A new eucryptodiran turtle from the Early Cretaceous Jiufotang Formation of western Liaoning, China

Zootaxa ◽  
2010 ◽  
Vol 2676 (1) ◽  
pp. 45 ◽  
Author(s):  
CHANG-FU ZHOU
Keyword(s):  
Early Cretaceous ◽  
Cladistic Analysis ◽  
Yixian Formation ◽  
Liaoning Province ◽  
Jehol Biota ◽  
Western Liaoning ◽  
The Third

A new eucryptodiran turtle from the Jiufotang Formation of Lamadong, Jianchang County, represents the third turtle taxon, Liaochelys jianchangensis gen. et sp. nov., from the Jehol Biota of western Liaoning Province, China. This taxon is diagnosed by a character combination including a midline contact of the prefrontals, vertebrals wider than long, third costals strongly expanded distally, and a medial contact of the eighth costals. A preliminary cladistic analysis places Liaochelys jianchangensis along the phylogenetic stem of Cryptodira in a position more derived than the taxa, Manchurochelys manchoukuoensis and Ordosemys liaoxiensis, known from the underlying Yixian Formation. This discovery opens a new window into the osteology and evolution of primitive eucryptodiran turtles.

A second specimen of Manchurochelys manchoukuoensis Endo & Shikama, 1942 (Testudines: Eucryptodira) from the Early Cretaceous Yixian Formation of western Liaoning, China

Zootaxa ◽  
2010 ◽  
Vol 2534 (1) ◽  
pp. 57 ◽  
Author(s):  
CHANG-FU ZHOU
Keyword(s):  
World War Ii ◽  
Early Cretaceous ◽  
Cladistic Analysis ◽  
Yixian Formation ◽  
Liaoning Province ◽  
Cranial Morphology ◽  
Jehol Biota ◽  
Western Liaoning ◽  
Additional Information ◽  
Close Relationship

Within the Early Cretaceous Jehol Biota of China, the turtle Manchurochelys manchoukuoensis Endo & Shikama, 1942 was one of the first discovered tetrapod fossils, but no additional information on this enigmatic taxon has become available during the past half century since its discovery. Here, a new turtle skeleton from the Yixian Formation of western Liaoning Province is identified as referable to M. manchoukuoensis on the basis of an elongate oval shell, long and narrow second to fourth vertebral scutes, and two suprapygals, of which the second is much larger than the first. This specimen therefore represents the second specimen of M. manchoukuoensis, the holotype of which was probably lost during World War II. This discovery not only provides essential material that allows the validity of M. manchoukuoensis to be tested, but also substantially expands understanding of its bony anatomy, especially with regard to cranial morphology. Among other features, M. manchoukuoensis is characterized by a postorbital that does not contact the quadrate/squamosal and a deep temporal emargination, which support a close relationship with Sinemys spp. and distinguish it from the co-existing Ordosemys liaoxiensis. A cladistic analysis that includes M. manchoukuoensis further supports the hypothesis that Sinemydidae is a monophyletic group that includes Sinemys spp. and Dracochelys bicuspis.

scholarly journals A new wing skeleton of <i>Forfexopterus</i> (Pterosauria: Ctenochasmatidae) from the Early Cretaceous Jehol Biota reveals a developmental variation

Fossil Record ◽  
2020 ◽  
Vol 23 (2) ◽  
pp. 191-196
Author(s):  
Chang-Fu Zhou ◽  
Jiahao Wang ◽  
Ziheng Zhu
Keyword(s):  
Sexual Dimorphism ◽  
Early Cretaceous ◽  
Skeletal Maturity ◽  
Filter Feeding ◽  
Jehol Biota ◽  
Western Liaoning ◽  
Developmental Variation ◽  
The Third

Abstract. In the Jehol Biota, the filter-feeding ctenochasmatid pterosaurs flourished with a high biodiversity. Here, we report a new wing skeleton of the ctenochasmatid Forfexopterus from the Early Cretaceous Jiufotang Formation in Jianchang, western Liaoning, China. The specimen exhibits the sole autapomorphy, the first wing phalanx shorter than the second and longer than the third. Interestingly, it exhibits a skeletal maturity with co-ossified elements, but it is only about 75 % the size of the immature holotype. This discrepancy reveals developmental variation of Forfexopterus, but its relationship with sexual dimorphism needs to be certain by more available material.

