Paleobiota of the Yixian Formation
The Yixian Formation (simplified Chinese: 义县组; traditional Chinese: 義縣組; pinyin: Yìxiàn zǔ) is a geological formation in Jinzhou, Liaoning, People's Republic of China, that spans about 1.6 million years during the early Cretaceous period (Barremian-Aptian stage). It is known for its fossils, listed below.
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The Yixian Formation is divided into the following subunits: (ages from Zhong et al., 2021[1] unless otherwise noted)
- Upper Yixian (124.1 Ma) ("Jingangshan Bed") ("Dawangzhangzi Bed")
- Upper Lava Unit
- Jianshangou Unit (125.46 Ma)
- Lower Lava Unit
- Lujiatun Unit (125.76–125.68 Ma)
Sauropods
Genus | Species | County | Member | Material | Notes | Images |
---|---|---|---|---|---|---|
D. dongi |
Beipiao | Jianshangou Bed |
Partial postcrania[2] |
A basal titanosauriform |
| |
cf. Euhelopus |
cf. E. sp. |
Lujiatun Bed |
Isolated teeth[3] |
A basal titanosauriform | ||
L. sinensis |
nearly complete skeleton[4] |
A basal titanosauriform | ||||
Ruixinia | R. zhangi | Beipiao | A partial articulated skeleton[5] | A somphospondylan titanosauriform | ||
Sauropoda spp. |
Lujiatun & Jianshangou Beds |
Isolated vertebrae and teeth[6] |
One or more species of sauropods, possibly titanosaurs, have been recovered from the Yixian Formation, though most remain undescribed[3] | |||
Ornithischians
The dinosaurs listed below were compiled in a survey by Xu and Norell in 2006, unless otherwise noted.[6]
Genus | Species | County | Member | Material | Notes | Images |
---|---|---|---|---|---|---|
B. yixianensis |
Jianshangou Bed |
An ornithopod |
| |||
Changmiania[7] | C. liaoningensis | Lujiatun Bed | Two nearly complete skeletons | A basal ornithopod that may have dug burrows | ||
J. shangyuanensis |
Lujiatun Bed |
"Skull with associated vertebrae and hindlimb, skull with cervical vertebrae."[8] |
An ornithopod | |||
J. yangi |
Yixian |
Dawangzhangzi Bed |
"Nearly complete skull and skeleton."[9] |
An ornithopod | ||
L. yanzigouensis |
Beipiao |
Lujiatun Bed |
"[Two] nearly complete skulls, juvenile to adult."[10] |
A ceratopsian | ||
L. paradoxus |
Yixian |
Dawangzhangzi Bed |
"Partial skull [and] skeleton."[11] |
A small ankylosaur | ||
Beipiao |
Lujiatun & Jianshangou Beds |
Thousands of specimens in the Lujiatun Bed, somewhat less common in the Jianshangou Bed |
A ceratopsian | |||
Theropods
The dinosaurs listed below were compiled in a survey by Xu and Norell in 2006, unless otherwise noted.[6]
Avialans
Color key
|
Notes Uncertain or tentative taxa are in small text; |
Genus | Species | County | Member | Material | Notes | Images |
---|---|---|---|---|---|---|
Abitusavis[12] | A. lii | "Nearly complete skeleton."[12] | ||||
A. spathula |
Dawangzhangzi Bed |
An early, advanced short-tailed bird (ornithuran)[13] | ||||
C. hengdaoziensis[14] |
Jianshangou Bed |
"Nearly complete skeleton."[14] |
||||
C. chuonzhous |
Junior synonym of Confuciusornis sanctus[15] | |||||
C. dui[16] |
Jianshangou Bed |
"[Two] skeletons."[16] |
||||
C. feducciai[17] |
Jianshangou Bed |
|||||
C. sanctus[16] |
Jianshangou and Dawangzhangzi Beds |
"Hundreds of complete skeletons."[16] |
A primitive short-tailed bird (pygostylian), also present in the Jiufotang Formation | |||
C. suniae |
Junior synonym of Confuciusornis sanctus[15] | |||||
D. liweii |
Dawangzhangzi Bed |
|||||
E. buhleri |
Jianshangou Bed |
"Nearly complete skeleton."[19] |
||||
E. edentulata |
Dawangzhangzi Bed |
"nearly complete skeleton with skull"[20] |
An ornithuromorph | |||
Iteravis |
I. huchzermeyeri |
An ornithuromorph | ||||
J. yixianensis |
Jianshangou Bed |
A pygostylian, a junior synonym of Confuciusornis sanctus[21] | ||||
J. zhangjiyingia |
Jianshangou Bed |
Junior synonym of C. sanctus | ||||
J. orientalis |
