Origin of the foraminifera.

Wray, Charles G.; Langer, Martin R.; DeSalle, Rob; Lee, John J.; Lipps, Jere H.

doi:10.1073/pnas.92.1.141

Cited by 29 publications

(5 citation statements)

References 18 publications

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“…Geographical mapping of the polyrhabdinid environmental samples reveals their worldwide distribution: deep sea sediment from the East Sea ( Park et al, 2008 ), sediment from seashores of Denmark ( Karst et al, 2018 ), sediment of mangrove system in Brazil ( Santos et al, 2010 ), methane cold seep in Sagami Bay in Japan, the tidal flat on Disko Island near Greenland, Cariaco basin in the Caribbean Sea near Venezuela, marine stromatolites near the Bahamas ( Baumgartner et al, 2009 ; Stoeck, Taylor & Epstein, 2003 ; Stoeck et al, 2007 ; Takishita et al, 2007 ), and a clone derived from the foraminiferan Ammonia beccarii ( Wray et al, 1995 ). The identification of the latter sequence as a foraminiferan was refuted ( Pawlowski et al, 1996 ), and it probably originated by either pseudoparasitism, occasional ingestion of a gregarine oocysts by the foraminiferan (see Rueckert et al (2011) for similar cases of misidentification).…”

Section: Discussionmentioning

confidence: 99%

Evidence from the resurrected family Polyrhabdinidae Kamm, 1922 (Apicomplexa: Gregarinomorpha) supports the epimerite, an attachment organelle, as a major eugregarine innovation

Paskerova

Miroliubova

Valigurová

et al. 2021

PeerJ

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Background Gregarines are a major group of apicomplexan parasites of invertebrates. The gregarine classification is largely incomplete because it relies primarily on light microscopy, while electron microscopy and molecular data in the group are fragmentary and often do not overlap. A key characteristic in gregarine taxonomy is the structure and function of their attachment organelles (AOs). AOs have been commonly classified as “mucrons” or “epimerites” based on their association with other cellular traits such as septation. An alternative proposal focused on the AOs structure, functional role, and developmental fate has recently restricted the terms “mucron” to archigregarines and “epimerite” to eugregarines. Methods Light microscopy and scanning and transmission electron microscopy, molecular phylogenetic analyses of ribosomal RNA genes. Results We obtained the first data on fine morphology of aseptate eugregarines Polyrhabdina pygospionis and Polyrhabdina cf. spionis, the type species. We demonstrate that their AOs differ from the mucron in archigregarines and represent an epimerite structurally resembling that in other eugregarines examined using electron microscopy. We then used the concatenated ribosomal operon DNA sequences (SSU, 5.8S, and LSU rDNA) of P. pygospionis to explore the phylogeny of eugregarines with a resolution superior to SSU rDNA alone. The obtained phylogenies show that the Polyrhabdina clade represents an independent, deep-branching family in the Ancoroidea clade within eugregarines. Combined, these results lend strong support to the hypothesis that the epimerite is a synapomorphic innovation of eugregarines. Based on these findings, we resurrect the family Polyrhabdinidae Kamm, 1922 and erect and diagnose the family Trollidiidae fam. n. within the superfamily Ancoroidea Simdyanov et al., 2017. Additionally, we re-describe the characteristics of P. pygospionis, emend the diagnoses of the genus Polyrhabdina, the family Polyrhabdinidae, and the superfamily Ancoroidea.

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Section: Discussionmentioning

confidence: 99%

Evidence from the resurrected family Polyrhabdinidae Kamm, 1922 (Apicomplexa: Gregarinomorpha) supports the epimerite, an attachment organelle, as a major eugregarine innovation

Paskerova

Miroliubova

Valigurová

et al. 2021

PeerJ

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“…This feature of the method is highly relevant to studies of systematics as well as the ecological studies addressed here. Species‐specific oligonucleotides can also be coupled to a fluorophore or radioisotope and used as a probe for in situ hybridization (Wray et al 1995). By this method, a DNA sequence can be used to identify a morphological type of foraminiferan that corresponds to a particular molecular type.…”

Section: Discussionmentioning

confidence: 99%

Unexpected Foraminiferal Diversity Revealed by Small‐subunit rDNA Analysis of Antarctic Sediment

Habura

Pawłowski

Hanes

et al. 2004

J Eukaryotic Microbiology

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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.

