom |
Animalia
→
|
| notableGroup |
Batoidea
→
Selachii → |
| phylum |
Chordata
→
|
| reproductionMode |
oviparous in some species
→
ovoviviparous in some species → viviparous in some species → |
| respiration |
gills
→
|
| sensorySystem |
lateral line system
→
|
| skeletonContains |
cartilage
→
|
| skeletonLacks |
true bone
→
|
| skeletonType |
cartilaginous skeleton
→
|
| subphylum |
Vertebrata
→
|
| threatStatus |
many species threatened by bycatch
→
many species threatened by habitat degradation → many species threatened by overfishing → |
| timeOfOrigin |
Paleozoic era
→
|
| toothType |
replaceable teeth in many species
→
|
Referenced by (2)
| Subject (surface form when different) | Predicate |
|---|---|
|
Gnathostomata
→
|
includes |
|
Vertebrata
→
|
includesTaxon |