Jianshangou Bed |
A basal avialan, also present in the Jiufotang Formation[22] | ||||
H. longicresta |
Jianshangou and Dawangzhangzi Beds[23] |
4 specimens[23] |
An ornithuromorph[24] | |||
J. luahera |
Previously regarded as Yixian, horizon reassigned to the Huajiying Formation by Jin et al., 2008.[25] | |||||
L. longidigitris |
Lujiatun Bed |
"Partial skeleton."[26] |
An enantiornithine.[27] | |||
L. delicatus |
Dawangzhangzi Bed |
Considered a nomen dubium because the name is based on remains of a hatchling entantiornithine and cannot be confidently matched with the adult form.[28] | ||||
L. parvus |
Dawangzhangzi Bed |
Junior objective synonym of Liaoxiornis delicatus, a nomen dubium.[28] | ||||
L. houi |
Dawangzhangzi Bed |
An ornithuromorph[24] | ||||
L. hani |
bed unknown |
An enantiornithine | ||||
P. fengningensis |
Previously regarded as Yixian, horizon reassigned to the Huajiying Formation by Jin et al., 2008.[25] | |||||
M. parvus |
Partial skeleton.[29] |
An immature female enantiornithine preserved with medullary bone tissue.[29] | ||||
S. cooperorum |
Dawangzhangzi Bed |
An enantiornithine.[30] | ||||
V. hebeiensis |
Previously regarded as Yixian, horizon reassigned to the Huajiying Formation by Jin et al., 2008.[25] | |||||
Yixianosaurus | Y. longimanus | Dawangzhangzi Bed | An anchiornithid | |||
Z. haoae |
Dawangzhangzi Bed |
A primitive avialan with a short but non-pygostylian tail[31] |
Dromaeosaurs and troodontids
Genus | Species | County | Member | Material | Notes | Images |
---|---|---|---|---|---|---|
C. yangi |
Jianchang |
A complete articulated specimen with extensive feathering.[32] |
| |||
Daliansaurus | D. liaoningensis | Beipiao | Lujiatun Bed | A very complete specimen.[33] | A troodontid | |
G. lujiatunensis |
Beipiao |
Lujiatun Bed |
An incomplete specimen. |
A dromaeosaurid | ||
J. tengi |
Beipiao |
Dawangzhangzi Bed |
A very complete specimen with feather impressions.[34] |
A troodontid | ||
Liaoningvenator | L. curriei | Beipiao | A very complete specimen. | A troodontid | ||
M. long |
Beipiao |
Lujiatun Bed |
A small troodontid fossilized in a sleeping position | |||
S. haoiana |
Yixian |
Dawangzhangzi Bed |
Might be a junior synonym of Sinornithosaurus millenii. | |||
S. millenii |
Beipiao |
Jianshangou Bed |
Three specimens with skulls and postcrania, two with preserved feathers.[35] Feathered integument is also preserved.[35][36] |
A dromaeosaurid, the first ever found with feather impressions. | ||
S. changii |
Beipiao |
Lujiatun Bed |
Three specimens with partial skulls and postcrania.[37][38] Hundreds of additional specimens known but undescribed. |
A troodontid | ||
S. magnodens |
Beipiao |
Lujiatun Bed |
A troodontid | |||
T. ostromi |
Lingyuan |
Dawangzhangzi Bed |
A dromaeosaurid | |||
Z. suni |
Jianchang |
One nearly complete skeleton with preserved feathers, including long tail feathers and large wing feathers. |
A dromaeosaurid | |||
Z. yangi |
Lingyuan |
A partial skeleton including an arm, both legs, vertebrae, ribs and most of the tail.[40] |
A microraptorian dromaeosaurid with very long legs.[40] | |||
Undescribed deinonychosaur/possible troodontid |
Dawangzhangzi Bed |
One specimen with feather imprints |
A possible troodontid.[41] | |||
Undescribed troodontid |
Specimen CAGS-IG01-004 |
Lujiatun Bed |
Skull and partial skeleton |
A troodontid similar to Mei.[42] | ||
Unnamed dromaeosaurid |
Specimen NGMC 91 |
Lingyuan |
Dawangzhangzi Bed |
Complete specimen with feather imprints |
A juvenile dromaeosaurid that may be a specimen of Sinornithosaurus millenii.[43][44] Informally nicknamed "Dave". | |
Other theropods
Color key
|
Notes Uncertain or tentative taxa are in small text; |
Genus | Species | County | Member | Material | Notes | Images |
---|---|---|---|---|---|---|
B. inexpectus |
