Cryptodira
E77477
Cryptodira is a major suborder of turtles characterized by their ability to retract the head straight back into the shell by bending the neck in a vertical S-shaped curve.
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
taxon
→
turtle suborder → |
| characteristic |
cervical vertebrae allow vertical flexion
→
neck bends in vertical S-shaped curve → retract head straight back into shell → |
| clade |
Casichelydia
→
Testudinata → |
| class |
Reptilia
→
|
| commonName |
hidden-neck turtles
→
|
| contains |
box turtles
→
pond turtles → sea turtles → snapping turtles → softshell turtles → tortoises → |
| diagnosticFeature |
dorsoventral neck flexion
→
specialized cervical vertebrae articulation → |
| distinguishedFrom |
Pleurodira by vertical neck retraction
→
|
| distribution |
worldwide
→
|
| etymology |
from Greek 'kryptos' (hidden) and 'deirē' (neck)
→
|
| extant |
true
→
|
| geologicFirstAppearance |
Jurassic period
→
|
| habitat |
freshwater environments
→
marine environments → terrestrial environments → |
| hasLivingRepresentatives |
true
→
|
| headRetraction |
into shell between shoulder girdles
→
|
| higherClassification |
Cryptodirans
→
|
| includesFamily |
Cheloniidae
→
Chelydridae → Dermochelyidae → Emydidae → Testudinidae → Trionychidae → |
| includesMostLivingTurtles |
true
→
|
| infraclass |
Archelosauria
→
|
| kingdom |
Animalia
→
|
| neckRetractionMode |
vertical
→
|
| opposedBy |
side-necked retraction of Pleurodira
→
|
| parentTaxon |
Testudines
→
|
| phylum |
Chordata
→
|
| sisterGroup |
Pleurodira
→
|
| subclass |
Diapsida
→
|
| taxonRank |
suborder
→
|
| usedIn |
herpetology
→
vertebrate paleontology → |
Referenced by (2)
| Subject (surface form when different) | Predicate |
|---|---|
|
Kinixys
→
|
belongsToClade |
|
Testudinoidea
→
|
suborder |