The first skiff beetle (Coleoptera: Myxophaga: Hydroscaphidae) from Early Cretaceous Jehol Biota

2012 ◽  
Vol 86 (1) ◽  
pp. 116-119 ◽  
Author(s):  
Chenyang Cai ◽  
Andrew E. Z. Short ◽  
Diying Huang
Keyword(s):  
Early Cretaceous ◽  
Lower Cretaceous ◽  
Northeastern China ◽  
Yixian Formation ◽  
Liaoning Province ◽  
Single Specimen ◽  
Jehol Biota ◽  
Diagnostic Characters ◽  
Aquatic Beetles

The first skiff beetle fossil and earliest myxophagan,Hydroscapha jeholensisn. sp., is described and illustrated on the basis of a single specimen from the Lower Cretaceous Yixian Formation at Huangbanjigou of Beipiao City, Liaoning Province, Northeastern China. Based on the combination of diagnostic characters of this specimen (e.g., minute and fusiform body, short elytra, tapered abdomen, separated meso- and metacoxae, and 3-segmented tarsi), we suggest that it is a definitive representative of Hydroscaphidae belonging to the widespread hydroscaphid genusHydroscaphaLeConte, 1874. It also represents the only impression fossil of the beetle suborder Myxophaga. This find displays great significance for shedding light on the preservation of the minute aquatic beetles, since it is the first well-preserved impression fossil reported for the suborder, rather than amber inclusion.

scholarly journals New Bohaiornis-like bird from the Early Cretaceous of China: enantiornithine interrelationships and flight performance

PeerJ ◽  
2019 ◽  
Vol 7 ◽  
pp. e7846 ◽  
Author(s):  
Luis M. Chiappe ◽  
Meng Qingjin ◽  
Francisco Serrano ◽  
Trond Sigurdsen ◽  
Wang Min ◽  
...  
Keyword(s):  
Early Cretaceous ◽  
Shoulder Girdle ◽  
Yixian Formation ◽  
Northwestern China ◽  
Liaoning Province ◽  
New Taxon ◽  
Flight Performance ◽  
Jehol Biota ◽  
Phylogenetic Framework

During the last decade, several Bohaiornis-like enantiornithine species—and numerous specimens—have been recognized from the celebrated Jehol Biota of northwestern China. In this paper, we describe the anatomy of another “bohaiornithid” species from the 125 million-year-old Yixian Formation of Liaoning Province, China. The new taxon differs from previously recognized “bohaiornithids” on a number of characters from the forelimb and shoulder girdle. We also provide a new phylogenetic framework for enantiornithine birds, which questions the monophyly of the previously recognized bohaiornithid clade and highlights ongoing challenges for resolving enantiornithine interrelationships. Additionally, we offer the first assessment of the flight properties of Bohaiornis-like enantiornithines. Our results indicate that while “bohaiornithids” were morphologically suited for flying through continuous flapping, they would have been unable to sustain prolonged flights. Such findings expand the flight strategies previously known for enantiornithines and other early birds.

New Material of Zhenyuanopterus (Pterosauria) from the Early Cretaceous Yixian Formation of Western Liaoning

2014 ◽  
Vol 88 (1) ◽  
pp. 1-5 ◽  
Author(s):  
Fangfang TENG ◽  
Junchang LÜ ◽  
Xuefang WEI ◽  
Yufu HSIAO ◽  
Michael PITTMAN
Keyword(s):  
Early Cretaceous ◽  
Yixian Formation ◽  
Western Liaoning ◽  
New Material

Varves in the Yixian Formation, western Liaoning: Constraining the palaeoclimate in the Early Cretaceous

2021 ◽  
Author(s):  
Tiehui Wang ◽  
Enpu Gong ◽  
Yue Liang ◽  
Ying Cui ◽  
Wentao Huang
Keyword(s):  
Early Cretaceous ◽  
Yixian Formation ◽  
Western Liaoning

A new genus of Scolebythidae (Hymenoptera: Chrysidoidea) from the Early Cretaceous of China

Zootaxa ◽  
2012 ◽  
Vol 3504 (1) ◽  
pp. 56 ◽  
Author(s):  
YAPING CAI ◽  
YUNYUN ZHAO ◽  
CHUNGKUN SHIH ◽  
DONG REN
Keyword(s):  
New Species ◽  
Early Cretaceous ◽  
Type Species ◽  
New Genus ◽  
Northeastern China ◽  
Yixian Formation ◽  
Liaoning Province ◽  
Comprehensive Understanding ◽  
The Family ◽  
Two New Species