Jianshangou Bed |
"Incomplete skeleton with integument."[45] |
| |||
C. dongi |
Beipiao |
Jianshangou Bed |
"[One] partial postcranium with feather imprints."[46] |
|||
C. zoui |
Beipiao |
Jianshangou Bed |
Common, only over a small region | |||
C. sp.[47] |
||||||
D. paradoxus |
Beipiao |
Lujiatun & Jianshangou Bed |
Rare |
|||
lower Jianshangou Bed |
Footprints belonging to the Grallator form taxon, belonging to a small theropod. Of known Yixian theropods, the footprints most closely match Caudipteryx.[48] | |||||
H. qingyi |
Beipiao |
Lujiatun |
A primitive ornithomimosaur[49] | |||
H. orientalis |
Beipiao |
Jianshangou Bed |
||||
I. gauthieri |
Beipiao |
Lujiatun Bed |
"[One] skull [and a] partial cervical."[46] |
An oviraptorosaur | ||
Jianchangosaurus | J. yixianensis | Jianchang | A nearly complete juvenile specimen with feather impressions.[50] | A therizinosaur | ||
N. wangi |
Complete skeleton with feather impressions.[51] |
An oviraptorosaur | ||||
P. robusta |
Beipiao |
Jianshangou Bed |
"Nearly complete skull and skeleton, at least [two] individuals."[52] |
A possible relative of Incisivosaurus | ||
R. kriegsteini |
A tyrannosaurid, probably from higher Mongolian strata. | |||||
S. heilmanni |
Initially reported from the Dawangzhangzi Bed, probably from the Daohugou Beds instead.[53] | |||||
S. orientalis |
Beipiao |
Lujiatun Bed |
"Articulated skull and incomplete skeleton."[54] |
A primitive ornithomimosaur | ||
S. yixianensis |
Two specimens |
An oviraptorosaur, also present in the Jiufotang Formation[55] | ||||
S. gigas |
Beipiao |
Jianshangou Bed |
A large compsognathid | |||
S. prima |
Beipiao & Lingyuan |
Jianshangou & Dawangzhangzi Beds |
A compsognathid. The first non-avian dinosaur found with feather impressions. | |||
S.? sp. |
Beipiao |
Jianshangou Bed |
One specimen (GMV 2124) with partial skull, postcrania, and preserved feathers |
An unnamed coelurosaur originally described as a specimen of Sinosauropteryx, later found to be a new genus and species.[58] | ||
X. ganqi |
Liaoning |
Dakangpu Bed |
One nearly complete specimen (IVPP V13390), minus the head |
|||
Y. huali |
Unknown |
Three nearly complete skeletons of various ages |
A large tyrannosauroid[60] | |||
Unnamed theropod |
Not yet described |
Lujiatun Bed |
Partial post-cranial skeleton[61] |
|||
Pterosaurs
The pterosaurs listed below were compiled in a survey by Wang and Zhou in 2006, unless otherwise noted.[63]
Genus | Species | County | Member | Material | Notes | Images |
---|---|---|---|---|---|---|
B. chenianus |
Jianshangou Bed |
A ctenochasmatid |
| |||
B. cuiae |
Jianshangou Bed |
A boreopterid | ||||
C. grabaui |
Dawangzhangzi Bed |
A ctenochasmatid | ||||
E. prolatus |
Jianshangou Bed[65] |
A ctenochasmatid | ||||
Eopteranodon | E. lii[66] | Beipiao | A tapejarid | |||
E. yixianensis[67] | Beipiao | A tapejarid | ||||
E. yangi |
Jianshangou Bed |
A ctenochasmatid | ||||
G. changae[65] |
Jianshangou Bed[65] |
A ctenochasmatid | ||||
G. jingangshanensis |
Jianshangou Bed |
A ctenochasmatid | ||||
Haopterus |
H. gracilis |
Jianshangou Bed |
An ornithocheirid | |||
Luchibang[69] | L. xingzhe | One nearly complete articulated skeleton (ELDM 1000) | An istiodactylid, the most complete known | |||
M. zhuiana |
Lujiatun bed? |
A ctenochasmatid | ||||
N. liuae |
Jianshangou or Dawangzhangzi bed |
A pterodactyloid[70] | ||||
Nurhachius | N. sp. | Jingangshan Member[71] | An incomplete specimen[71] | An istiodactylid | ||
P. qiui |
Jianshangou Bed |
A ctenochasmatid[65] | ||||
Z. longirostris |
Jianshangou Bed |
A boreopterid.[72] May be adult form of Boreopterus.[73] | ||||
Misc. reptiles
Choristoderans
Color key
|
Notes Uncertain or tentative taxa are in small text; |
Genus | Species | County | Member | Material | Notes | Images |
---|---|---|---|---|---|---|
