Placodermi
E413360
Placodermi is an extinct class of armored prehistoric fishes that were among the earliest jawed vertebrates.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Placodermi canonical | 1 |
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
armored fishes
ⓘ
extinct class of fishes ⓘ jawed vertebrates ⓘ |
| bodyPlan | heavily armored anterior body and relatively unarmored tail ⓘ |
| characteristic |
bony armor on head and thorax
ⓘ
cartilaginous internal skeleton ⓘ early development of jaws ⓘ jointed armored head and thoracic shields ⓘ paired pectoral fins ⓘ tooth plates instead of true teeth ⓘ |
| clade | Gnathostomata ⓘ |
| discoveredBy | recognized as a distinct group in the 19th century ⓘ |
| ecologicalRole |
benthic feeders
ⓘ
diverse marine predators ⓘ pelagic swimmers ⓘ |
| extinctionCause | Late Devonian biotic crisis ⓘ |
| firstAppearance |
Late Silurian
ⓘ
Silurian ⓘ
surface form:
Silurian period
|
| fossilRecord | abundant in Devonian strata ⓘ |
| geographicDistribution |
freshwater environments
ⓘ
worldwide marine environments ⓘ |
| importance |
among the earliest known jawed vertebrates
ⓘ
key group for understanding evolution of jaws ⓘ |
| included |
Antiarchi
ⓘ
Arthrodira ⓘ Bothriolepis ⓘ Coccosteus ⓘ Dunkleosteus ⓘ Petalichthyida ⓘ Phlyctaeniida ⓘ Ptyctodontida ⓘ Rhenanida ⓘ |
| kingdom | Animalia ⓘ |
| lacked |
true endochondral bone in most forms
ⓘ
true teeth ⓘ |
| lastAppearance |
Late Devonian
ⓘ
end-Devonian extinction ⓘ |
| notableSpecies |
Dunkleosteus
ⓘ
surface form:
Dunkleosteus terrelli
|
| phylum | Chordata ⓘ |
| reproduction |
evidence of viviparity in some taxa
ⓘ
some groups showed internal fertilization ⓘ |
| scientificNameAuthorship | Louis Agassiz ⓘ |
| sizeRange | from small bottom-dwellers to giant predators over 6 meters long ⓘ |
| status | extinct ⓘ |
| subphylum | Vertebrata ⓘ |
| taxonRank | class ⓘ |
| temporalRange | Silurian–Devonian ⓘ |
| typeLocality | Devonian deposits of Europe ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.