Journal of Nannoplankton Research最新文献

{"title":"Syracosphaera azureaplaneta sp. nov. and revision of Syracosphaera corolla Lecal, 1966.","authors":"J. Young, P. Bown, L. Cros, K. Hagino, R. Jordan","doi":"10.58998/jnr2301","DOIUrl":"https://doi.org/10.58998/jnr2301","url":null,"abstract":"Here we show that the extant coccolithophore Syracosphaera corolla Lecal, 1966 comprises two consistently \u0000different non-intergrading morphotypes characterised respectively by exothecal coccoliths with wide and \u0000narrow central-areas. These are interpreted as separate species and so a new species is described, S. azureaplaneta, \u0000and a revised description is given for S. corolla.","PeriodicalId":186533,"journal":{"name":"Journal of Nannoplankton Research","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129142086","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Calcareous nannofossils from the Eocene North Atlantic Ocean (IODP Expedition 342 Sites U1403–1411).","authors":"P. Bown, C. Newsam","doi":"10.58998/jnr2026","DOIUrl":"https://doi.org/10.58998/jnr2026","url":null,"abstract":"Integrated Ocean Drilling Program Expedition 342 (June-July 2012) cored nine sites and 18 \u0000holes (Sites U1403-U1411) on the J-Anomaly and the Southeast Newfoundland ridges in the \u0000NW Atlantic Ocean. These sites recovered sections ranging from Pleistocene to upper Albian, \u0000but the expedition particularly focussed on the recovery of expanded Paleogene successions \u0000with high quality microfossil preservation. This was achieved by choosing sites with thick \u0000packages of drift-type sediments on topographic highs that would maximise the preservation of \u0000carbonate. The expedition suceeded in recovering middle Eocene to lower Oligocene and upper \u0000Oligocene to lower Miocene high sedimentation rate sediment sequences with very well \u0000preserved microfossils. Highlights of the expedition include the recovery of continuous \u0000Eocene/Oligocene and Oligocene/Miocene boundaries, a Cretaceous-Paleogene boundary \u0000section with intact spherule layer, and Cenomanian/Turonian section with a 44 cm black shale. \u0000Here, we describe notable aspects of the Eocene nannofossil record, including the exceptional \u0000preservation and the evolution of several important Eocene groups: Nannotetrina, the \u0000Sphenolithus furcatolithoides group, the Reticulofenestra bisecta group and the Coccolithus \u0000gigas group. We also present a taxonomic overview of the Eocene nannofossil assemblages \u0000from Sites U1403-1411, illustrating 164 taxa and describing 25 new species (Blackites \u0000friedrichii, Blackites sextonii, Blackites subtilis, Calcidiscus scullyae, Clausicoccus norrisii, \u0000Coccolithus hulliae, Coccolithus opdykei, Cruciplacolithus nishii, Helicosphaera prolixa, \u0000Holodiscolithus agniniae, Holodiscolithus lippertii, Holodiscolithus liuii, Holodiscolithus \u0000whitesideae, Nannotetrina plana, Nannotetrina ruda, Neococcolithes purus, Neococcolithes \u0000radiatus, Pontosphaera brinkhuisii, Pontosphaera hollisii, Pontosphaera romansii, \u0000Pontosphaera wilsonii, Reticulofenestra magniscutum, Scyphosphaera interstincta, \u0000Semihololithus pseudobiskayae, Syracosphaera octiforma) and five new combinations \u0000(Blackites inversus, Pontosphaera zigzag, Reticulofenestra erbae, Reticulofenestra isabellae, \u0000Umbilicosphaera elliptica).","PeriodicalId":186533,"journal":{"name":"Journal of Nannoplankton Research","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122864098","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"New and intriguing calcareous nannofossils from the Turonian (Upper Cretaceous) of Tanzania.","authors":"J. Lees, P. Bown","doi":"10.58998/jnr2160","DOIUrl":"https://doi.org/10.58998/jnr2160","url":null,"abstract":"The preservation of exceptionally well-preserved, primary associations of calcareous nannofossils on \u0000lamina surfaces of shallowly-buried, uncemented, clay-rich Turonian sediments of coastal Tanzania has enabled us \u0000to document several intriguing new morphologies using the scanning electron microscope (SEM). Based on our new \u0000observations, we describe a new genus, Jimenezberrocosoia, and