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本文记述了采自山东平邑盆地卞桥组中段的介形类化石15属21种,其中1新属,10新种,并依据Sinodarwinula属建立Sinodarwinulidae新科。根据化石的分析对比,确认含化石地层的时代为始新世早期。介形类化石组合中发现Cypridea(Cypridea)pingyiensisGuansp.nov.,这是已知该属在我国出现的最高层位,为研究Cypridea的演化提供了重要的材料。 相似文献
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我国西南部地区早期中生代一些介形类化石 总被引:1,自引:0,他引:1
本文描述了介形类化石11属、31种,其中一新属、10新种及3未定种。除2属7种属于早、中侏罗统之外,其余皆属三叠系,尤以上三叠统最多,丰富了我国三叠纪的介形类化石资料。 相似文献
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介形类不仅是鱼类的天然饵料,还是监测水域环境污染的指示生物,尤为研究地层对比及沉积环境具有重要意义的化石介形类的参考材料。研究现今生活的介形类的生活环境,更可为深入研究化石介形类的古生态及古地理等,提供重要的科学依据。化石介形类的研究与我国地质学、古生物学和油、气田的勘察、钻探、开发都有密切关系。四川省的介形类Brehm(1923)只报道了一个亚种,陈受忠(1982)记述了6种。作者经过最近数年的采集调查,在收集到的标本中已鉴定出1科11属18种。(见表),其中普通泥介虫、棘列泥介虫、角突泥介虫、青春腺状介虫、半球腺状介虫、… 相似文献
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本文报道了陕西省南郑县梁山地区中奥陶统宝塔组介形类8属10种,其中包括3新属8新种。这些介形类化石的发现,为该时代地层的划分、对比增添了新的古生物依据。 相似文献
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湖南湘乡上泥盆统佘田桥组介形类 总被引:2,自引:1,他引:1
本文首次报道了湖南湘乡上泥盆统佘田桥组介形类化石,共有18属35种及未定种,其中包括11新种。通过与国内外泥盆纪和早石炭世介形类进行比较表明,它们与下伏的中泥盆统棋梓桥组介形类组合和上覆的上泥盆统锡矿山组介形类组合均有明显的差别,该介形类动物群的发现,为佘田桥组的地质时代的确定及地层的划分对比提供了新的古生物依据,并对研究介形类动物群的演化增加了新的资料。 相似文献
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本文首次报道了南京附近中三叠统中的海相介形类化石共4属7种,其中1新种Judahella longtanensis和2未定属种Gen.et sp.1及Gen.et sp.2;与介形类化石共生的还有海相瓣鳃类化石Myophoria(Costatoria)goldfussi mansuyi Hsü.此介形类动物群与贵州郎岱中三叠统关岭组的非常相似。 相似文献
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《微体古生物学报》2015,(2)
滴水湖作为人工新建湖泊,其生态系统形成过程中的跟踪数据对重建其他湖泊生态系统具有重要的参考意义。2013年7月和2014年8月对滴水湖现生介形类分布状况及水环境因子分别进行了调查,结果发现,滴水湖湖水盐度范围介于1.4‰—2.0‰之间,属于微咸水湖。12个采样点共鉴定出现生介形类13种,包括非海相类克氏丽星介Cypria kraepelini(G.W.Müller)和无偶斗星介Cypridopsis vidua(O.F.Müller),海相类中华洁面介Albileberis sinensis Hou、向岛薄丽星介Dolerocypria mukaishimensis Okubo、腹结细花介Leptocythere ventriclivosa Chen、东台新单角介Neomonoceratina dongtaiensis Yang et Chen、长新中华花介Neosinocythere elongata(Hu)、闪光似异口介Paradoxostoma nitida Ho、典型中华美花介Sinocytheridea impressa(Brady)、长中华海花介Sinopontocythere elongata(Gou)、古屋刺花介Spinileberis furuyaensis Ishizaki et Kato、美丽刺面介Spinileberis pulchra Chen和丰满陈氏介Tanella opima Chen。应用典范对应分析(CCA)方法对滴水湖12个样点的8种介形类和9个环境因子进行了相关性研究,结果显示:介形类和环境因子间具有明显的相关性;9个环境因子中叶绿素、总磷和电导率对介形类的分布影响最大,总氮和湖水水温对介形类也有一定影响;从物种分布状况看,相对于低分布频度物种,高分布频度(Y>0.01)物种对环境的耐受性更大,其中Cypria kraepelini和Neomonoceratina dongtaiensis对环境因子的敏感性明显高于其它物种。结合历史资料分析发现,不仅自然环境因子(如电导率、水温等),而且人为干扰因素(如总磷、总氮)都对介形类分布的改变起到重要影响。 相似文献
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Leandro T. Sabagh Roberto Júnio P. Dias Christina W. C. Branco Carlos F. D. Rocha 《Biodiversity and Conservation》2011,20(8):1837-1841
The bromeliad habitat contributes to a high biodiversity and we recorded three treefrog species as new phoretic agents of
ostracods, and a first case of hyperphoresy among treefrogs, ostracods and ciliates, in these habitats of Atlantic Forest.
