Fusiforma themisticola n. gen., n. sp., a New Genus and Species of Apostome Ciliate Infecting the Hyperiid Amphipod Themisto libellula in the Canadian Beaufort Sea (Arctic Ocean), and Establishment of the Pseudocolliniidae (Ciliophora, Apostomatia)

Chantangsi, Chitchai; Lynn, Denis H.; Rueckert, Sonja; Prokopowicz, A.; Panha, Somsak; Leander, Brian S.

doi:10.1016/j.protis.2013.09.001

Cited by 20 publications

(29 citation statements)

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“…Without DNA sequence data it is uncertain whether this parasite is taxonomically novel or not. Parasitic ciliates have been noted in amphipods in the past, such as Fusiforma themisticola Chantangsi, Lynn, Rueckert, Prokopowicz, Panha & Leander, 2013, which parasitizes Themisto libellula (Lichtenstein in Mandt) [41]. …”

Section: Discussionmentioning

confidence: 99%

Parasites, pathogens and commensals in the “low-impact” non-native amphipod host Gammarus roeselii

et al. 2017

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BackgroundWhilst vastly understudied, pathogens of non-native species (NNS) are increasingly recognised as important threats to native wildlife. This study builds upon recent recommendations for improved screening for pathogens in NNS by focusing on populations of Gammarus roeselii in Chojna, north-western Poland. At this location, and in other parts of continental Europe, G. roeselii is considered a well-established and relatively ‘low-impact’ invader, with little understanding about its underlying pathogen profile and even less on potential spill-over of these pathogens to native species.ResultsUsing a combination of histological, ultrastructural and phylogenetic approaches, we define a pathogen profile for non-native populations of G. roeselii in Poland. This profile comprised acanthocephalans (Polymorphus minutus Goese, 1782 and Pomphorhynchus sp.), digenean trematodes, commensal rotifers, commensal and parasitic ciliated protists, gregarines, microsporidia, a putative rickettsia-like organism, filamentous bacteria and two viral pathogens, the majority of which are previously unknown to science. To demonstrate potential for such pathogenic risks to be characterised from a taxonomic perspective, one of the pathogens, a novel microsporidian, is described based upon its pathology, developmental cycle and SSU rRNA gene phylogeny. The novel microsporidian Cucumispora roeselii n. sp. displayed closest morphological and phylogenetic similarity to two previously described taxa, Cucumispora dikerogammari (Ovcharenko & Kurandina, 1987), and Cucumispora ornata Bojko, Dunn, Stebbing, Ross, Kerr & Stentiford, 2015.ConclusionsIn addition to our discovery extending the host range for the genus Cucumispora Ovcharenko, Bacela, Wilkinson, Ironside, Rigaud & Wattier, 2010 outside of the amphipod host genus Dikerogammarus Stebbing, we reveal significant potential for the co-transfer of (previously unknown) pathogens alongside this host when invading novel locations. This study highlights the importance of pre-invasion screening of low-impact NNS and, provides a means to document and potentially mitigate the additional risks posed by previously unknown pathogens.Electronic supplementary materialThe online version of this article (doi:10.1186/s13071-017-2108-6) contains supplementary material, which is available to authorized users.

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Section: Discussionmentioning

confidence: 99%

Parasites, pathogens and commensals in the “low-impact” non-native amphipod host Gammarus roeselii

et al. 2017

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“…Pseudocollinia species are most closely related to Fusiforma themisticola, recently described as a parasitoid in the hemocoel of the zooplanktonic hyperiid amphipod Themisto libelulla collected in the Canadian Beaufort Sea (Arctic Ocean) (Chantangsi et al 2013). Fusiforma along with Pseudocollinia species are currently assigned to the family Pseudocolliniidae, which is in turn closely related to other known histophagous parasitoid apostome ciliates that infect other crustaceans like decapods and copepods (Fig.…”

Section: Gene Sequences Of Pseudocollinia Speciesmentioning

confidence: 99%

“…nov. and P. oregonensis are separated by 50% sequence divergence. Scale bars = 10 substitutions per 100 nucleotides Fusiforma themisticola, a newly discovered apostome that infects the hyperiid amphipod Themisto libellula (Chantangsi et al 2013). Gómez-Gutiérrez et al (2012) reexamined the type slide of P. oregonensis and determined that, while it could be placed in the genus Pseudocollinia, higher-quality protargol stains would be useful to characterize the protomite-tomite stage more fully.…”

Section: T Spinifera (29) Hq965963mentioning

confidence: 99%

Ciliate species diversity and host-parasitoid codiversification in Pseudocollinia infecting krill, with description of Pseudocollinia similis sp. nov.