H. lingyuanensis |
Dawangzhangzi Bed |
| ||||
H. baitaigouensis |
Jingangshan Bed |
Thousands of specimens |
||||
M. splendens |
Dawangzhangzi Bed |
|||||
S. lingyuanensis |
Dawangzhangzi Bed |
Junior synonym of Hyphalosaurus lingyuanensis | ||||
Lizards
Genus | Species | County | Member | Material | Notes | Images |
---|---|---|---|---|---|---|
D. longidigitus |
Jianshangou Bed |
A lizard related to shinisaurs |
| |||
L. acanthocaudata[74] |
Jianshangou or Dawangzhangzi bed |
A lizard related to geckos and skinks | ||||
X. zhaoi |
Jianshangou Bed |
A gliding lizard related to chameleons and dragon lizards | ||||
Y. tenuis |
Dawangzhangzi & Jingangshan Beds |
A lizard related to geckos and skinks | ||||
Turtles
Color key
|
Notes Uncertain or tentative taxa are in small text; |
Genus | Species | County | Member | Material | Notes | Images |
---|---|---|---|---|---|---|
M. liaoxiensis[75] |
Jianshangou Bed |
Reclassified as Ordosemys liaoxiensis[76] |
| |||
M. manchoukuoensis[15] |
Jingangshan Bed |
|||||
O. liaoxiensis[76] |
Jianshangou Bed |
|||||
Mammals
Color key
|
Notes Uncertain or tentative taxa are in small text; |
The mammals listed below were compiled in a survey by Meng and colleagues in 2006, unless otherwise noted.[77]
Genus | Species | County | Member | Material | Notes | Images |
---|---|---|---|---|---|---|
A. yanensis[78] |
Beipiao |
Lujiatun Bed |
A eutherian |
| ||
A. cifellii |
Lingyuan |
Dawangzhangzi Bed |
A spalacotheriid "symmetrodont" | |||
Ambolestes[79] | A. zhoui | Nincheng | Jianshangou Bed | A eutherian | ||
C. lii |
Lingyuan |
Dawangzhangzi Bed |
A eutriconodont | |||
E. scansoria |
Lingyuan |
Dawangzhangzi Bed |
A tribosphenidan, possibly a eutherian or stem-therian | |||
G. zofiae |
Beipiao |
Lujiatun Bed |
A gobiconodont | |||
G. luoianus[81] |
Lujiatun Bed |
A gobiconodont; junior synonym of G. zofiae | ||||
J. jenkinsi |
Chaoyang |
Jianshangou Bed |
A eutriconodont | |||
J. liaoningensis |
Beipiao |
Lujiatun Bed |
An amphidontid | |||
Jueconodon[83] |
J. cheni |
A eutriconodont | ||||
M. sinensis |
Chaoyang |
Jianshangou Bed |
A zhangeotheriid "symmetrodont" | |||
M. asiaticus[84] |
Beipiao |
Lujiatun Bed |
A zhangeotheriid "symmetrodont" | |||
Meemannodon |
M. lujiatunensis |
Beipiao |
Lujiatun Bed |
A gobiconodont | ||
Origolestes | O. lii | A zhangeotheriid "symmetrodont" | ||||
R. giganticus |
Beipiao |
Lujiatun Bed |
A gobiconodont | |||
R. robustus |
Beipiao |
Lujiatun Bed |
A large gobiconodont, which ate small dinosaurs | |||
S. lingyuanensis |
Lingyuan |
Jianshangou and Dawangzhangzi Beds |
A multituberculate | |||
S. szalayi |
Lingyuan |
Dawangzhangzi Bed |
A therian, initially interpreted as a metatherian and later reinterpreted as a eutherian | |||
Y. allini[85] |
Fengning[85] |
A eutricondodont | ||||
Z. quinquecuspidens |
Chaoyang |
Jianshangou Bed |
A zhangeotheriid "symmetrodont" | |||
Amphibians
Color key
|
Notes Uncertain or tentative taxa are in small text; |
Genus | Species | County | Member | Material | Notes | Images |
---|---|---|---|---|---|---|
C. sanyanensis |
Sihetun |
Jianshangou Bed |
Junior synonym of Liaobatrachus |
| ||
L. subsolanus |
Paozhanggou |
Fengshan Bed |
A urodelan | |||
L. grabaui |
Sihetun |
Jianshangou Bed |
A spadefoot toad | |||
L. zhaoi |
Beipiao & Heitizigou |
Lujiatun Bed & Jianshangou Bed |
A spadefoot toad | |||
Mesophryne |
M. beipiaoensis |
Beipiao & Heitizigou |
Lujiatun Bed & Jianshangou Bed |
Junior synonym of Liaobatrachus | ||
S. fengshanensis |
Paozhanggou |
Fengshan Bed |
A urodelan | |||
Fish
Genus | Species | County | Member | Abundance | Notes | Images |
---|---|---|---|---|---|---|
Hybodontoidea indet. |
Family, genus and species indeterminate |
An elasmobranch known from a single dorsal fin spine[86] |
| |||
L. davidi |