six new species, J. birchiae, Ellipsolithus linnertii, \u0000Petrarhabdus? kirenii, Braarudosphaera wendleriae, Nannoconus funiculus and Kokia kayae. We have also made \u0000two new combinations, Jimenezberrocosoia bosunensis (Jeremiah, 2001) and Nannoconus nicholasii (Lees, 2007), \u0000and emended the Order Braarudosphaerales to include the Nannoconaceae. Most of the taxa are illustrated with both \u0000SEM and light microscope images. The presence of Ellipsolithus in these Cretaceous sediments greatly extends the \u0000range of this formerly Cenozoic-restricted taxon.","PeriodicalId":186533,"journal":{"name":"Journal of Nannoplankton Research","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129688736","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Paleocene calcareous nannofossils from Tanzania (TDP sites 19, 27 and 38).","authors":"P. Bown","doi":"10.58998/jnr2033","DOIUrl":"https://doi.org/10.58998/jnr2033","url":null,"abstract":"This paper documents the nannofossil record from the oldest yet recovered Paleogene sediments \u0000– Selandian to Thanetian (Zone NP5-7) – from the Tanzania Drilling Project. These sediments \u0000include frequent horizons with exceptionally preserved nannofossils and very high diversities. The \u0000observation of this high quality preservation extends the stratigraphic record of the Tanzanian \u0000Kilwa Group microfossil lagerstatte into the Paleocene. These new records include the oldest yet \u0000stratigraphic occurrences of a number of modern coccolithophore groups – the Pontosphaeraceae \u0000(Pontosphaera), Rhabdosphaeraceae (Blackites), Syracosphaeraceae (Syracosphaera), \u0000Calcidiscaceae (Calcidiscus), Gladiolithus and Solisphaera – indicating that the majority of Cenozoic \u0000coccolithophore diversity was established during the Paleocene radiation, soon after the \u0000Cretaceous-Paleogene boundary extinctions. The frequent and consistent occurrence of the \u0000Mesozoic taxon Zeugrhabdotus embergeri in Zone NP5, suggests this is a second Zeugrhabdotus \u0000survivor species. Sixteen new species are described: Braarudosphaera insecta, Bramletteius \u0000cultellus, Coccolithus subcirculus, Ericsonia aliquanta, Ericsonia media, Ericsonia monilis, Ericsonia \u0000orbis, Ellipsolithus pumex, Lanternithus unicavus, Pontosphaera veta, Solisphaera tegula, \u0000Solisphaera palmula, Toweius patellus, Toweius reticulum, Youngilithus transversipons and \u0000Youngilithus bipons. Emended taxonomic definitions are proposed for Prinsius martini and Prinsius \u0000bisulcus.","PeriodicalId":186533,"journal":{"name":"Journal of Nannoplankton Research","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116549364","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A mixed life-cycle stage bloom of Syracosphaera bannockii (Borsetti and Cati, 1976) Cros et al. 2000 (Bay of Biscay April 2010).","authors":"C. Daniels, T. Tyrrell, A. Poulton, J. Young","doi":"10.58998/jnr2075","DOIUrl":"https://doi.org/10.58998/jnr2075","url":null,"abstract":"High concentrations (464 cells mL-1) of Syracosphaera bannockii have been identified for the first time, in the Bay of Biscay during April 2010. These high concentrations combined with coccolithophore community dominance (~87%) indicated that a bloom of S. bannockii had formed. While the bloom consisted mostly of heterococcolith coccospheres, both holococcolith coccospheres and holococcolith-heterococcolith combination coccospheres were observed. This is only the second time that combination coccospheres of S. bannockii have been observed.","PeriodicalId":186533,"journal":{"name":"Journal of Nannoplankton Research","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116978237","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Two unusual silicoflagellate double skeletons.","authors":"K. Mccartney, E. Malinverno, M. Schweizer, Jakub Witkowski, J. Young","doi":"10.58998/jnr2174","DOIUrl":"https://doi.org/10.58998/jnr2174","url":null,"abstract":"A study of silicoflagellate double skeletons revealed two unusual doublets that are illustrated and discussed here. One of these comprises two ten-sided Octactis skeletons that appear to form a doublet, but