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1.
系统描述吉林南部早奥陶世珠角石类6科12属15种,其中包括2新属4新种和4未定种。详细讨论并明确了TunkuskocerasZhuravleva和Paratunkuskocerasgen.nov.,PararmenocerasShimizuetObata和ParormocerasShimizuetObata的特征及其相互区别。对珠角石类的隔壁颈类型做了新的划分,提出了6种类型10种形态的隔壁颈。根据体管内管道系统不同保存方式的分析研究,否认弧形(arched)管道的存在。 相似文献
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西藏南部普普嘎剖面托尔阶和阿连阶的菊石 总被引:1,自引:2,他引:1
西藏南部聂拉木县土隆村以北的普普嘎剖面产出丰富的下侏罗统菊石类化石。剖面上部的砂岩和灰岩中产出托尔阶和阿连阶的菊石,它们是Polyplectusdiscoides(Zieten),Grammo-cerasstriatulum(Sowerby),PhymatocerasrobustumHyatt,Bouleiceras?sp.,Dumortieria?sp.,Leiocerassp.,Cylicocerassp.。这些属种是在藏南首次发现的托尔阶和阿连阶的化石证据。 相似文献
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对产自吉林浑江大阳贫早奥陶世亮甲山组的大型粗壳内角石类进行系统进行,共描述2科3属37种和1个科属未定标本,其中1新属、3新种和2未定种。首次报道Piloceratidae科分子(Paracassinoceras dayangchaense gen.et sp.nov.)在东亚的首次发现。提出角石类内体管构造的4个类型。详细讨论Manchuroceras和Manchurceraidae科的地理分布 相似文献
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本文记述河南省伏牛山膜翅目小蜂总科小蜂科2新种:吉丁锥腹小蜂Trigonura chrysobathra sp.nov.,青冈梳角小蜂Chirocera glauca sp.nov。2新种所隶属的属均为中国新记录属。新种的模式标本存在中国林业科学研究院森林保护研究所标本室。 相似文献
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记述的鹦鹉螺主要产于太原组煤层顶板的深灰色砂质泥岩,少数产于石灰岩中,共4科7属14种。其中Tainoceratidae科和Grypoceratidae科标本颇为丰富,前一科属种较多,有3属9种。Pleuronatilus属曾见于我国北方甘肃、山西、河北等省的上石炭统(尹赞助,1933),而Tainoceras,Gzheloceras则为华北地区上石炭统首次发现;后一科除我国北方各省已报道的Domatoceras外,另建立1新属新种Feichengocerasfossalumgen.etsp.nov.。Trigonoceratidae科和Koninckioceratidae科在本区上石炭统各发现1属,即Aphelaceras和Foordiceras。从鲁西晚石炭世Foordiceras的发现,表明此属最早应始于晚石炭世,繁盛于二叠纪。晚石炭世本区海水时进时退,在滨海沼泽之后,随之而来的大面积海侵,由于陆缘浅海区阳光充足、盐度正常、藻类极度繁盛,为营游泳生活的鹦鹉螺和底栖生物提供了生存和繁衍的有利条件,故能在生物繁盛、沉积物堆积速度较快的情况下,保存大量完好的生物化石。 相似文献
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本文记述分布湖南省城步县的长柄茧蜂属Streblocera两新种,赵氏长柄茧蜂Streblocera chaoi You et Zhou,sp.nov.,何氏长柄茧蜂Strenlocera hei You et Xiao,sp.nov.,模式标本存于湖南农学院。 相似文献
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中国偏角飞虱属一新种:(同翅目:飞虱科) 总被引:2,自引:1,他引:1
本文记述采自陕西汉阴的偏角飞虱属Neobelocera1新种,即汉阴偏角飞虱Neobelocera hanyinensis,sp.nov.。模式标本保存于西北农业大学昆虫博物馆。 相似文献
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黑龙江东部龙爪沟群七虎林组菊石之修定 总被引:3,自引:1,他引:3
梁中发和王义刚分别于1982年和1983年记载了产自黑龙江东部龙爪沟群六虎林组的菊石化石。这些化石标本保存相当差,均为压模标本,当时鉴定计有ArctocephalitespeideensisLiang,CalliphyllocerasyunshanenseLiang,OxyceriesyunshanensisLiang,Lobokosmoceras?sp.和Stenocadocerassp.(梁中反,1982);Arctocpthalites(Cranocephalites)hulinensisWang,Stenocadoceras?sp.和Gen.etsp.indet(王义刚,1983)9种。尽管他们记述菊石的产出地层名称不一,属、种鉴定也不相同,但这些化石确系产自同一层位或相当的层位中,而且都定其产出的层位时代为中佛罗世Bathonian期。最近,经重新研究这些化石的原标本后,认为它们应归于Kennicottia,Kossmaticeras和Pseudohaploceras(或为silesitid)这几个类型。从这几个菊石类型的地质历程来看。 相似文献
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DESMOND T. DONOVAN 《Palaeontology》2006,49(3):673-684
Abstract: Phragmoteuthida from the Lower Jurassic (Upper Sinemurian) of Dorset, England, are fully described for the first time. Two species are recognized and described: Phragmoteuthis montefiorei (J. Buckman) and P. huxleyi sp. nov. Phragmocones have an apical angle of between 20 and 30 degrees, and relatively few chambers compared with belemnoids. The conotheca is multi-layered. The siphuncle is thick-walled. The pro-ostracum is long and three-lobed as in the Triassic species. Arms are short and bear pairs of slightly curved hooks. Shell and siphuncle structure do not indicate a close relationship with other coleoids. 相似文献
