共查询到20条相似文献，搜索用时 15 毫秒
1.
Xiangdong Zhao Xianye Zhao Lei Chen Qi Zhang Bo Wang 《Proceedings of the Geologists' Association. Geologists' Association》2019,130(6):691-695
The Eomeropidae is a species-poor family with only 11 known fossil species from the Early Jurassic to Palaeogene. A new species of fossil eomeropid, Tsuchingothauma gongi sp. nov., is described based on a well-preserved wing from the Middle Jurassic Daohugou deposits of Inner Mongolia, China. Our new species is distinguished from the type species T. shihi mainly in having very numerous crossveins and cells; more longitudinal veins: 13 and 11 terminal branches in radial sector and medial field, CuA with 3 terminal branches and A with 7 terminal branches. 相似文献
2.
The byrrhid subfamily Lidryopinae subfam. nov. is proposed for Lidryops occultus gen. et sp. nov. described from Lower Cretaceous “opaque” amber originated from Archingeay-Les Nouillers, Charente-Maritime, southwest France which was studied using propagation phase contrast X-ray synchrotron microtomography at the European Synchrotron Radiation Facility (Grenoble). This byrrhid subfamily differs from members of the closely related groups (Chelonariidae, Limnichidae, Dryopidae, Elmidae, Lutrochidae) in the set of characters including the moderately convex dorsum, the subpectinate antennae, the five-segmented tarsi with strongly lobed tarsomeres 1–4, subsecuriform ultimate maxillary and labial palpomeres. An assumption on probable lifestyle of Lidryops occultus gen. et sp. nov. is proposed on the basis of structural peculiarities. A short review of the byrrhid fossil record and its analysis are made. 相似文献
3.
Two new Early Cretaceous fossil rove beetle species, Paleosiagonium brevelytratum n. gen. n. sp. and Paleosiagonium adaequatum n. gen. n. sp. are described from the Lower Cretaceous Yixian Formation of Liaoning Province, China. They are clearly placed in the extant Piestinae according to the following characters: body elongate and flat; anterior coxae small and globose; abdomen long and parallel-sided, with six visible sterna and one pair of paratergites on segments III–VII. This is the first report on the occurrence of the coleopteran subfamily Piestinae in the fossil record. The new discoveries indicate that Piestinae have originated at least by the Early Cretaceous, at about 125–120 Ma. 相似文献
4.
Chrysoraphidia relicta gen. et sp. nov. is described from the Early Cretaceous (Barremian) of the Yixian Formation, Liaoning Province, China. Its venation is characterized by a mixture of character states that occur mainly in the Neuroptera and Raphidioptera. The assignment of Chrysoraphidia gen. nov. to Raphidioptera is supported by the presence of its distinct pterostigma and the configuration of the wing vein ‘subcosta anterior’. It is interpreted as the first record of a group of basal snakeflies (Priscaenigmatomorpha) from the Cretaceous of Asia, hitherto known only from the Early Jurassic of Europe. 相似文献
5.
Diverse new material of mantises found in the Cretaceous amber-bearing deposits from Lebanon (Barremian), Spain (Albian), and Myanmar (Albian–Cenomanian) are described and figured. The Lebanese and Spanish forms are nymphs; while the one from Myanmar is an adult specimen. The Lebanese nymph corresponds to a new specimen of Burmantis lebanensis Grimaldi, 2003 while the adult Burmese (Myanmar) specimen belongs to the new species Burmantis zherikhini. The Spanish specimen represents a new genus and species and is established as Aragonimantis aenigma, but is considered family incertae sedis. The Spanish specimen is the first record of Mesozoic mantises from western-European amber deposits. A revised phylogenetic hypothesis for Cretaceous mantises is proposed. 相似文献
6.