Jianshangou & Dawangzhangzi Beds |
Also present in the Jiufotang Formation & Huajiying Formation |
||||
L. muroii |
Jingangshan Bed |
|||||
L. sinensis |
Jianshangou Bed |
|||||
M. mengae |
A lamprey | |||||
P. pani |
Jianshangou & Dawangzhangzi Bed |
Also present in the Jiufotang Formation |
A peipiaosteid fish related to sturgeons | |||
P. liui |
Dawangzhangzi Bed |
Also present in the Jiufotang & Huajiying Formations |
||||
S. zdanskyi |
Jianshangou Bed |
A bowfin | ||||
Yanosteus |
Y. longidorsalis |
Also present in the Huajiying Formation |
A peipiaosteid | |||
Invertebrate fauna of the Yixian Formation
The invertebrate species listed below follow a survey by Chen and colleagues published in 2005, unless otherwise noted.[75]
Arachnids
The arachnid species listed below follow a catalogue compiled by Dunlop, Penney and Jekel in 2010, unless otherwise noted.[87]
Genus | Species | County | Member | Abundance | Notes | Images |
---|---|---|---|---|---|---|
A.? aethus |
||||||
A.? beipiaoensis |
||||||
A.? liaoxiensis |
||||||
A.? reheensis |
||||||
Cretaraneus |
C. liaoningensis |
|||||
G.? liaoningensis |
||||||
T.? atalus |
||||||
Beetles (Coleoptera)
Genus | Species | County | Member | Abundance | Notes | Images |
---|---|---|---|---|---|---|
Anoixis |
A. complanus |
A desmatin click beetle[88] |
||||
Apoclion |
A. antennatus |
Desmatin click beetles[88] | ||||
A. clavatus |
||||||
A. dolini |
||||||
Coptoclava |
C. longipoda |
A beetle[89] | ||||
Desmatinus |
D. cognatus |
A desmatin click beetle[88] | ||||
Fortiseode |
F. pervalimand |
An eodromeine trachypachid beetle[90] | ||||
G. orthochilus |
||||||
Hydrophilopsia |
H. gracilis |
Hydrophiloid water scavenger beetles[92] | ||||
H. hydraenoides |
||||||
H. shatrovskiyi |
||||||
Lasiosyne | L. integera | Huangbanjigou Village, Liaoning Province, northeastern China.[93] | A lasiosynid beetle.[93] | |||
L. parva | Huangbanjigou Village, Liaoning Province, northeastern China.[93] | A lasiosynid beetle.[93] | ||||
L. hongi |
||||||
M. gracilicruralis |
A mordellid beetle[95] | |||||
Oxyporus |
O. yixianus |
|||||
Paradesmatus |
P. dilatatus |
A desmati click beetle[88] | ||||
Parageotrupes |
P. incanus |
|||||
Sinocupes |
S. validus |
A beetle[89] | ||||
Sinosperchopsis |
S. silinae |
A hydrophiloid water scavenger beetle[92] | ||||
Sinoxytelus |
S. breviventer |
|||||
S. euglypheus |
||||||
S. longisetosus |
||||||
Crustaceans
Genus | Species | County | Member | Abundance | Notes | Images |
---|---|---|---|---|---|---|
Chenops[99] | C. oblongus | A notostracans |
![]() Chenops yixianensis ![]() Chenops oblongus (right) and Jeholops hongi (left) | |||
C. yixianensis | ||||||
Cricoidoscelosus | C. aethus | A crayfish[100] | ||||
Cypridea | C. (Cypridea) liaoningensis | Jianshangou Bed | Ostracods | |||
C. (C.) sihetunensis | Jianshangou Bed | |||||
C. (C.) veridica arguta | Jingangshan Bed | |||||
C. (C.) sp. | Jianshangou Bed | |||||
C. (Ulwellia) beipiaoensis | Beipiao | Jianshangou Bed | ||||
Damonella | D. formosa | Jianshangou Bed | An ostracod | |||
Darwinula | D. leguminella | Jianshangou Bed | An ostracod | |||
Diestheria | D. jeholensis | Jianshangou Bed | Clam shrimps | |||
D. yixianensis | Dawangzhangzi Bed | |||||
D.? sp. | Jianshangou Bed | |||||
Eosestheria | E. jingangshanensis | Jingangshan Bed | Clam shrimps | |||
E. lingyuanensis | Dawangzhangzi Bed | |||||
E. aff. middendorfii | Jingangshan Bed | |||||
E. ovata | Jianshangou Bed | |||||
E. sihetunensis | Jianshangou Bed | |||||
Eosestheriopsis | E. gujialingensis | Jianshangou Bed | A clam shrimp | |||
Jeholops[99] | J. hongi | A notostracan | ||||
Liaoningogriphus | L. quadripartitus | Jianshangou and Dawangzhangzi beds | A shrimp | |||
Lycopterocypris | L. infantilis | Jianshangou Bed | An ostracod | |||
