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Chelychelynechen quassus

Reptilia - Anseriformes - Anatidae

Taxonomy
Chelychelynechen quassus was named by Olson and James (1991). Its type specimen is USNM 389743, a partial skeleton (Associatedrostrum,mandible,and os entoglossum), and it is a 3D body fossil. Its type locality is Makewehi Dunes, which is in a Holocene interdune horizon in Hawaii. It is the type species of Chelychelynechen.

Synonymy list
YearName and author
1991Chelychelynechen quassus Olson and James p. 33 figs. Fig. 9

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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()
Tetanurae
Coelurosauria()
Maniraptora
Paraves
classAves
subclassNeornithesGadow 1893
Neognathae(Pycraft 1900)
PangalloanseraeGauthier and de Queiroz 2001
GalloanseraeSibley and Ahlquist 1990
superorderGalloanserimorphae
orderAnseriformesWagler 1831
familyAnatidaeVigors 1825
genusChelychelynechen
speciesquassus

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.

Chelychelynechen quassus Olson and James 1991
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Diagnosis
ReferenceDiagnosis
S. L. Olson and H. F. James 1991Postcraniallya typical moa-nalo. Differs from Thambetochenand Ptaiochen in the unique shape of the rostrum, which is almost as high as it is long, with the palatal surface being much broader, especially so in the spaces between the two median ridgesand the edge of the bill. The occlusal surfaceof the dentaryis correspondinglybroadand flat,and bothjaws lackthe bony tooth- like projectionsof Thambetochenand Ptaiochen.In Chelychelynechenthe nostril is reducedand orientedalmost verticallyinstead of horizontally.In lateralview of the mandible,the symphysiscurvesupwardanteriorly,ratherthanbeingstraight, the coronoid areais much higherand more expanded,with the coronoid process much betterdeveloped and more dorsallysituated,and the retroarticularprocess markedlyshorterand deeper.
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: Holocene or 0.01170 to 0.00000 Ma

Collections: one only


Time interval Ma Country or state Original ID and collection number
Holocene0.0117 - 0.0USA (Hawaii) Chelychelynechen quassus (type locality: 110076)