We describe two new species of extinct biting midges in the fossil genus Protoculicoides: Protoculicoides hispanicus Szadziewski and Arillo, sp. nov. and Protoculicodes sanjusti Szadziewski and Arillo, sp. nov., from Albian (101–113 Ma) amber of San Just, Spain. Atriculicoides Remm, 1976 is recognized as a new junior synonym of Protoculicoides Boesel, 1937 (NEW SYNONYM). Devalquia Choufani et al., 2013 is regarded here as a new junior synonym of the extant genus Culicoides Latreille, 1809 (NEW SYNONYM). Metahelea roggeroi Choufani et al., 2013 from Upper Cretaceous French amber, is excluded from the tribe Heteromyiini and placed in the extant genus Stilobezzia Kieffer, 1911, tribe Ceratopogonini: Stilobezzia roggeroi (Choufani et al., 2013), comb. nov. The extinct tribe Atriculicoidini Szadziewski, 1996 is regarded as a new subfamily, Atriculicoidinae, stat. nov., that includes the fossil genus Protoculicoides, with 13 species reported from Albian, Turonian, Cenomanian, Coniacian, Santonian and Campanian ambers (78–113 Ma). Protoculicoides skalskii Szadziewski & Arillo, 1998 from Lower Cretaceous amber of Álava, Spain, Protoculicoides succineus Szadziewski, 1966 from Lower Cretaceous Lebanese amber and Protoculicoides burmiticus Szadziewski & Poinar, 2005 from Upper Cretaceous Burmese amber are transferred to the extinct genus Archiculicoides Szadziewski, 1996, comb. nov. Protoculicoides krzeminskii Choufani et al., 2014 from Lower Cretaceous Lebanese amber is transferred to the extinct genus Archiaustroconops Szadziewski, 1996, comb. nov. The Cretaceous subfamily Atriculicoidinae forms an unresolved trichotomy with the extant subfamilies Forcipomyiinae and Dasyheleinae, both of which date to the Eocene. The fossil record indicates that wings with macrotrichia in biting midges evolved during the mid-Cretaceous greenhouse climate. We suggest that this was an evolutionary adaptation to new atmospheric conditions with higher levels of CO2 in order for the antennal Johnston's organs of males to receive the vibrational sex signals produced by females during flight. 相似文献
7.
Oxyporinae is a distinct staphylinid subfamily characterized by a large body, remarkably long and projecting mandibles, and large, crescent-shaped terminal labial palpomeres. Previously, only three compression fossils from the Lower Cretaceous Yixian Formation in China were known for the subfamily from the Mesozoic Era. This study describes a remarkable new species, Oxyporus cretaceous sp. nov., based on a single specimen in Upper Cretaceous Burmese amber. This finding is the earliest record of Oxyporinae preserved as amber inclusion. The well preserved mouthparts suggest that mycophagous feeding habits had already been acquired by the mid-Cretaceous. 相似文献
8.
The first definitive fossil of the peculiar monotypic rove beetle subfamily Megalopsidiinae is described as a new species Megalopinus extinctus sp. n. It represents a stem lineage valuable for the study of the early diversification of Staphylinidae, where sister group relationships of Megalopsidiinae currently remain a big controversy. This discovery corroborates the Mesozoic origin of this subfamily implied by its presumably basal phylogenetic position within Staphylinidae and hitherto available fossil record for the family. Well preserved peculiar mouthparts of M. extinctus specialized similarly with recent Megalopinus suggest the same mode of feeding in Megalopsidiinae for nearly a hundred million years. 相似文献
9.
The Glandulariini (=Cyrtoscydmini) includes about 60 genera comprising over 70% of the extant species of Scydmaeninae. This successful group is today very common and abundant in forests of all continents. However, while extinct representatives of much smaller extant tribes, as Clidicini, Eutheiini and Cephenniini, were described from Cretaceous deposits, named genera and species of Glandulariini were so far known only from much younger Baltic, Sicilian and Dominican ambers. Here we report the first genus and species of definite Glandulariini from the Upper Cretaceous Burmese amber, Scydmobisetia vetutissima Jałoszyński and Yamamoto, gen. and sp. nov. Scydmobisetia is the first known glandulariine beetle with a pair of very long vertexal sensilla chaetica, previously not found in this tribe, but common among unrelated Staphylinidae. The new genus shows similarities to the extant genera Anthicimimus, Sciacharis, Spinosciacharis and Horaeomorphus, but S. vetutissima has protibial modifications typical of males of some extant species of Euconnus. We discuss the apparent disproportion in the oldest fossil record of various tribes of scydmaenines as a result of identification problems, and not the lack of known fossils. 相似文献
10.
