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  • 1
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    Conqueria laevis gen. and sp. nov., a new soft-walled, monothalamous foraminiferan from the deep Weddell Sea
    Cambridge University Press (CUP) ; 2004
    In:  Journal of the Marine Biological Association of the United Kingdom Vol. 84, No. 5 ( 2004-10), p. 919-924
    Details
    In: Journal of the Marine Biological Association of the United Kingdom, Cambridge University Press (CUP), Vol. 84, No. 5 ( 2004-10), p. 919-924
    Abstract: Conqueria laevis gen. and sp. nov., a new monothalamous agglutinated foraminiferan, is described from core samples collected in the abyssal western Weddell Sea. The species is characterized by a very elongate, almost cylindrical test that usually follows a more or less curved course and has a single terminal aperture located at the end of a short neck. The wall has a very smooth outer surface and is composed of tiny ( 〈 5 μm) agglutinated particles. Very similar and presumably congeneric morphotypes occur at northern hemisphere sites, including Arctic fjords around Svalbard and the Porcupine Abyssal Plain. Molecular phylogenetic analyses, based on small subunit rRNA gene sequences, indicate that the new Weddell Sea species forms an independent lineage branching among monothalamous foraminiferans as a sister group to the clade of Psammophaga .
    Type of Medium: Online Resource
    ISSN: 0025-3154 , 1469-7769
    URL: Article
    DOI: 10.1017/S0025315404010197h
    RVK:
    WA 15000
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2004
    detail.hit.zdb_id: 1491269-7
    detail.hit.zdb_id: 281325-7
    SSG: 12
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  • 2
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    Molecular Identification of Algal Endosymbionts in Large Miliolid Foraminifera: 2. Dinoflagellates
    Wiley ; 2001
    In:  Journal of Eukaryotic Microbiology Vol. 48, No. 3 ( 2001-05), p. 368-373
    Details
    In: Journal of Eukaryotic Microbiology, Wiley, Vol. 48, No. 3 ( 2001-05), p. 368-373
    Abstract: ABSTRACT. Large miliolid foraminifers of the subfamily Soritinae bear symbiotic dinoflagellates morphologically similar to the species of the “ Symbiodinium ” complex, commonly found in corals and other marine invertebrates. Soritid foraminifers are abundant in coral reefs and it has been proposed that they share their symbionts with other dinoflagellate‐bearing reef dwellers. In order to test this hypothesis, we have analysed partial large subunit ribosomal DNA sequences from dinoflagellates symbionts obtained from 28 foraminiferal specimens, and compared them to the corresponding sequences of Symbiodinium ‐like endosymbionts from various groups of invertebrates. Phylogenetic analysis of our data shows that all soritid symbionts belong to the “ Symbiodinium ” species complex, within which they form seven different molecular types (Fr1–Fr7). Only one of these types (Fr1) branches within a group of invertebrate symbionts, previously described as type C. The remaining six types form sister groups to coral symbionts previously designed as types B, C, and D. Our data indicate a high genetic diversity and specificity of Symbiodinium ‐like symbionts in soritids. Except for type C, we have found no evidence for the transmission of symbionts between foraminifers and other symbiont‐bearing invertebrates from the same localities. However, exchanges must have occurred frequently between the different species of Soritinae, as suggested by the lack of host specificity and some biogeographical patterns observed in symbiont distribution. Our data suggest that members of the subfamily Soritinae acquired their symbionts at least three times during their history, each acquisition being followed by a rapid diversification and independent radiation of symbionts within the foraminiferal hosts.