Mantelliana | M. sp. | Jianshangou Bed | An ostracod | |||
"Mongolarachne" | "M." chaoyangensis | Dawangzhangzi Beds | A crayfish[101] | |||
Mongolianella | M. cf. palmosa | Jianshangou Bed | An ostracod | |||
Palaeocambarus | P. licenti | A crayfish[100] | ||||
Rhinocyrpis | R. jurassica | Jianshangou Bed | An ostracod | |||
Timiriasevia | T. jianshangouensis | Jianshangou Bed | An ostracod | |||
?Yanjiestheria | Y.? beipiaoensis | Beipiao | Jianshangou Bed | A clam shrimp | ||
Yanshania | Y. dabeigouensis | Jianshangou Bed | An ostracod | |||
Dragonflies (Odonata)
Color key
|
Notes Uncertain or tentative taxa are in small text; |
The dragonfly species listed below follow a review compiled by Zhang, Ren and Panf in 2008, unless otherwise noted.[102]
Genus | Species | County | Member | Abundance | Notes | Images |
---|---|---|---|---|---|---|
Abrohemeroscopus | A. mengi | A dragonfly | ||||
Aeschnidium | A. heishankowense | Reclassified as Sinaeschnidia heishankowense[103] | ||||
A. sp. | ||||||
Archaeogomphus | A. labius | Nymphs[103] | Reclassified as Yixiangomphus labius,[104] which is a junior synonym of Sinaeschnidia cancellosa[103] | |||
Bellabrunetia | B. catherinae | A dragonfly | ||||
Chrysogomphus | C. beipiaoensis | A dragonfly | ||||
Dissurus | D. liaoyuanensis[104] | Poorly preserved nymph[103] | Reclassified as Sinaeschnidia cf. cancellosa[103] | |||
Dracontaeschnidium | D. orientale | A dragonfly | ||||
Hebeiaeschnidia | H. fengningensis | A dragonfly | ||||
Huaxiagomphus | H. taushanensis | A dragonfly[104] | ||||
Liogomphus | L. yixianensis | A dragonfly | ||||
Mesocordulia |
M. boreala |
A corduliid dragonfly[94] | ||||
Palaeogomphus | P. labius | A dragonfly, reclassified as of Yixiangomphus labius,[104] which is a junior synonym of Sinaeschnidia cancellosa[103] | ||||
Parapetala | P. liaoningensis | A dragonfly | ||||
P. yixianensis | Jianshangou Unit[105] | |||||
Protoliupanshania | P. wangi | Jianshangou Unit[105] | A liupanshaniid dragonfly | |||
Pseudocymatophlebia | P. bisecta | Ningcheng County[106] | A well-preserved specimen.[106] | An aktassiid dragonfly | ||
Pseudoliupanshania | P. magnanicellula | Jianshangou Unit[105] | ||||
Pseudosamarura | P. largina[89] | One specimen, nymph[103] | Reclassified as Sinaeschnidia cf. cancellosa[103] | |||
Rudiaeschna | R. limnobia | An aeshnid dragonfly[94] | ||||
Sinaeschnidia | S. heishankowense | Jianshangou & Dawangzhangzi Beds | Adults and nymphs[103] | |||
S. cancellosa[103] | Junior synonym of S. heishankowense[107] | |||||
S. sp. | Indeterminate nymph specimens[103] | Some nymph specimens have been given their own genera and species though probably belong so S. heishankowense but too poorly preserved to be certain[103] | ||||
Sinogomphus | S. taoshanensis | A dragonfly | ||||
Sinojagoria | S. imperfecta | A dragonfly | ||||
Sopholibellula | S. amoena | Dragonflies | ||||
S. eleganti | ||||||
Stylaeschnidium | S. rarum | A dragonfly | ||||
Telmaeshna | T. paradoxica | Beipiao | A dragonfly | |||
Turanophlebia | T. liaoningensis | Beipiao[108] | Jianshangou Unit[108] | A tarsophlebiid dragonfly. | ||
Yixiangomphus | Y. labius | Nymphs[103] | Junior synonym of Sinaeschnidia cancellosa[103] |
Flies (Diptera)
Genus | Species | County | Member | Abundance | Notes | Images |
---|---|---|---|---|---|---|
Alleremonmus | A. xingi | Jianshangou Bed | A brachyceran fly | |||
Atalosciophila | A. yanensis | A mycetophilid gnat[109] | ||||
Chironomaptera | C. gregaria | A phantom midge | ||||
Gigantoberis | G. liaoningensis | A soldier fly[110] | ||||
Lichnoplecia | L. kovalevi | A protopleciid fly[111] | ||||
Palaepangonius | P. eupterus | A horse-fly[94] | ||||
Protapiocera | P. megista | An asiloid fly[94] | ||||
Protempis | P. minuta | A brachyceran fly[94] | ||||
Protonemestrius | P. jurassicus | A tangle-veined fly[94] | ||||
