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1.
早白垩世非洲叶?介科分子,在我国东北地区尚未发现过。本文记述了吉林梨树地区早白垩世营城组-登楼库组产出的非洲叶肢介科两个属Migransia和Zhestheropsis gen.nov。这些化石为中国北方以辽西热河群为代表和中国东南地区以浙西建德群为代表的,陆相晚期中生代地层的大致对比,提供了叶肢介化石的重要依据。此外,初步讨论了有关的非洲叶肢介科分子的演化和迁移。本文共描述了2属、4种,其中1新属、2新种。 相似文献
2.
中国白垩纪叶肢介生物地层学 总被引：3，自引：0，他引：3
叶肢介是一种淡水甲壳类动物,个体不大,一般在几毫米到两厘米之间,软体有点像虾,具有很多附肢,雌雄异体,外裹一对几丁质壳瓣,形似蚌壳,但不如后者的钙质壳那么厚实坚硬。叶肢介从泥盆纪开始出现,中生代时其演化中心从欧洲迁移到了东亚,白垩纪它们的分异和演化达到顶峰,到了新生代则进入衰亡阶段。叶肢介化石一般出现在陆相地层中,由于它数量多、演化快、分布广泛,近年来已成为中国和邻近地区中生代非海相生物地层划分和对比研究的重要手段之一。中国大陆白垩系主要是陆相沉积,按古地理和生物地理区系,早白垩世可以划分为西南湖群和东北、东南、西北两个大区,前者出现的是直线叶肢介(Orthestheria)动物群,后者则是东方叶肢介(Eosestheria)和延吉叶肢介(Yanjiestheria)动物群;晚白垩世在西南湖群出现的是华美叶肢介(Aglestheria)动物群,在东北松花湖水系出现的是真瘤模叶肢介(Euestherites)动物群,在华中和东南沿海云梦泽水系出现的是薄壳叶肢介(Tenuestheria)动物群。链叶肢介(Halysestheria)是联系它们相互对比的共同分子;晚白垩世早期的线叶肢介(Nemestheria)动物群则在上述3个区系都有分布,甚至在西北喀什地区的塞诺曼期海陆交互相沉积和美国德克萨斯州同期海相地层的陆相夹层中都有发现的记录,它是将中国陆相白垩系与国际海相标准划分联系起来的重要证据。关于中国白垩纪的叶肢介动物群和有关陆相地层的划分对比,产东方叶肢介的义县组以前放在上侏罗统顶部或做为侏罗系-白垩系过渡层处理,这次按全国地层表将东方叶肢介群归入早白垩世。 相似文献
3.
产于泰国半岛班关坤村附近的叶肢介化石原鉴定为 Pseudograpta cf.yuzhongensis Chen,P.jialingensisDuan,P.siamensis Duan,P.sp.,Paleoleptestheria chinensis Chen和 Palaeolmnadia?sp.等 5个属种或未定种 ,认为其时代为中侏罗世晚期。现经重新研究 ,发现这些叶肢介化石生长带上的网孔状装饰网壁相对较粗 ,网孔较深 ,孔径比 Euestheria ziliujingensis叶肢介群的分子要稍大一些 ,但远比 Pseudograpta或 N estoria叶肢介群的要小 ,基本上可以归入 Paleoleptestheria?chinensis叶肢介群 ,其生物地理区系属于古地中海水系 ,与中国西南湖群中侏罗世晚期的叶肢介动物群关系最为密切 ,其生存时代与北方地理区系的 Pseudograpta叶肢介动物群大致平行 相似文献
4.
银额盆地西部蒙额地1井二叠纪叶肢介的发现及其意义 总被引：1，自引：1，他引：0
近年来,银额盆地油气勘探不断取得新发现与突破,但对钻井地层划分及主要油气产层时代存在巨大争议,或认为产层为白垩系,或认为产层属二叠系。2017年实施的蒙额地1井钻井及取心工作,在930.5~958.0m井段的灰色、灰绿色粉砂质泥岩、泥岩层和1085.0~1095.5m井段的深灰色泥岩层中发现叶肢介化石。第一层段叶肢介为加氏圆通古斯卡叶肢介(比较种)Cyclotunguzites cf.gazimuri Novojilov,第二层段叶肢介为额济纳旗半圆李氏叶肢介(新种)Hemicycloleaia ejinaqiensis Niu(sp.nov.)和内蒙古点列叶肢介(新种)Polygrapta neimengguensis Niu(sp.nov.),均为晚二叠世代表性叶肢介。在此基础上,通过钻井地层对比,明确了银额盆地主要油气发现井的产层为二叠系。叶肢介具有重要的生物古地理指示意义,通过二叠纪叶肢介的区域分布与对比,结合银额盆地石炭纪—二叠纪地层层序分析,进一步限定了古亚洲洋的闭合时限为前石炭纪。 相似文献
5.