    Type of Medium: Online Resource
    ISSN: 1066-5234 , 1550-7408
    URL: Issue
    URL: Article
    DOI: 10.1111/jeu.2001.48.issue-3
    DOI: 10.1111/j.1550-7408.2001.tb00326.x
    RVK:
    WA 15000
    Language: English
    Publisher: Wiley
    Publication Date: 2001
    detail.hit.zdb_id: 2126326-7
    SSG: 12
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  • 3
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    A Marine Dinoflagellate, Amphidinium eilatiensis n. sp., from the Benthos of a Mariculture Sedimentation Pond in Eilat, Israel
    Wiley ; 2003
    In:  The Journal of Eukaryotic Microbiology Vol. 50, No. 6 ( 2003-11), p. 439-448
    Details
    In: The Journal of Eukaryotic Microbiology, Wiley, Vol. 50, No. 6 ( 2003-11), p. 439-448
    Type of Medium: Online Resource
    ISSN: 1066-5234 , 1550-7408
    URL: Issue
    URL: Article
    DOI: 10.1111/jeu.2003.50.issue-6
    DOI: 10.1111/j.1550-7408.2003.tb00270.x
    RVK:
    WA 15000
    Language: English
    Publisher: Wiley
    Publication Date: 2003
    detail.hit.zdb_id: 2126326-7
    SSG: 12
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  • 4
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    Unexpected Foraminiferal Diversity Revealed by Small‐subunit rDNA Analysis of Antarctic Sediment
    Wiley ; 2004
    In:  Journal of Eukaryotic Microbiology Vol. 51, No. 2 ( 2004-03), p. 173-179
    Details
    In: Journal of Eukaryotic Microbiology, Wiley, Vol. 51, No. 2 ( 2004-03), p. 173-179
    Abstract: ABSTRACT. Studies of benthic Foraminifera typically rely on the morphological identification of dried specimens. This approach can introduce sampling bias against small, delicate, or morphologically ambiguous forms. To overcome this limitation, we extracted total DNA from sediment followed by PCR using group‐ and species‐specific primers. Phylogenetic analyses revealed that approximately ninety percent of the PCR products represented previously undescribed sequence types that group with undersampled members of the allogromiid Foraminifera. We also used a modification of this technique to track individual species in sediment fractions too fine for normal morphological identification, and to confirm species placement of morphologically ambiguous foraminiferans. We were able to identify the DNA of several large foraminiferal species in fine fractions in a seasonally‐dependent manner, indicating that in some seasons the majority of the standing stock of these species exists as gametes/juveniles. The approach outlined here represents a powerful strategy for exploring the total diversity of benthic foraminiferal communities.
    Type of Medium: Online Resource
    ISSN: 1066-5234 , 1550-7408
    URL: Issue
    URL: Article
    DOI: 10.1111/jeu.2004.51.issue-2
    DOI: 10.1111/j.1550-7408.2004.tb00542.x
    RVK:
    WA 15000
    Language: English
    Publisher: Wiley
    Publication Date: 2004
    detail.hit.zdb_id: 2126326-7
    SSG: 12
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  • 5
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    Molecular Phylogenetic Analysis Places Percolomonas cosmopolites within Heterolobosea: Evolutionary Implications
    Wiley ; 2004
    In:  Journal of Eukaryotic Microbiology Vol. 51, No. 5 ( 2004-09), p. 575-581
    Details
    In: Journal of Eukaryotic Microbiology, Wiley, Vol. 51, No. 5 ( 2004-09), p. 575-581
    Abstract: Percolomonas cosmopolitus is a common free‐living flagellate of uncertain phylogenetic position that was placed within the Heterolobosea on the basis of ultrastructure studies. To test the relationship between Percolomonas and Heterolobosea, we analysed the primary structure of the actin and small‐subunit ribosomal RNA (SSU rRNA) genes of P. cosmopolitus as well as the predicted secondary structure of the SSU rRNA. Percolomonas shares common secondary structure patterns of the SSU rRNA with heterolobosean taxa, which, together with the results of actin gene analysis, confirms that it is closely related to Heterolobosea. Phylogenetic reconstructions based on the sequences of the SSU rRNA gene suggest Percolomonas belongs to the family Vahlkampliidae. The first Bayesian analysis of a large taxon sampling of heterolobosean SSU rRNA genes clarifies the phylogenetic relationships within this group.