Wasps (Hymenoptera)
Genus | Species | County | Member | Abundance | Notes | Images |
---|---|---|---|---|---|---|
Abropelecinus | A. annulatus | Beipiao | An iscopinine pelecinid[112] | |||
Angaridyela | A. robusta | Jianshangou Bed | A sawfly | |||
Azygopelecinus | A. clavatus | Beipiao |
An iscopinine pelecinid[112] | |||
Chengdeserphus | C. petidatus | A proctotrupid wasp[94] | ||||
Cretevania | C. exquisita | Beipiao | Hatchet wasps[113] | |||
C. pristine | Jianshangou bed | |||||
C. vesca | ||||||
Liaotoma | L. linearis | A xyelotomid woodwasp[94] | ||||
Manlaya | M. flexuosus | An aulacid woodwasp[94] | ||||
Procretevania | P. exquisita |
Reclassified as Cretevania spp.[114] | ||||
P. pristine | ||||||
P. vesca | ||||||
Rudisiricius | R. belli |
Praesiricid sawflies[115] | ||||
R. celsus | ||||||
R. crassinodus | ||||||
Scolichneumon | S. rectivenius | An ichneumonoid wasp[94] | ||||
Sinopelecinus | S. viriosus | A pelecinid[112] | ||||
Tanychora | T. exquisita | Jianshangou Bed | An ichneumon wasp | |||
Other insects
Genus | Species | County | Member | Abundance | Notes | Images |
---|---|---|---|---|---|---|
Alloraphidia | A. bliquivenatica[89] | Snakeflies | ![]() Epicharmeropsis, a mayfly | |||
A. longistigmasa | Jianshangou Bed | |||||
Archeraphidia | A. shangyuanensis | A snakefly[89] | ||||
Baissopterus | B. liaoningensis | A snakefly[89] | ||||
Caenoephemera | C. shangyuanensis | Jianshangou Bed | A mayfly[89] | |||
Caloraphidia | C. glossophylla | A snakefly[94] | ||||
Choromyrmeleon | C. othneius | An antlion[94] | ||||
Circulaboilus | C. aureus | A grig[116] | ||||
Cretophasmomima | C. melanogramma | A stick insect[117] | ||||
?Ephemeropsis | ?E. trisetalis | Jianshangou and Jingangshan beds | A mayfly. Chinese specimens probably represent species of Epicharmeropsis[118] | |||
Epicharmeropsis | E. hexavenulosus[118] | Pingquan | Mayflies | |||
E. quadrivenulosus[118] | Beipiao | Jianshangou Bed | ||||
Hagiphasma | H. paradoxa | Jianshangou Bed | A stick insect | |||
Ilerdocossus | I. beipiaoensis | Cicadas[119] | ||||
I. exiguus | ||||||
I. fengningensis | ||||||
I. hui | ||||||
I. pingquanensis | ||||||
Kalligramma | K. liaoningensis | Jianshangou Bed | A lacewing | |||
Karatavoblatta | K. formosa | A cockroach[89] | ||||
Liaoaphidia | L. fornicata | A snakefly[89] | ||||
Liaonemobius | L. tanae | A sword-tail cricket[94] | ||||
Longicellochrysa | L. yixiana | A mesochrysopid lacewing[120] | ||||
Mesascalaphus | M. yangi | An owlfly[94] | ||||
Mesolygaeus | M. laiyangensis | A water bug[89] | ||||
Metabittacus | M. colosseus | Jianshangou Bed | ||||
Miracossus | M. ingentius | A cicada[119] | ||||
Nipponoblatta | N. acerba | Jianshangou Bed | A cockroach | |||
Oloberotha | O. sinica | A beaded lacewing[94] | ||||
Sinochresmoda | S. magnicornia | A chresmodid water-skiing insect[121] | ||||
Sinosharaperla | S. zhaoi | Beipiao | A stonefly[122] | |||
Sinoviparosiphum | S. lini | An aphid[94] | ||||
Sophogramma | S. lii | Jianshangou Bed | A lacewing[123] | |||
Tetraphelerus | T. laetus | A moth[89] | ||||
Varicapitatus | V. sinuolatus | "Huangbanjigou, Chaomidian Village, Beipiao City."[124] | A hemipteran. | |||
Unnamed Vitimotauliidae | Unnamed | A caddisfly pupa, likely belonging to the Vitimotauliidae.[125] | ||||
Unnamed Siphonaptera | Unnamed | A giant, non-jumping flea[126] | ||||
Molluscs
Genus | Species | County | Member | Abundance | Notes | Images |
---|---|---|---|---|---|---|
Amplovalvata | A. sp. | Jianshangou Bed | A gastropod | |||
Arguniella | A. lingyuanensis | Jianshangou Bed | A bivalve, also present in the Jiufotang and Fuxin Formations | |||
A. yanshanensis | Jianshangou Bed | A bivalve, also present in the Jiufotang Formation | ||||
Bithynia | B. haizhouensis | Jingangshan Bed | A gastropod | |||