中国北方著名中、晚侏罗世的燕辽生物群含有丰富的叶肢介动物群。早期燕辽生物群也称为道虎沟生物群,主要产出层位为海房沟组,含有三饰叶肢介动物群,主要分子包括: 海房沟三饰叶肢介(Triglypta haifanggouensis )、滦平三饰叶肢介(T.luanpingensis )和平泉三饰叶肢介(T. pingquanensis )。晚期燕辽生物群又可称为玲珑塔生物群,主要产出层位为髫髻山组,含有丰富的叶肢介化石,主要分子包括: 建昌三饰叶肢介(Triglypta jiancangensis )、玲珑塔辽西叶肢介(Liaoxiestheria linglongtaensis )、大西山玲珑塔叶肢介(Linglongtaestheria daxishanensis )和青龙玲珑塔叶肢介(Linglongtaestheria qinglongensis )。文中总结了北方雕饰叶肢介(Aquilonoglypta )、柴达木叶肢介(Qaidamestheria )和针孔叶肢介(Punctatestheria )的最新研究成果,支持将柴达木叶肢介、辽西叶肢介和玲珑塔叶肢介划归北方雕饰叶肢介科。同时,三饰叶肢介是由针孔叶肢介演化而来,与柴达木叶肢介并无直接演化关系。 相似文献
6.
笔者于1985年鉴定一批采自滇中晚侏罗世妥甸组的叶肢介化石,在查阅文献中发觉原定的东方叶肢介(Eosestheria)已改名为似东方叶肢介(Eosestheriopsis)。为此,笔者认为有必要陈述滇中东方叶肢介群改名的经过,并讨论其合理与否。1.改名的经过1977年,陈丕基研究云南中生代红层专题研究队多年来采自滇中妥甸组的叶肢介化石,建立了一个晚侏罗世叶肢介动物群——滇中东方叶肢介(Eosestheria dianzhongensis)群。 相似文献
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8.
浙江平山膨润土含矿地层的时代对比——兼论中国东部中生代膨润土成矿区域划分问题 总被引：3，自引：0，他引：3
根据叶肢介化石群特征和区域地层对比,并结合以往孢粉、介形虫化石资料、同位素年龄测定,浙江平山膨润土含矿地层以划归寿昌组上段为宜,时代属早白垩世。中国东部环太平洋地区中生代膨润土含矿地层层位,自北西往南东由中侏罗统经上侏罗统、下白垩统至上白垩统递升。据此可大致划分出四个膨润土成矿区。 相似文献
9.
研究了首次发现于准噶尔盆地南缘头屯河剖面下侏罗统三工河组叶肢介化石的组合面貌,认为该组的叶肢介属于我国早侏罗世典型的Ｐａｌａｅｏｌｉｍｎａｄｉａｂａｉｔｉａｎｂａｅｎｓｉｓ叶肢介群,为研究这一时期叶肢介的生物地理区系提供了新的资料。 相似文献
10.
华亭—陇县地区志丹群含丰富的介形类化石,计9科、29属(亚属),206种(亚种)和16未定种。其中新亚属1个,新种(亚种)162个。依据介形类化石在剖面上的垂直演化规律划分出4个不同的介形类化石组合,并就各组合的特点、地层时代、生物地理区的意义以及与国内外有关的地层进行了深入的讨论,取得了一些新的认识和结论。这不仅是志丹群研究上的一次重要进展,而且对我国陆相早白垩世介形类动物群及其地层、古地理、生物区等问题的研究都具有重要的意义。 相似文献
11.
Chenyang Cai Diying Huang 《Proceedings of the Geologists' Association. Geologists' Association》2019,130(1):81-86
Cretoboganium gei gen. et sp. nov., a new amber inclusion of the cucujoid family Boganiidae is described and figured based on a well-preserved adult from the mid-Cretaceous Burmese amber (Hukawng Valley, northern Myanmar), some 99 million years ago. Based on the presence of a pair of pronotal callosities, Cretoboganium can be firmly placed in the extant subfamily Boganiinae, a small group currently comprising two small austral genera. Our discovery represents the first fossil record for Boganiinae. It also demonstrates another example that an apparently austral group may have its sister group occurred in today’s northern hemisphere. Together with the other fossil boganiid known from the Middle Jurassic of China, the finding suggests that Boganiidae is an ancient and relict group. Moreover, the present biogeographic distribution of Boganiinae is indicative of an earlier origin of this subfamily, which likely originated before the breakup of the Gondwanan supercontinent. 相似文献
12.