    Type of Medium: Online Resource
    ISSN: 1066-5234 , 1550-7408
    URL: Issue
    URL: Article
    DOI: 10.1111/jeu.2004.51.issue-5
    DOI: 10.1111/j.1550-7408.2004.tb00294.x
    RVK:
    WA 15000
    Language: English
    Publisher: Wiley
    Publication Date: 2004
    detail.hit.zdb_id: 2126326-7
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  • 6
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    Molecular Identification of Algal Endosymbionts in Large Miliolid Foraminifera: 1. Chlorophytes
    Wiley ; 2001
    In:  Journal of Eukaryotic Microbiology Vol. 48, No. 3 ( 2001-05), p. 362-367
    Details
    In: Journal of Eukaryotic Microbiology, Wiley, Vol. 48, No. 3 ( 2001-05), p. 362-367
    Abstract: ABSTRACT. Large miliolid foraminifers bear various types of algal endosymbionts including chlorophytes, dinoflagellates, rhodophytes, and diatoms. Symbiosis plays a key role in the adaptation of large foraminifera to survival and growth in oligotrophic seas. The identity and diversity of foraminiferal symbionts, however, remain largely unknown. In the present work we use ribosomal DNA (rDNA) sequences to identify chlorophyte endosymbionts in large miliolid foraminifera of the superfamily Soritacea. Partial 18S and complete Internal Transcribed Spacer (ITS) rDNA sequences were obtained from symbionts of eight species representing all genera of extant chlorophyte‐bearing Soritacea. Phylogenetic analysis of the sequences confirms the previous fine structure‐based identification of these endosymbionts as belonging to the genus Chlamydomonas. All foraminiferal symbionts form a monophyletic group closely related to Chlamydomonas noctigama. The group is composed of seven types identified in this study, including one previously morphologically described species, Chlamydomonas hedleyi. Each of these types can be considered as a separate species, based on the comparison of genetic differences observed between other established Chlamydomonas species. Several foraminiferal species share the same symbiont type, but only one species, Archaias angulatus , was found to bear more than one type.
    Type of Medium: Online Resource
    ISSN: 1066-5234 , 1550-7408
    URL: Issue
    URL: Article
    DOI: 10.1111/jeu.2001.48.issue-3
    DOI: 10.1111/j.1550-7408.2001.tb00325.x
    RVK:
    WA 15000
    Language: English
    Publisher: Wiley
    Publication Date: 2001
    detail.hit.zdb_id: 2126326-7
    SSG: 12
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  • 7
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    Freshwater Foraminiferans Revealed by Analysis of Environmental DNA Samples
    Wiley ; 2003
    In:  Journal of Eukaryotic Microbiology Vol. 50, No. 2 ( 2003-03), p. 135-139
    Details
    In: Journal of Eukaryotic Microbiology, Wiley, Vol. 50, No. 2 ( 2003-03), p. 135-139
    Abstract: ABSTRACT. Sediment‐dwelling protists are among the most abundant meiobenthic organisms, ubiquitous in all types of aquatic ecosystems. Yet, because their isolation and identification are difficult, their diversity remains largely unknown. In the present work, we applied molecular methods to examine the diversity of freshwater Foraminifera, a group of granuloreticulosan protists largely neglected until now. By using specific PCR primers, we detected the presence of Foraminifera in all sediment samples examined. Phylogenetic analysis of amplified SSU rDNA sequences revealed two distinct groups of freshwater foraminiferans. All obtained sequences branched within monothalamous (single‐chambered), marine Foraminifera, suggesting a repeated colonization of freshwater environments. The results of our study challenge the traditional view of Foraminifera as essentially marine organisms, and provide a conceptual framework for charting the molecular diversity of freshwater granuloreticulosan protists.
    Type of Medium: Online Resource
    ISSN: 1066-5234 , 1550-7408
    URL: Issue
    URL: Article
    DOI: 10.1111/jeu.2003.50.issue-2
    DOI: 10.1111/j.1550-7408.2003.tb00248.x
    RVK:
    WA 15000
    Language: English
    Publisher: Wiley
    Publication Date: 2003
    detail.hit.zdb_id: 2126326-7
    SSG: 12
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  • 8
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    The twilight of Heliozoa and rise of Rhizaria, an emerging supergroup of amoeboid eukaryotes
    Proceedings of the National Academy of Sciences ; 2004
    In:  Proceedings of the National Academy of Sciences Vol. 101, No. 21 ( 2004-05-25), p. 8066-8071
    Details
    In: Proceedings of the National Academy of Sciences, Proceedings of the National Academy of Sciences, Vol. 101, No. 21 ( 2004-05-25), p. 8066-8071
    Abstract: Recent molecular phylogenetic studies revealed the extraordinary diversity of single-celled eukaryotes. However, the proper assessment of this diversity and accurate reconstruction of the eukaryote phylogeny are still impeded by the lack of molecular data for some major groups of easily identifiable and cultivable protists. Among them, amoeboid eukaryotes have been notably absent from molecular phylogenies, despite their diversity, complexity, and abundance. To partly fill this phylogenetic gap, we present here combined small-subunit ribosomal RNA and actin sequence data for the three main groups of “Heliozoa” (Actinophryida, Centrohelida, and Desmothoracida), the heliozoan-like Sticholonche , and the radiolarian group Polycystinea. Phylogenetic analyses of our sequences demonstrate the polyphyly of heliozoans, which branch either as an independent eukaryotic lineage (Centrohelida), within stramenopiles (Actinophryida), or among cercozoans (Desmothoracida), in broad agreement with previous ultrastructure-based studies. Our data also provide solid evidence for the existence of the Rhizaria, an emerging supergroup of mainly amoeboid eukaryotes that includes desmothoracid heliozoans, all radiolarians, Sticholonche , and foraminiferans, as well as various filose and reticulose amoebae and some flagellates.
