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.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Cryptodira canonical | 11 |
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
ⓘ
Testudines ⓘ
surface form:
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
ⓘ
surface form:
Jurassic period
|
| habitat |
freshwater environments
ⓘ
marine environments ⓘ terrestrial environments ⓘ |
| hasLivingRepresentatives | true ⓘ |
| headRetraction | into shell between shoulder girdles ⓘ |
| higherClassification | Cryptodirans ⓘ |
| includesFamily |
Cheloniidae
ⓘ
Chelydridae ⓘ Dermochelyidae ⓘ Testudinoidea ⓘ
surface form:
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 (11)
Full triples — surface form annotated when it differs from this entity's canonical label.