both in the same (apical) orientation. The other specimen is a double skeleton of Dictyocha that is slightly disarticulated, with a third, less robust skeleton in between. These unusual double skeletons suggest that there is much more to be learned about the formation of silicoflagellate skeletons and the reproductive processes in this protist group.","PeriodicalId":186533,"journal":{"name":"Journal of Nannoplankton Research","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130081844","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Eocene nannofossil biostratigraphy of the mid-Waipara River section, Canterbury Basin, New Zealand.","authors":"C. Shepherd, D. Kulhanek, C. Hollis","doi":"10.3301/ROL.2014.118","DOIUrl":"https://doi.org/10.3301/ROL.2014.118","url":null,"abstract":"Samples collected from the middle reaches of the Waipara River, northern Canterbury Basin, New Zealand, provide a detailed record of calcareous nannofossil assemblages from lower Eocene to uppermost middle Eocene sediments of this southwestern Pacific, mid-paleolatitude region (~52°S). Biostratigraphic analysis indicates an almost complete section spanning nannofossil Zones NP10 to NP16 (Ypresian to Bartonian Stages), with a hiatus that encompasses all of NP15 (Lutetian Stage) and likely portions of upper NP14 and lower NP16. There is also evidence for an unconformity that includes part of upper NP10 and lower NP11, which is also found in other New Zealand sections. This paper documents the biostratigraphy and calcareous nannofossil assemblages of the mid-Waipara River section.","PeriodicalId":186533,"journal":{"name":"Journal of Nannoplankton Research","volume":"177 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124381294","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The morphological response of Emiliania huxleyi to seawater carbonate chemistry changes: an inter-strain comparison.","authors":"G. Langer, I. Probert, G. Nehrke, P. Ziveri","doi":"10.1594/PANGAEA.826456","DOIUrl":"https://doi.org/10.1594/PANGAEA.826456","url":null,"abstract":"Four strains of the coccolithophore Emiliania huxleyi (RCC1212, RCC1216, RCC1238, RCC1256) were grown in dilute batch culture at four CO 2 levels ranging from ~200 µatm to ~1200 µatm. Coccolith morphology was analyzed based on scanning electron micrographs. Three of the four strains did not exhibit a change in morphol- ogy over the CO 2 range tested. One strain (RCC1256) displayed an increase in the percentage of malformed coccoliths with increasing CO 2 concentration. We conclude that the sensitivity of the coccolith-shaping machinery to carbonate chemistry changes is strain-specific. Although it has been shown before that carbonate chemistry related changes in growth- and calcification rate are strain-specific, there seems to be no consistent correlation between coccolith mor - phology and growth or calcification rate. We did not observe an increase in the percentage of incomplete coccoliths in RCC1256, indicating that the coccolith-shaping machinery per se is affected by acidification and not the signalling pathway that produces the stop-signal for coccolith growth.","PeriodicalId":186533,"journal":{"name":"Journal of Nannoplankton Research","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122447969","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Didemnid ascidian spicules from the Arabian Peninsula.","authors":"O. Varol","doi":"10.58998/jnr2258","DOIUrl":"https://doi.org/10.58998/jnr2258","url":null,"abstract":"","PeriodicalId":186533,"journal":{"name":"Journal of Nannoplankton Research","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125471397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Discoaster orbis nom. nov. pro Discoaster circularis Furrazola-Bermudez and Kreisel, 1972, non Hoffmann, 1970.","authors":"D. D. Reimers, Denise O. Daigre","doi":"10.58998/nina2208","DOIUrl":"https://doi.org/10.58998/nina2208","url":null,"abstract":"","PeriodicalId":186533,"journal":{"name":"Journal of Nannoplankton Research","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1985-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130442460","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}