    Type of Medium: Online Resource
    ISSN: 0027-8424 , 1091-6490
    URL: Article
    DOI: 10.1073/pnas.0308602101
    RVK:
    TA 1000
    RVK:
    WA 15000
    Language: English
    Publisher: Proceedings of the National Academy of Sciences
    Publication Date: 2004
    detail.hit.zdb_id: 209104-5
    detail.hit.zdb_id: 1461794-8
    SSG: 11
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  • 9
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    Evolution of Antp-class genes and differential expression of Hydra Hox/paraHox genes in anterior patterning
    Proceedings of the National Academy of Sciences ; 2000
    In:  Proceedings of the National Academy of Sciences Vol. 97, No. 9 ( 2000-04-25), p. 4493-4498
    Details
    In: Proceedings of the National Academy of Sciences, Proceedings of the National Academy of Sciences, Vol. 97, No. 9 ( 2000-04-25), p. 4493-4498
    Abstract: The conservation of developmental functions exerted by Antp-class homeoproteins in protostomes and deuterostomes suggested that homologs with related functions are present in diploblastic animals. Our phylogenetic analyses showed that Antp-class homeodomains belong either to non-Hox or to Hox/paraHox families. Among the 13 non-Hox families, 9 have diploblastic homologs, Msx , Emx , Barx , Evx , Tlx , NK-2 , and Prh/Hex , Not , and Dlx , reported here. Among the Hox/paraHox, poriferan sequences were not found, and the cnidarian sequences formed at least five distinct cnox families. Two are significantly related to the paraHox Gsx (cnox-2) and the mox (cnox-5) sequences, whereas three display some relatedness to the Hox paralog groups 1 (cnox-1), 9/10 (cnox-3) and the paraHox cdx (cnox-4). Intermediate Hox/paraHox genes (PG 3 to 8 and lox ) did not have clear cnidarian counterparts. In Hydra , cnox-1 , cnox-2 , and cnox-3 were not found chromosomally linked within a 150-kb range and displayed specific expression patterns in the adult head. During regeneration, cnox-1 was expressed as an early gene whatever the polarity, whereas cnox-2 was up-regulated later during head but not foot regeneration. Finally, cnox-3 expression was reestablished in the adult head once it was fully formed. These results suggest that the Hydra genes related to anterior Hox/paraHox genes are involved at different stages of apical differentiation. However, the positional information defining the oral/aboral axis in Hydra cannot be correlated strictly to that characterizing the anterior–posterior axis in vertebrates or arthropods.
    Type of Medium: Online Resource
    ISSN: 0027-8424 , 1091-6490
    URL: Article
    DOI: 10.1073/pnas.97.9.4493
    RVK:
    TA 1000
    RVK:
    WA 15000
    Language: English
    Publisher: Proceedings of the National Academy of Sciences
    Publication Date: 2000
    detail.hit.zdb_id: 209104-5
    detail.hit.zdb_id: 1461794-8
    SSG: 11
    SSG: 12
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  • 10
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    Molecular phylogeny of Foraminifera a review
    Elsevier BV ; 2002
    In:  European Journal of Protistology Vol. 38, No. 1 ( 2002-1), p. 1-10
    Details
    In: European Journal of Protistology, Elsevier BV, Vol. 38, No. 1 ( 2002-1), p. 1-10
    Type of Medium: Online Resource
    ISSN: 0932-4739
    URL: Article
    DOI: 10.1078/0932-4739-00857
    RVK:
    WA 15000
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2002
    detail.hit.zdb_id: 2047872-0
    SSG: 12
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