Densities of ciliates and ostracods showed significant relationships suggesting the importance of hyperphoresy for ciliate
dispersion. 相似文献
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E. I. Schornikov 《Paleontological Journal》2017,51(5):510-519
Taxonomic revision of ostracods of the Pliocene–Pleistocene beds of the Caspian Basin from collections of the VNIGRI and analysis of published data on ostracods of the Ponto–Caspian Sea results in synonymization of 16 species names; one species is provided with a new combination, 40 identifications are improved, and 12 erroneous spellings of ostracod names by certain authors are revealed. 相似文献
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G. Hartmann 《Helgoland Marine Research》1991,45(1-2):165-198
The present paper deals with ostracods collected by H. Kunz during October and November 1979 on the Hawaiian Islands (Big
Island, Maui and Kauai). 26 species were found, nine species are described, two were already known to science, 15 remain in
open nomenclature. Although some of the new species are represented only by a single specimen, the morphologic characters
permit to distinguish them from other species of the genus. The ostracods of the Hawaiian Islands are very imperfectly known.
相似文献
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甘肃玉门下沟地区早白垩世下沟组介形类 总被引:3,自引:1,他引:2
甘肃玉门下沟地区下沟组介形类化石十分丰富,该地区下沟组介形类化石共计9属4亚属,21种,本文描述了其中4新种,即Cypridea(Cyamocypris)xiagouensissp.nov.,Cypridea(Cypridea)subunicostatasp.nov.,Stenestroemiasubpeculiarissp.nov.和Stenestroemiaxiagouensissp.nov.。该介形类化石组合尤以Cypridea最为繁盛,通过分析介形类属种的形态特征和化石组合特征并结合岩性特征,推断下沟组的地质时代为早白垩世巴列姆期;并认为下沟组为水动力较弱的淡水-微咸水河湖相沉积。 相似文献
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N. V. Aladin W. T. W. Potts 《Journal of comparative physiology. B, Biochemical, systemic, and environmental physiology》1996,166(3):215-222
All ostracods that inhabit inland waters are osmoregulators. Freshwater ostracods must be hyperosmotic regulators while ostracods that live in hyperhaline water are hypoosmotic regulators. Some euryhaline species are hypoosmotic regulators in salinities above 8 g·l-1 and hyperosmotic below. Hyperosmotic regulation in ostracods is partly dependent on salt consumed in the food but hypoosmotic regulation is dependent on the excretion of salt brought about by special cells located on the inside of the carapace. 相似文献
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L. M. Semenova 《Inland Water Biology》2014,7(1):10-14
A total of 15 species of ostracods of 7 genera and 3 families of the suborder Podocopa Sars have been recorded in rockpools of the Kandalaksha Bay in the White Sea. Among them, Potamocypris pallida Alm is a new species for the fauna of Russia. Data on species composition and the dominant complex and ecological features of ostracods which inhabit waters of rockpools are presented. 相似文献
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Ostracods collected from shallow coral reefs in the Bahamas were found to exhibit blue light-stimulated orange fluorescence at night. Fluorescent spectra revealed the presence of orange fluorescence with a maximum emission at ~595 nm on the carapace of these ostracods, while scanning electron microscopy revealed a morphologically diverse microbial community covering the entire carapace of these ostracods. Pyrosequencing and cyanobacterial-specific 16S rRNA sequencing reveals that this epibiont community is highly diverse and highly variable between individual ostracods. Many species of Cyanobacteria in the orders Oscillatoriales and Chroococcales, as well as other Proteobacteria and diatom chloroplast sequences, were identified using the cyanobacterial-specific primers. While no fluorescent proteins or phycoerythrin were detected in these ostracods, it is possible that the observed orange fluorescence is the result of carotenoid fluorescence from Cyanobacteria. The microbial consortium forms an epibiotic biofilm on the carapace of these ostracods whose functions are unknown. 相似文献
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Avi Eitam Leon Blaustein Kay Van Damme Henri J. Dumont Koen Martens 《Hydrobiologia》2004,525(1-3):125-130
We examined species richness separately for cladocerans and ostracods in 52 temporary pools in a small geographical area, relating species richness with habitat traits using multiple regressions. Habitat traits considered included surface area, water depth, permanence and sediment depth. Permanence was an important predictor of species richness of both cladocerans and ostracods. Additionally, variation in ostracod species richness was significantly explained by water depth (negative relationship) and sediment depth (positive relationship). Surface area was not a statistically significant factor in any of our analyses. The importance of permanence supports the hypothesis that extinction due to pool drying is a major driving force behind the structuring of microcrustacean communities in temporary pools. 相似文献
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P. De Deckker 《Hydrobiologia》1983,106(3):223-234
The knowledge of the ecology and distribution of ostracods from inland waters in Australia is reviewed. The large diversity of the athalassic saline fauna is discussed in detail and species diversity in different areas is analysed; salinity tolerance of the halobiont species is also presented. In addition discussion deals with hatching, permanent versus ephemeral water fauna, mode of locomotion, large size of some species, variation in size and ornamentation of shell. A brief characterization is attempted of the ostracods and the type of habitats in which they live. Finally, the distribution, species diversity in different areas and the endemicity of the fauna are outlined and a comparison of this fauna is made with that of other parts of the world. 相似文献