Saskia Erdmann Rucheng Wang Fangfang Huang Bruno Scaillet Kai Zhao Hongsheng Liu Yan Chen Michel Faure 《Comptes Rendus Geoscience》2019,351(8):551-561
Constraining crystallization pressure and thus intrusion depth of granites in various geodynamic settings remains challenging, yet important to further our understanding of magma system and crustal evolution. We propose that titanite, which is a common accessory in metaluminous and weakly peraluminous granites, can be used as a barometer if it crystallized in magmatic, near-solidus conditions and in equilibrium with amphibole, plagioclase, K-feldspar, quartz, biotite, and magnetite ± ilmenite. Titanite Al2O3 increases with pressure (P) according to: P (in MPa) = 101.66 × Al2O3 in titanite (in wt%) + 59.013 (R2 = 0.83) with estimated uncertainties of ~±60 to ~±100 MPa for crystallization between ~150 and 400 MPa. We highlight that the current calibration dataset is limited, and that systematic experimental studies are needed to rigorously quantify the relation. The most important use of this empirical barometer will be for rocks in which amphibole is present but significantly altered, or in combination with amphibole barometry, as titanite can be easily dated by LA-ICP-MS. 相似文献
11.
The cymatoceratid nautilid genus Anglonautilus is distinguished from most other post-Triassic nautiloids by the occurrence of pronounced fold-like undulating ribs on the phragmocone and early body chamber. Anglonautilus praeundulatus n. sp. is described from the lower Aptian of eastern Spain. It is the first record of this genus from Spain and constitutes the oldest definite representative of the genus. This places the new species at the base of the evolutionary history of Anglonautilus. Its ornamental features confirm the previously assumed close relationship between Anglonautilus and Cymatoceras. An analysis of the ornamental pattern of all species hitherto referred to Anglonautilus indicates that there is an evolutionary lineage leading to the type species of the genus, A. undulatus, and a single successor (A. subalbensis). Several Late Cretaceous species hitherto identified as Anglonautilus (A. japonicus, A. mamiyai, A. suciensis) bear fold-like ribs superficially similar to typical representatives of Anglonautilus. The pattern of ornament in these taxa is very different at closer inspection, though. This suggests that these species developed independently from Cymatoceras. The undulations present in these taxa are interpreted here as a result of convergent evolution. They are therefore excluded from the genus Anglonautilus and provisionally referred to as “Anglonautilus” spp. 相似文献
12.
A new species, Eoptychoptera cantabrica sp. nov. is described from the Albian El Soplao amber-bearing deposits based on a single male with an elongated proboscis, unknown among extant members of Ptychopteridae. It represents the youngest record of the species-diverse genus Eoptychoptera. A pupa of Eoptychoptera sp. with a long respiratory horn, typical of extant ptychopterids, is described from Las Hoyas limestones, where adult fossil ptychopterids have yet to be discovered. A key to species of Eoptychoptera, based on wing venation, and a distribution map of Cretaceous Ptychopteridae are provided. The climatic preferences and mouthparts of Mesozoic and recent Ptychopteridae are discussed. 相似文献
13.
R. Scott Anderson Renata B. Jass Jaime L. Toney Craig D. Allen Marcey Hess Julianna Fessenden 《Quaternary Research》2008,69(2):263-275
Chihuahueños Bog (2925 m) in the Jemez Mountains of northern New Mexico contains one of the few records of late-glacial and postglacial development of the mixed conifer forest in southwestern North America. The Chihuahueños Bog record extends to over 15,000 cal yr BP. An Artemisia steppe, then an open Picea woodland grew around a small pond until ca. 11,700 cal yr BP when Pinus ponderosa became established. C/N ratios, δ13C and δ15N values indicate both terrestrial and aquatic organic matter was incorporated into the sediment. Higher percentages of aquatic algae and elevated C/N ratios indicate higher lake levels at the opening of the Holocene, but a wetland developed subsequently as climate warmed. From ca. 8500 to 6400 cal yr BP the pond desiccated in what must have been the driest period of the Holocene there. C/N ratios declined to their lowest Holocene levels, indicating intense decomposition in the sediment. Wetter conditions returned after 6400 cal yr BP, with conversion of the site to a sedge bog as groundwater levels rose. Higher charcoal influx rates after 6400 cal yr BP probably result from greater biomass production rates. Only minor shifts in the overstory species occurred during the Holocene, suggesting that mixed conifer forest dominated throughout the record. 相似文献
14.
15.