The Axymyiidae is one of the small families of the suborder Nematocera within the Diptera.Up to date,three genera and seven species of extant axymyiids have been described from the Holarctic Region,including Canada,China,Hungary,Japan,Russia,and USA,with three genera and three species of fossil taxa described from the Middle Jurassic of Daohugou,northeastern China.A new genus Raraxymyia gen.nov.and two new species,R.parallela and R.proxima gen.et sp.nov.from the Middle Jurassic Jiulongshan Formation of Daohugou Village,Inner Mongolia,China,are herein described based on their well-preserved wings and body characters.A revised key to the genera of axymyiids is provided. 相似文献
13.
Three New Stoneflies (Insecta: Plecoptera) from the Yixian Formation of Liaoning, China 总被引：1，自引：1，他引：0
Three new genera and species Archaeoperla rarissimus gen. et sp. nov. （Perlidae）, Liaotaenionema tenuitibia gen. et sp. nov. （Taeniopterygidae） and Parvinemoura parvus gen. et sp. nov. （？Nemouridae） are described and illustrated. All of them were collected from Yixian Formation of the western Liaoning, China. Hitherto, A. rarissimus is the oldest species possessing typical characters of Perlidae; the finding of L. tenuitibia indicates taeniopterygids once lived in the northeastern China in the late Mesozoic, but frequent volcanic activities, climate changes, or other environmental changes might have resulted in the disappearance of Taeniopterygidae in northern China after Mesozoic. Ancestral groups of Nemouridae have been abundant from Middle Jurassic, and male genitalia of P. parvus gen. et sp. nov. has been developed and similar to extant Nemouridae in the late Mesozoic. The stonefly fossils found from Yixian Formation are not divers at the species level, but rich at the family level. The diversity of stonefly implies different microclimate existed in the northeastern China at that time. A large old lacustrine basin existed in the western Liaoning, surrounded by hygrophilous plants on swampland and lake shore, warm and humid; tall arbor and boscage on the hillside nearby, mild and dry; mountains in the distance, rivulets running among the mountains, cool and wet. Many insects, prefer cool climate （e.g. stonefly, raphidiopterans, et ai.）, lived in the mountains with rivulets. 相似文献
14.
Liaostenophlebia yixianensis gen. et sp. nov., a new stenophlebiid damsel-dragonfly, is described from the Lower Cretaceous Yixian Formation of western Liaoning, northern China. It is the third Chinese damsel-dragonfly belonging to the family Stenophlebiidae to be described. Liaostenophlebia gen. nov. differs from the other genera of Stenophlebiidae in having Ax2 shifted just above MAb, a transverse and narrow Hal, a more curved anterior side of the hypertriangle, and a broader cubital-anal area. Sinostenophlebia zhanjiakouensis Hong, 1984 was previously attributed to Stenophlebiidae and hardly compares with other genera within this family. A check of the plates of the type species (Sinostenophlebia zhanjiakouensis Hong, 1984) suggests that Sinostenophlebia Hong, 1984 should be a member of the family Aeschnidiidae and it is very likely that this genus is a junior synonym of Leptaeschnidium Pritykina, 1977. The new data increases the diversity of both Stenophlebiidae and Aeschnidiidae in the Lower Cretaceous of China. 相似文献
15.
New Mesozoic Mesopsychidae(Mecoptera)from Northeastern China 总被引：2，自引：2，他引：0
<正>The Mesozoic family Mesopsychidae Tillyard,1917 presently consists of seven described genera and 13 species from the mid-Triassic to the Early Cretaceous of Australia,South Africa and Eurasia.In the present paper one new genus and three new species of fossil mesopsychids are described that add significant distributional and stratigraphic extensions to the family.This finding documents the first formal record of fossil Mesopsychidae in China.Both Lichnomesopsyche gloriae gen.et sp.nov.and L.daohugouensis gen.et sp.nov. were found from the Middle Jurassic Jiulongshan Formation of Inner Mongolia,whereas Vitimopsyche kozlovi sp. nov.,of mid Early Cretaceous age,was collected from the Jehol Biota of northern Hebei Province.This new,well-preserved material from China reveals complete and previously unknown body features,including head, antennae,mouthparts,legs and abdomen.The delicate and long proboscides of these new taxa indicate that they were feeding on externally exposed,nutrient-rich fluids of gymnospermous ovulate fructifications,and incapable of piercing surface epidermis-attributable principally to the absence of stylets.These proboscides originated, perhaps multiply,among basal Mecoptera and are functionally and structurally convergent with equivalent mouthparts borne by fossil and extant Diptera,Lepidoptera,Neuroptera and Coleoptera. 相似文献
16.