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Although the Early Palaeozoic cephalopod order Endocerida is generally regarded as monophyletic, alternative views have been expressed. These invoke origins from different lineages within the order Ellesmerocerida. To test these alternatives, various aspects of endocerid morphology (including conch shape, structure of the ectosiphuncle, form of the endosiphuncular deposits, nature of the apical portion of the conch, and distribution of muscle attachment scars) are reviewed and compared with those of potentially related ellesmerocerids, taking regard of their stratigraphical distribution. The taxonomic distribution of endocones and endocone-like structures, combined with the potential for endosiphuncular diaphragms to evolve into endocones, suggests that the presence of endocones cannot be used to diagnose the Endocerida. Two distinct groups of Early Ordovician cephalopods that bear endocones may be recognised. One includes the longiconic Proterocameroceratidae possessing septal necks of variable length, conical and simple endocones, unflated apical portion of the siphuncle, and probable dorsomyarian muscle attachment scars. The second group includes the Piloceratidae, Manchuroceratidae and younger Allotrioceratidae and Najaceratidae. All are characterised by complex endosiphuncular deposits of endocones with conchiolin and calcareous crests, holochoanitic to macrochoanitic septal necks, and probable oncomyarian muscle attachment scars. The earliest pilocerids possess compressed cyrtochoanitic conchs. The coeval appearance of these groups and the similarity of each group to distinct ellesmerocerid taxa suggest that the Endocerida are polyphyletic, and a new order, the Bisonocerida is proposed for this second group. 相似文献
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YASUYUKI TSUJINO YASUNARI SHIGETA 《Lethaia: An International Journal of Palaeontology and Stratigraphy》2012,45(3):443-449
Tsujino, Y & Shigeta, Y. 2012: Biological response to experimental damage of the phragmocone and siphuncle in Nautilus pompilius Linnaeus. Lethaia, Vol. 45, pp. 443–449. Three adult specimens of Nautilus pomplilius Linnaeus from the Philippines were experimented on to estimate the biological response to damage of the phragmocone and siphuncle in this cephalopod mollusc. In addition, the data obtained from the experiments were used for discussion of shell damage in ammonoids and in other extinct cephalopods. Specimen’s phragmocone and siphuncle were perforated and severed artificially, followed by observations in the laboratory tank during periods of 75 and 132 days. For at least 2 or 3 months, all individuals survived after damage to the phragmocone and siphuncle despite loss of neutral buoyancy. Based on our observations after completion of the experiments, the severed adoral remaining part of siphuncle healed by the siphunclar epithelium. In addition, perforation of the phragmocone was partly repaired by shell secretion from the dorsally extending mantle due to subsequent volution of shell growth. Our experiments revealed that damage to the phragmocone and siphuncle in Nautilus was not necessarily a lethal injury. It may be possible that such biological response also applies to extinct ammonoids and nautiloids. In a similar case of extinct ammonoids and nautiloids, damage to their phragmocone and siphuncle may also not have been a lethal injury as with Nautilus. However, some factors leading to death are likely to be dependent on the degree of damage to the phragmocone and siphuncle and influence of hydraulic pressure. □Ammonoids, injury, nautiloids, Nautilus, phragmocone, repair, siphuncle. 相似文献
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G. V. Zakharenko 《Paleontological Journal》2007,41(6):642-655
