''Peishansaurus'' () was a
genus
Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...
of
ornithischian
Ornithischia () is an extinct order of mainly herbivorous dinosaurs characterized by a pelvic structure superficially similar to that of birds. The name ''Ornithischia'', or "bird-hipped", reflects this similarity and is derived from the Greek s ...
dinosaur
Dinosaurs are a diverse group of reptiles of the clade Dinosauria. They first appeared during the Triassic period, between 243 and 233.23 million years ago (mya), although the exact origin and timing of the evolution of dinosaurs is t ...
that lived during the
Late Cretaceous
The Late Cretaceous (100.5–66 Ma) is the younger of two epochs into which the Cretaceous Period is divided in the geologic time scale. Rock strata from this epoch form the Upper Cretaceous Series. The Cretaceous is named after ''creta'', the ...
period (late
Santonian
The Santonian is an age in the geologic timescale or a chronostratigraphic stage. It is a subdivision of the Late Cretaceous Epoch or Upper Cretaceous Series. It spans the time between 86.3 ± 0.7 mya (million years ago) and 83.6 ± 0.7 mya. The ...
-
Campanian
The Campanian is the fifth of six ages of the Late Cretaceous Epoch on the geologic timescale of the International Commission on Stratigraphy (ICS). In chronostratigraphy, it is the fifth of six stages in the Upper Cretaceous Series. Campanian s ...
stage
Stage or stages may refer to:
Acting
* Stage (theatre), a space for the performance of theatrical productions
* Theatre, a branch of the performing arts, often referred to as "the stage"
* ''The Stage'', a weekly British theatre newspaper
* Sta ...
s), roughly 85-72 million years ago.
''Peishansaurus'' was named and described by the Swedish paleontologist
Anders Birger Bohlin
Dr. Anders Birger Bohlin (26 March 1898 – 28 November 1990) was a Swedes, Swedish palaeontologist. As well as his work on dinosaurs and prehistoric mammals, Bohlin was part of the group that established the existence of Peking Man ''(Sinanthr ...
in 1953. The
type species
In zoological nomenclature, a type species (''species typica'') is the species name with which the name of a genus or subgenus is considered to be permanently taxonomically associated, i.e., the species that contains the biological type specimen ...
is ''Peishansaurus philemys''. ''Peishansaurus'' is named after
Beishan, the "Northern Mountains" in
Gansu
Gansu (, ; alternately romanized as Kansu) is a province in Northwest China. Its capital and largest city is Lanzhou, in the southeast part of the province.
The seventh-largest administrative district by area at , Gansu lies between the Tibet ...
. The
specific name ''philemys'' means "lover of turtles" from the Greek φιλέω, phileo, "to love", and ἐμύς, emys, "water turtle" in reference to the fact that at the site also the turtle ''
Peishanemys latipons'' was found, a member of the
Dermatemydidae
The Dermatemydidae are a family of turtle
Turtles are an order of reptiles known as Testudines, characterized by a special shell developed mainly from their ribs. Modern turtles are divided into two major groups, the Pleurodira (side nec ...
.
[B. Bohlin, 1953, ''Fossil reptiles from Mongolia and Kansu. Reports from the Scientific Expedition to the North-western Provinces of China under Leadership of Dr. Sven Hedin. VI. Vertebrate Palaeontology 6.'' The Sino-Swedish Expedition Publications 37, 113 pp]
In 1930 Bohlin, in the context of the Swedish-Chinese expeditions of
Sven Hedin
Sven Anders Hedin, KNO1kl RVO,Wennerholm, Eric (1978) ''Sven Hedin – En biografi'', Bonniers, Stockholm (19 February 1865 – 26 November 1952) was a Swedish geographer, topographer, explorer, photographer, travel writer and illustrator ...
, had uncovered the fossils at Ehr-chia-wu-t'ung, in the west of Gansu, in a layer of the
Minhe Formation
The Minhe Formation () is a geological formation in northwestern China, whose strata date back to the Late Cretaceous period.
Dinosaur remains are among the fossils that have been recovered from the formation.Weishampel, David B; et al. (2004). "D ...
dating from the Campanian. They consist of an about long piece of a right lower jaw with four tooth positions and a loose tooth.