Corbicula | C. anderssoni | Jianshangou Bed | Reclassified as Sphaerium anderssoni | |||
C. jeholense | Reclassified as Sphaerium jeholense | |||||
Gyraulus | G. sp. | Jianshangou Bed | A ramshorn snail | |||
Probaicalia | P. vitimensis | Jianshangou Bed | A gastropod | |||
Ptychastylus | P. harpaeformis | Jianshangou Bed | Gastropods | |||
P. cf. phillipi | Jianshangou Bed | |||||
Sphaerium | S. anderssoni | Jianshangou Bed | A fingernail clam, also present in the Jiufotang Formation | |||
S. jeholense | Junior synonym of S. anderssoni | |||||
S. selenginense | Junior synonym of S. anderssoni | |||||
?Viviparus | V.? cf. matsumotoi | Jingangshan Bed | A snail | |||
Flora of the Yixian Formation
Conifers
The coniferous trees and shrubs listed below were compiled in a survey by Wang and colleagues in 2006, unless otherwise noted.[127]
Genus | Species | County | Member | Abundance | Notes | Images |
---|---|---|---|---|---|---|
Brachyphyllum | A cypress-like conifer | |||||
Cephalotaxopsis | A yew | |||||
Cunninghamia | A cypress | |||||
Elatides | A cypress | |||||
Elatocladus | E. leptophyllus | Conifers of uncertain classification | ||||
E. manchurica[15] | ||||||
Liaoningocladus | L. boii | Jingangshan Bed | A conifer of uncertain classification | |||
Pagiophyllum | A cypress-like conifer | |||||
Pityocladus | A pine | |||||
Pityolepis | P. sp.[15] | A pine | ||||
Pityophyllum | P. cf. lindstroemi[15] | A pine | ||||
Pityostrobus | A pine | |||||
Podozamites | P. lanceolatus[15] | A conifer of uncertain classification | ||||
Schizolepis | S. jeholensis[15] | |||||
?Sequoia | S.? jeholensis[15] | |||||
Taxus | A yew | |||||
Torreya | A yew | |||||
Yanliaoia |
Y. sinensis[15] |
|||||
Ferns
Genus | Species | County | Member | Abundance | Notes | Images |
---|---|---|---|---|---|---|
Cladophlebis | C. spp.[15] | |||||
Coniopteris | C. sp.[15] | |||||
Onychiopsis | O. elongata[15] | Junior synonym of O. psilotoides | ||||
O. psilotoides[15] | ||||||
?Ruffordia | R.? sp.[15] | |||||
Flowering plants
Genus | Species | County | Member | Abundance | Notes | Images |
---|---|---|---|---|---|---|
Archaefructus | A. eoflora | Jianshangou Bed | A primitive, aquatic angiosperm | |||
A. liaoningensis | Jianshangou Bed | |||||
A. sinensisis | Dawangzhangzi Bed | |||||
Callianthus | C. dilae[128] | Liaoning | A plant with true flowers | |||
?Davallia | D.? niehhutzuensis[15] | |||||
Erenia | E. stenoptera[128] | Liaoning | Actually a specimen of Callianthus | |||
Leefructus | L. mirus[129] | A eudicot | ||||
Liaoxia | L. chenii[15] | |||||
?Potamogeton | P.? jeholensis[15] | |||||
Ranunculus | R. jeholensis[15] | Junior synonym of Potamogeton jeholensis | ||||
Sinocarpus | S. decussatus | A primitive eudicot | ||||
Ginkgos
Genus | Species | County | Member | Abundance | Notes | Images |
---|---|---|---|---|---|---|
Baiera | B. cf. gracilis[15] | |||||
B. orientalis[15] | ||||||
Czekanowskia | C. rigida[15] | |||||
Ginkgo | G. apodes[130] | |||||
Ginkgoites | G. sibiricus[15] | |||||
Leptostrobus | L. sp.[15] | |||||
?Nageiopsis | N.? sp.[15] | |||||
Phoenicopsis | P. cf. augustifolia[15] | |||||
Solenites | S. sp.[15] | |||||
Sphenobaiera | S. longifola[15] | |||||
Other plants
Genus | Species | County | Member | Abundance | Notes | Images |
---|---|---|---|---|---|---|
Chaoyangia | C. liangii[131] | A gnetale gymnosperm | ||||
Chaoyangicarpus | C. liangii[15] | Junior synonym of Chaoyangia liangii | ||||
Ephedra | E. sp. | A gymnosperm | ||||
Equisetum | E. sp. | A horsetail | ||||
Eragrosites | E. changii[131] | A grass-like gnetale gymnosperm | ||||
Siphonospermum | S. simplex[132] | Beipiao | Jianshangou Bed | A gnetale gymnosperm | ||
Tyrmia | T. sp.[15] | A cycad | ||||
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