Lithostratigraphic and palynological analysis of two cores recovered from the ‘Grand Lac’ (New Caledonia), combined with 35 14C AMS dates, yields a paleoenvironmental record spanning the last 2000 yr. The lithology is represented mainly by clayey or laminated layers. A catastrophic event, which is marked by very coarse deposits, occurred probably between ca 1070-960 cal yr B.P. and possibly is associated with an unusually severe La Niña event. Before and after this event, a similar combination of the two main sediment types is recorded. The repeated alternation of laminated and clayey layers is interpreted as the response to local hydrologic forcing, which may reflect a shift from relatively wet to relatively drier conditions, respectively. Variable amount of micro-charcoal is detected all along the profile. Without additional evidence, notwithstanding the initial local human settlement documented since ca 2900 14C yr B.P., micro-charcoal occurrence and variability cannot be linked directly to an anthropogenic origin. No distinct palynological zonations in relation to the lithology are observed, and the vegetation changes may only represent minor transitions across environmental limits. 相似文献
16.
The taxonomic status of previously misplaced species of an ant-like stone beetle from Spanish amber (Albian) is clarified. Specimens of Kachinus magnificus (originally placed as incertae sedis within Scydmaenitae) were re-examined and their characters were found different from those of the type species of Kachinus from Myanmar amber. Consequently, Archeutheia gen. nov. is proposed to accommodate the Spanish species, resulting in Archeutheia magnifica comb. nov. Moreover, in a comprehensive phylogenetic analysis Archeutheia was placed as a sister group to extant Eutheia, within the tribe Eutheiini of Cephenniitae. A specimen of an undetermined genus from Myanmar amber clearly belonging in Cephenniini is also recorded. Both taxa represent the first definite Cretaceous Cephenniitae, a supertribe whose recent members are distributed on all continents but are especially diverse in the Oriental and East Palaearctic regions. This finding demonstrates a diversification of two presently most species-rich tribes of Cephenniitae already in Early Cretaceous. Archeutheia is strikingly similar to the extant species of Eutheia and Veraphis, showing male dimorphic characters (modified protrochanters) and antennal cavities characteristic of Palaearctic Eutheiini. This fact suggests a long morphological stability in the supertribe. A previously proposed hypothesis of an early presence of the Cephenniitae in the Northern Hemisphere is for the first time supported by the fossil record, and the palaeolocalities (western Europe and Southeast Asia) demonstrate a wide distribution of Cephenniitae in the Cretaceous and an early split of its ancestral lineage. 相似文献
17.
Ptisma zasukhae gen et sp. nov. is described from the Lower Cretaceous Lebanese amber and attributed to a new family Ptismidae fam. nov. with unclear position within the infraorder Staphylinoformia, hypothetically in the superfamily Staphylinoidea. This species is characterized by the rather small body size (0.59 mm) and structural similarities with different staphylinoid groups. The particular development of the legs of the new taxa shows some similarities with those of small and medium-sized jumping beetles from the superfamilies Scirtoidea, Buprestoidea, Tenebrionoidea, Chrysomeloidea and Curculionoidea. However, jumping beetles of these groups have strong femora and tibiae with large spurs and thick apical setae only on the posterior legs while P. zasukhae sp. nov. demonstrates such features on both mid and posterior legs. Another particularity of P. zasukhae sp. nov. is the unusual large femoral plate of metacoxae extending behind the suture between ventrites 2 and 3. Strong development of these structures are rare among Coleoptera and occurs in different taxonomic groups without close relationship. The studies were carried out with the usage of usual conventional light microscopy and confocal laser scanning microscopy. 相似文献
18.
栖霞山铅锌矿位于长江中下游成矿带东部,是我国东部最大的铅锌矿床。通过矿区接替资源勘查,在深部取得重大突破,主矿体控制深度由-650 m延深至-1 079 m,且在深部发现了绿帘石、透闪石、透辉石等矽卡岩蚀变矿物。结合最新成果,从控矿地质因素、矿体地质、成矿元素的空间分带特征等入手,全面总结了矿床地质特征。通过分析黄铁矿、闪锌矿、方铅矿、黄铜矿中S同位素组成,发现黄铁矿中的硫来源于沉积岩和岩浆,而闪锌矿、方铅矿和黄铜矿中的硫来源于岩浆;硫化物中Pb同位素的分布特征指示矿石铅主要来源于上地壳与地幔混合;碳酸盐矿物C、O同位素组成反映成矿流体与岩浆热液的亲缘关系;H、O同位素特征反映成矿流体主要为深部岩浆期后热液,并有大气水的加入。综合地质与同位素地球化学研究成果,对栖霞山铅锌矿床的成因进行了探讨。 相似文献
19.