The
holotype
A holotype is a single physical example (or illustration) of an organism, known to have been used when the species (or lower-ranked taxon) was formally described. It is either the single such physical example (or illustration) or one of several ...
was reported lost as of 2014.
[Arbour, Victoria Megan, 2014, ''Systematics, evolution, and biogeography of the ankylosaurid dinosaurs''. Ph.D thesis, University of Alberta]
''Peishansaurus'' is today considered a ''
nomen dubium
In binomial nomenclature, a ''nomen dubium'' (Latin for "doubtful name", plural ''nomina dubia'') is a scientific name that is of unknown or doubtful application.
Zoology
In case of a ''nomen dubium'' it may be impossible to determine whether a s ...
'', doubtful genus.
Bohlin placed it in the
Ankylosauridae
Ankylosauridae () is a family of armored dinosaurs within Ankylosauria, and is the sister group to Nodosauridae. The oldest known Ankylosaurids date to around 122 million years ago and went extinct 66 million years ago during the Cretaceous–Pal ...
, assuming the fossil represented a juvenile ankylosaurid,
but it could also be a
pachycephalosaur
Pachycephalosauria (; from Greek παχυκεφαλόσαυρος for 'thick headed lizards') is a clade of ornithischian dinosaurs. Along with Ceratopsia, it makes up the clade Marginocephalia. With the exception of two species, most pachyc ...
. In 1999,
Kenneth Carpenter
Kenneth Carpenter (born September 21, 1949, in Tokyo, Japan) is a paleontologist. He is the former director of the USU Eastern Prehistoric Museum and author or co-author of books on dinosaurs and Mesozoic life. His main research interests ar ...
considered the tooth to be similar to that of ''
Psittacosaurus
''Psittacosaurus'' ( ; "parrot lizard") is a genus of extinct ceratopsian dinosaur from the Early Cretaceous of what is now Asia, existing between 126 and 101 million years ago. It is notable for being the most species-rich non-avian dinosaur gen ...
''.
[Carpenter, K., 1999, ''Eggs, Nests, and Baby Dinosaurs. A Look at Dinosaur Reproduction'', Indiana University press, 336 pp] In 2004, Vickaryous ''et al.'' treated ''Peishansaurus'' as
Ankylosauria
Ankylosauria is a group of herbivorous dinosaurs of the order Ornithischia. It includes the great majority of dinosaurs with armor in the form of bony osteoderms, similar to turtles. Ankylosaurs were bulky quadrupeds, with short, powerful limbs. ...
''
incertae sedis
' () or ''problematica'' is a term used for a taxonomic group where its broader relationships are unknown or undefined. Alternatively, such groups are frequently referred to as "enigmatic taxa". In the system of open nomenclature, uncertainty ...
'',
[Vickaryous, M. K., Maryanska, T., and Weishampel, D. B. (2004). Chapter Seventeen: Ankylosauria. in The Dinosauria (2nd edition), Weishampel, D. B., Dodson, P., and Osmólska, H., editors. University of California Press.] and in 2016, it was treated as ?
Thyreophora
Thyreophora ("shield bearers", often known simply as "armored dinosaurs") is a group of armored ornithischian dinosaurs that lived from the Early Jurassic until the end of the Cretaceous.
Thyreophorans are characterized by the presence of body ...
''incertae sedis'' by
Arbour
Arbor(s) or Arbour(s) may refer to:
Arts and entertainment
* ''Arbor'' (installation), a 2013 public artwork in Indianapolis, Indiana, US
* Arbor, a counterweight-carrying device found in theater fly systems
* ''The Arbor'', a 1980 play by Andr ...
and
Currie
Currie ( gd, Currach, IPA: kʰuːᵲəx is a village and suburb on the outskirts of Edinburgh, Scotland, situated south west of the city centre. Formerly within the County of Midlothian, it now falls within the jurisdiction of the City of Edi ...
.
Notes
External links
Dinosauria Translation and Pronunciation Guide
Ornithischian genera
Late Cretaceous dinosaurs of Asia
Fossil taxa described in 1953
Taxa named by Birger Bohlin
Nomina dubia
{{ornithischian-stub