Two new genera from the Lower Cretaceous Yixian Formation of Beipiao City, Liaoning Province, northeastern China are described and illustrated. Paracretocateres gen. nov. (type species P. bellus, sp. nov.) and Yixianteres gen. nov. (type species Y. beipiaoensis sp. nov.) are assigned to the subfamily Lophocaterinae based on the state of the procoxae which are not projecting, the transverse procoxal cavities, and the exposed protochantins. The new taxa broaden the diversity of this family and provide further morphological characters for phylogenetic studies of Trogossitidae. They also provide evidence that lophocaterines well-diversified prior to the trogossitines and their biologies may have been similar to extant forms. 相似文献
17.
Two New Fossil Sawflies (Hymenoptera, Xyelidae, Xyelinae) from the Middle Jurassic of China 总被引：1，自引：1，他引：0
Two new genera with two new species of sawflies, Cathayxyela extensa gen. et sp. nov. and Aequixyela immensa gen. et sp. nov., from the Middle Jurassic Jiulongshan Formation of southeastern Inner Mongolia, China, are assigned to the subfamily Xyelinae （Hymenoptera, Xyelidae）. Cathayxyela gen. nov. can be distinguished by the third antennal article longer than the head; mesoprescutum and mesoscutellum nearly equal in length; the forewing with Sc meeting C before the junction of 1-M and 1- Rs; a weak and narrow pterostigma; and 3-Cu at least 1.5 times longer than the lm-cu. Aequixyela gen. nov. is characterized by the third antennal article nearly as long as the head; the forewing with Rs＋M approximately equal to 2-Rs in length; 2m-cu inclined toward the wing base and nearly reaching the middle of cell 3rm; lm-cu as long as the 2-Cu and 3-Cu; and the cell 2cua of regular hexagonal shape. 相似文献
18.
19.
A new genus and species of fossil elaterid namely Clavelater ningchengensis gen. et sp. nov. assigned to the subfamily Protagrypninae based on one specimen from the Middle Jurassic Jiulongshan Formation near Daohugou Village, Ningcheng County, Inner Mongolia, northeastern China is described and illustrated. This specimen displays a pair of large antennae that easily differs from those of most Mesozoic elaterids. There are around 36 species within 20 genera referred to elateroids described from the Early Jurassic to Miocene of China, with another three species within three genera reviewed, but the taxonomic assignment of at least seven species within three genera is doubted. The systematic position of fossil elateriform beetles reported from China is reviewed and the evolution of Mesozoic elateroids briefly discussed. 相似文献
20.
和凯里生物群一样,贵州寒武系杷榔动物群也含有丰富的棘皮动物始海百合化石,包括两个属种即俞氏贵州始海百合
GuizhoueocrinusyuiZhao,ParsleyetPeng,2007及殷氏原始球状始海百合(新属新种)Protogloboeocrinusyini(gen.etsp.
nov.).其中新属种是近期在杷榔组分布区南部贵州麻江下司淑里村杷榔组上部发现的,是凯里组中球形球状始海百合(GloboeocrinusglobolusZhao,
ParsleyetPeng,2008)的原始属种,两者均具有发育的吸盘、长的茎、近于球形或椭球形的萼及较长
的腕.但新属种茎呈倒长锥柱形,缝孔长卵形,腕枝数少,两者区别明显.Protogloboeocrinusyini(gen.etsp.nov.)的发现及研
究,不仅追溯到凯里组球形球状始海百合的原始属种,了解两者演化规律是茎变短,萼变球形,缝孔变为圆形,腕枝数量增加,
捕食能力增强.而且还增添了杷榔组始海百合的多样性及其分区性:杷榔组分布区北部仅见Guizhouocrinusyui,南部仅见
Protogloboeocrinusyini(gen.etsp.nov.) 相似文献