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“…The new sequence from S. serpulae was aligned with 51 other alveolate SSU rDNA sequences using MacClade 4 (D. R. Maddison & W. P. Maddison 2000) and visual fine‐tuning. The apicomplexan sequence misattributed to the foraminiferan Ammonia beccarii (U07937) was omitted from the analyses because this sequence is missing data (Wray et al . 1995; Leander et al .…”

Section: Methodsmentioning

confidence: 99%

Molecular phylogeny and ultrastructure of Selenidium serpulae (Apicomplexa, Archigregarinia) from the calcareous tubeworm Serpula vermicularis (Annelida, Polychaeta, Sabellida)

Leander¹

2007

Zoologica Scripta

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213 Leander, B. S. (2007). Molecular phylogeny and ultrastructure of Selenidium serpulae (Apicomplexa, Archigregarinia) from the calcareous tubeworm Serpula vermicularis (Annelida, Polychaeta, Sabellida). 36 ,[213][214][215][216][217][218][219][220][221][222][223][224][225][226][227] Archigregarines are dynamic single-celled parasites that inhabit the intestinal systems of marine invertebrates, especially suspension feeding and deposit feeding polychaetes. Certain archigregarines in the genus Selenidium have retained several plesiomorphic characters, and improved knowledge of these species is expected to shed considerable light onto the earliest stages in apicomplexan evolution. Although archigregarines are related to some of the most notorious parasites known (e.g., C ryptosporidium and Plasmodium ), current knowledge of the group is meagre. In an attempt to improve our understanding of archigregarine diversity and evolution, I have characterised the general ultrastructure and molecular phylogenetic position of Selenidium serpulae (Lankester) Caullery and Mesnil. The parasites were isolated from the intestines of the calcareous tubeworm Serpula vermicularis (Polychaeta) collected in the eastern Pacific Ocean. The trophozoites (extracellular feeding stages) were spindle-shaped and capable of slow and continuous bending, and coiling, especially when dislodged from the host epithelium. The trophozoite surface was composed of 19 -23 longitudinal folds, prominent transverse folds and a robust, trilayered pellicle subtended by a single row of microtubules, each surrounded by an electron transparent sheath. Putative mitochondria were observed, but they were inconspicuous and apparently highly reduced, a condition that is indicative of anaerobic metabolism. The small subunit (SSU) rDNA sequence from S. serpulae was very closely related to two (short) sequences derived from an environmental PCR survey of an oxygendepleted hydrothermal vent system in the Gulf of California, namely C1-E017 (AY046619) and C2-E016 (AY046806). This result suggested that archigregarines with a morphology and lifecycle much like that in S. serpulae are thriving in this oxygen poor ecosystem. In addition, phylogenetic analyses of a larger SSU rDNA dataset (excluding the shorter environmental sequences) indicated that the nearest sister lineage to S. serpulae was S. vivax , a bizarre tape-like gregarine found in the intestines of sipunculids. This relationship was bolstered by comparative ultrastructural data and helped to illustrate that the diversification and biogeographical distribution of archigregarine parasites is probably more extensive than usually assumed.

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Origin of the foraminifera.

Cited by 29 publications

References 18 publications

Evidence from the resurrected family Polyrhabdinidae Kamm, 1922 (Apicomplexa: Gregarinomorpha) supports the epimerite, an attachment organelle, as a major eugregarine innovation

Evidence from the resurrected family Polyrhabdinidae Kamm, 1922 (Apicomplexa: Gregarinomorpha) supports the epimerite, an attachment organelle, as a major eugregarine innovation

Unexpected Foraminiferal Diversity Revealed by Small‐subunit rDNA Analysis of Antarctic Sediment

Molecular phylogeny and ultrastructure of Selenidium serpulae (Apicomplexa, Archigregarinia) from the calcareous tubeworm Serpula vermicularis (Annelida, Polychaeta, Sabellida)

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