A new genus and species of pachyosteomorph arthrodire, Omalosteus krutoensis gen. et sp. nov. from shallow-water marine deposits of the Evlanovo Regional Stage (Upper Frasnian, Upper Devonian) of the Central Devonian Field is described. It is tentatively referred to the family Trematosteidae Gross, 1932, which was earlier believed to be endemic to central Europe. The new genus is characterized by a rounded, dorsoventrally compressed cross section of the pectoral region and smooth head shield and postcranial membrane bones. The centrale is elongated, forming a narrow lateral lobe. The praeorbitale, postorbitale, and centrale come in contact in the center of the orbital region. The mediodorsale is wide, its carinal process projects considerably posteriorly. The anterior margin of the anterior ventrolaterale lacks articular facets for the interlaterale. 相似文献
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中泥盆世盔甲鱼类在中国的首次发现 总被引:1,自引:2,他引:1
<正> 盔甲鱼类(galeaspids)为东亚区志留纪及泥盆纪分布很广的无颌类化石,但迄今为止,中泥盆世的盔甲鱼类还无确切记载。本文记述的盔甲鱼类不完整头甲,为广西区域地质调查队罗璋同志1975年所采,代表一新属种——近中显眶鱼Clarorbis apponomedianus gen. et sp. nov.,化石产于广西博白县三滩乡下六司一带的中泥盆世灰白色薄层至中厚层粉砂质泥岩中。1979及1987年,我们曾两次赴化石产地,仅获得一些盔甲鱼类碎片,同 相似文献
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Abstract: Three new genera including four new species of the bivalve family Mysidiellidae are described from late middle to early late Anisian (Middle Triassic) deposits of Qingyan, Guizhou Province, south-west China. The new taxa Leidapoconcha gigantea gen. et sp. nov., Waijiaoella elegans gen. et sp. nov., Waijiaoella speciosa gen. et sp. nov. and Qingyaniola mirabilis gen. et sp. nov. significantly increase the known taxonomic diversity within the Mysidiellidae. These findings suggest a somewhat endemic evolutionary development within this small bivalve family during the Middle Triassic in south-west China. 相似文献
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ZOSTEROGRAMMIDA, A NEW ORDER OF MILLIPEDES FROM THE MIDDLE SILURIAN OF SCOTLAND AND THE UPPER CARBONIFEROUS OF EURAMERICA 总被引:1,自引:0,他引:1
HEATHER M. WILSON 《Palaeontology》2005,48(5):1101-1110
Abstract: New Palaeozoic millipedes, Zosterogrammus stichostethus gen. et sp. nov. and Casiogrammus ichthyeros gen. and sp. nov., are described from the Francis Creek Shale Member of the Carbondale Formation (Upper Carboniferous: Pennsylvanian), Mazon Creek, Illinois, and the Hagshaw Hills Inlier (Middle Silurian: Wenlock) of the Midland Valley of Scotland, respectively. These millipedes, together with Purkynia lata Fritsch from the Upper Carboniferous (Westphalian D) of Nýřany, Czech Republic, are placed in the new family Zosterogrammidae within the new order Zosterogrammida. All of these millipedes have very broad terga with a microsculpture consisting of fine transverse terrace lines along the anterior of the terga and oblique terrace lines across the remainder. Zosterogrammida have a trunk-ring architecture consisting of an arched diplotergite, a pair of free ventral diplopleurites and a pair of free ventral sternites, indicating a relatively basal phylogenetic position within Chilognatha. Although the exact phylogenetic position is indeterminate, Zosterogrammus stichostethus has divided sternites, indicating a possible affinity with the Pentazonia. The Hagshaw Hills millipede contributes significantly to the high-rank diversity of Middle Silurian millipedes as all previously described taxa of this age belong to the Archipolypoda. 相似文献
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本文描述蜻蜒化石3新属,3新种:Rudiaeschna limnobia gen. et sp. nov. (Aeshnidae)、Liogomphus yixianensis gen. et sp. nov. (Gomphidae)、Mesocordulia boreala gen. et sp. nov. (Corduliidae)。所有模式标本均采自辽宁北票晚侏罗世地层中,现保存在中国地质博物馆。 相似文献
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云南禄丰晚中新世古猿产地的鸟类化石,共计3目、3科、6属、6种,包括2新属4新种。另外尚有科、目未定之一特殊鸟类标本。 相似文献
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云南早泥盆世多鳃鱼类的新发现 总被引:8,自引:7,他引:1
本文记述1976年在云南东部新发现的多鳃鱼类化石,计一新科、二新属、三新种。并进一步探讨了前中背孔、松果区、骨甲等的功能和特征。 相似文献