A new genus Mirabythus Cai, Shih et Ren, gen. nov. (type species, M. lechrius Cai, Shih et Ren, sp. nov.) and M. liae Cai, Shih et Ren, sp. nov. from the family Scolebythidae are described from the Early Cretaceous Yixian Formation of Huangbanjigou Village, Liaoning Province, northeastern China. These findings extend the existence of Scolebythidae to the Early Cretaceous of China, while providing evidence to support Engel and Grimaldi’s hypothesis that the family was widely distributed throughout the Cretaceous. Our two new species with clear venation also provide a comprehensive understanding of the venational changes from the Early Cretaceous to now. A key to the fossil and extant genera of Scolebythidae is provided.

scholarly journals A new fossil mordellid (Coleoptera: Tenebrionoidea: Mordellidae) from the Yixian Formation of Western Liaoning Province, China

Zootaxa ◽  
2007 ◽  
Vol 1415 (1) ◽  
pp. 49-56 ◽  
Author(s):  
MING LIU ◽  
WENHUA LU ◽  
DONG REN
Keyword(s):  
New Species ◽  
Late Jurassic ◽  
New Genus ◽  
Hind Femur ◽  
Yixian Formation ◽  
Liaoning Province ◽  
New Genus And Species ◽  
Ne China ◽  
Western Liaoning ◽  
Fossil Specimen

A new genus and species, Mirimordella gracilicruralis gen. et sp. nov., in the subfamily Praemordellinae of Mordellidae, is described and illustrated based on a nearly complete fossil specimen. It is from the Yixian Formation of western Liaoning Province, NE China. The diagnosis of the subfamily Praemordellinae is emended based on this new species. Characters such as simple and linear maxillary palpi, simple claws, simple penultimate segments of fore and middle tarsi, small hind coxal plates, slender hind femora, only apical ridges on hind tibiae and tarsi, and no elongated last tergum suggest that Praemordellinae might be the precursor of modern mordellids. The resemblance between the new species and the Late Jurassic Praemordella martynovi indicates close relationships between them and with the tribe Stenaliini in the subfamily Mordellinae. The position of epicoxa and slender hind femur suggest that the new species may be more primitive than Praemordella martynovi and may indicate the age of the Yixian Formation no later than Late Jurassic.

Microbial–caddisfly bioherms in the Early Cretaceous Yixian Formation in the Yixian Basin, Western Liaoning, China

2017 ◽  
Vol 78 ◽  
pp. 127-138 ◽  
Author(s):  
Enpu Gong ◽  
Jiang Xu ◽  
Tiehui Wang ◽  
Yue Liang ◽  
Fei Gao
Keyword(s):  
Early Cretaceous ◽  
Yixian Formation ◽  
Western Liaoning

Geochemical Characteristics and Genesis for Volcanic Rocks of Yixian Formation in Western Liaoning Province

2014 ◽  
Vol 962-965 ◽  
pp. 282-285
Author(s):  
Yan Dong Peng ◽  
Chun Yun Yu ◽  
Xiong Fei Bian
Keyword(s):  
Volcanic Rocks ◽  
Yixian Formation ◽  
Liaoning Province ◽  
Calc Alkaline ◽  
Western Liaoning ◽  
Incompatible Elements ◽  
High K ◽  
The Right ◽  
Compatible Elements ◽  
Comprehensive Study

Volcanic rocks of Yixian Formation were widely distributed in western Liaoning. The Yixian volcanic cycle of early Cretaceous in the Chaoyang basin can be divided into two subcycles. The first subcycle is composed of basalt, basalt andesite and andesite. The second subcycle is composed of trachyandensite and trachyte. The volcanic rocks are characterized by high SiO2, Al2O3, K2O and Na2O, and comparatively low TiO2 components. The volcanic rocks are obviously enriched in incompatible elements, and depleted in compatible elements. The ∑REE of volcanic rocks is high and rich in LREE. The spider patterns are the right-incline, there is a slight low Eu negative abnormality and low Ce negative abnormality. The characteristics show that volcanic rocks of Yixian Formation belong to the high-K calc-alkaline magmatic serious. Comprehensive study shows that the volcanic rocks of Yixian Formation were generated in response to lithosphere extension in the continent intraplate orogenic belt.

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