Gómez‐Gutiérrez¹,

Strüder‐Kypke²,

Shaw³

2014

Dis. Aquat. Org.

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All parasitoid apostome ciliates infecting krill in the northeastern Pacific are currently assigned to the genus Pseudocollinia. Each krill specimen is apparently infected by only 1 Pseudocollinia species. We describe Pseudocollinia similis sp. nov., discovered infecting the krill Thysanoessa spinifera off Oregon, USA. Its protomite-tomite stage resembles that of P. beringensis, which infects T. inermis (type host species), T. longipes, and T. raschii females in the Bering Sea. These ciliates have similar numbers of somatic kineties (18-21 vs. 16-20) and typically have 3 oral kineties. Furthermore, these 2 apostomes are sister species on gene trees based on sequences of small subunit rRNA (0.06% difference) and cytochrome c oxidase subunit 1 (cox1; 30% difference). P. brintoni and P. oregonensis are closely related as a separate group from P. similis and P. beringensis. The similar tree topologies based on the cox1 sequences of 21 host krill individuals representing 6 krill species (Euphausia pacifica, Nyctiphanes simplex, T. inermis, T. longipes, T. raschii, and T. spinifera) and the apostomes isolated from these krill suggest host-parasitoid codiversification. However, this hypothesis was statistically rejected by an approximately unbiased test in which the host tree topology was used to model parasitoid evolution (p ≤ 0.05).

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“…Recent investigations of this class have demonstrated that it is much more diverse than previously assumed (Chantangsi et al 2013;Liu et al 2016;Pan H. et al 2016;Pan X. et al , 2017Schuster and Bright 2016), which highlights the need to conduct further studies on oligohymenophorean ciliates.…”

Section: Introductionmentioning

confidence: 97%

Morphological Redescription and SSU rDNA-based Phylogeny of Two Freshwater Ciliates, Uronema nigricans and Lembadion lucens (Ciliophora, Oligohymenophorea), with Discussion on the Taxonomic Status of Uronemita sinensis

Liu¹,

Li²,

Qu³

et al. 2017

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Abstract. The morphology and phylogeny of two poorly known species, Uronema nigricans (Müller, 1786) Florentin, 1901 and Lembadion lucens (Maskell, 1887) Kahl, 1931, were respectively collected from a eutrophic freshwater river in Shenzhen and an oligotrophic lake in Zhanjiang (both in southern China) and investigated using standard taxonomic methods. The sampled population of Uronema nigricans was characterized by a cell size of 30-40 μm × 12-20 μm in vivo, an elongated elliptical outline with a prominent apical plate, and 13-15 somatic kineties. The sampled population of Lembadion lucens was characterized by a cell size of 45-80 μm × 20-50 μm in vivo, 25-35 somatic kineties, five or six caudal kinetosomes with cilia about 20 μm in length, and a single right-positioned contractile vacuole. The small subunit ribosomal RNA gene (SSU rDNA) of these species was sequenced and compared with those of their congeners to reveal nucleotide differences. The phylogenetic trees showed that the Shenzhen population of Uronema nigricans clusters with two other sequences under the name of "Uronema nigricans" (which are possibly misidentified) and then groups with Uronemita sinensis (Pan et al., 2013) Liu et al., 2016 with full support. Phylogenetic analyses indicated that genus Lembadion is monophyletic with full support provided by both Bayesian inference and maximum likelihood algorithms. Based on analyses of morphological and sequence data, Uronemita sinensis may represent a new genus between Uronema and Uronemita.

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Fusiforma themisticola n. gen., n. sp., a New Genus and Species of Apostome Ciliate Infecting the Hyperiid Amphipod Themisto libellula in the Canadian Beaufort Sea (Arctic Ocean), and Establishment of the Pseudocolliniidae (Ciliophora, Apostomatia)

Cited by 20 publications

References 21 publications

Parasites, pathogens and commensals in the “low-impact” non-native amphipod host Gammarus roeselii

Parasites, pathogens and commensals in the “low-impact” non-native amphipod host Gammarus roeselii

Ciliate species diversity and host-parasitoid codiversification in Pseudocollinia infecting krill, with description of Pseudocollinia similis sp. nov.

Morphological Redescription and SSU rDNA-based Phylogeny of Two Freshwater Ciliates, Uronema nigricans and Lembadion lucens (Ciliophora, Oligohymenophorea), with Discussion on the Taxonomic Status of Uronemita sinensis

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