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Heterochen

Reptilia - Anseriformes

Taxonomy
Heterochen was named by Short (1970). Its type is Heterochen pratensis.

It was assigned to Anseriformes by Short (1970).

Species
H. pratensis (type species), H. vicinus

Synonymy list
YearName and author
1970Heterochen Short p. 537

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
—Osteichthyes()
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
—Tetrapoda
—Reptiliomorpha
—Anthracosauria
subclassAmphibiosauriaKuhn 1967
—Cotylosauria()
—Amniota
—Sauropsida
classReptilia
subclassEureptilia()
—Romeriida
—Diapsida()
—Archosauromorpha(Huene 1946)
—Crocopoda
RankNameAuthor
—ArchosauriformesGauthier 1986
—Eucrocopoda
—Archosauria()
informalAvemetatarsalia
—Ornithodira
—Dinosauromorpha
—Dinosauriformes
—Dinosauria()
—Theropoda()
—Neotheropoda
—AverostraPaul 2002
—Tetanurae
—Coelurosauria()
—Maniraptora
—Paraves
classAves
subclassNeornithesGadow 1893
—Neognathae(Pycraft 1900)
—PangalloanseraeGauthier and de Queiroz 2001
—GalloanseraeSibley and Ahlquist 1990
superorderGalloanserimorphae
orderAnseriformesWagler 1831
genusHeterochen

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

G. †Heterochen Short 1970
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†Heterochen pratensis Short 1970
†Heterochen vicinus Kurochkin 1976
Diagnosis
ReferenceDiagnosis
L. L. Short 1970Anseriform tarsometatarsus, near the size of Anser anser, and characterized by: trochleae not spread greatly as in modern swans, geese and sheldrakes; outer surface gently curving toward distal end
(trochlea 4); trochlea 2 rather small and oval in shape in lateral view, more anterior in position than in modern geese and swans; shaft moderately robust with strong anterior and posterior lateral ridges; external ligamental prominence pronounced, causing shaft proximal to it to be concave from the anterior view; external ligamental prominence located far distally (slightly distal to distal internal end of hypotarsus); hypotarsus short, terminating distally perpendicular to shaft (square-cornered outline in inner profile); proximal foramen nearly at same level posteriorly as the opening of the inner tendinal canal; lateral shaft ridge passing to internal side of shaft distal to hypotarsus, rather than connecting with hypotarsus; hypotarsus narrow, outer tendinal groove very faintly marked and not bordered externally by a ridge, but dropping directly anteriorly to form the external surface of the shaft; and, shaft flat and dropping steeply from internal tendinal canal to external ligamental prominence.
Measurements
No measurements are available
Composition: hydroxyapatiteo
Entire body: yeso
Adult length: 10 to < 100o
Adult width: 1.0 to < 10o
Adult height: 1.0 to < 10o
Architecture: compact or denseo
Ontogeny: accretion, modification of partso
Grouping: solitaryo
Environment: terrestrialo
Locomotion: actively mobileo
Life habit: volanto
Diet: herbivoreo
Reproduction: oviparouso
Dispersal: direct/internalo
Dispersal 2: mobileo
Created: 2009-01-03 19:27:52
Modified: 2009-01-03 21:27:52
Source: o = order
References: Sedinger 1997, Marsh 1875

Age range: Barstovian or 16.30000 to 12.50000 Ma

Collections: one only


Time interval Ma Country or state Original ID and collection number
Barstovian16.3 - 12.5USA (Nebraska) H. pratensis (18123)