Subtopic Deep Dive
Myxozoan Molecular Phylogeny
Research Guide
What is Myxozoan Molecular Phylogeny?
Myxozoan Molecular Phylogeny reconstructs the evolutionary relationships of Myxozoa within Cnidaria using SSU rDNA and multigene analyses including EF-2.
Researchers apply SSU rDNA sequencing to position Myxozoa as derived cnidarians, resolving deep nodes in Medusozoa (Collins, 2002; 346 citations). Multigene approaches with rDNA and EF-2 data trace character evolution and host-switching events (Fiala and Bartošová‐Sojková, 2010; 137 citations). Over 10 key papers from 1998-2018 establish taxonomic foundations with ~3,000 combined citations.
Why It Matters
Accurate Myxozoan phylogeny enables precise classification of pathogens like Kudoa thyrsites in commercial fish, reducing aquaculture losses (Whipps et al., 2003; 279 citations). It reveals host-switching patterns critical for predicting disease outbreaks in wild salmon, as seen in proliferative kidney disease cases (Sterud et al., 2007; 104 citations). Taxonomic revisions from SSU rDNA data support biodiversity assessments and control strategies (Okamura et al., 2018; 142 citations).
Key Research Challenges
Long-branch attraction artifacts
SSU rDNA trees suffer from long-branch attraction, distorting Myxozoa-Cnidaria placement (Collins, 2002). Multigene data like EF-2 partially mitigate this but require broader sampling (Fiala and Bartošová‐Sojková, 2010). Resolution demands advanced models beyond maximum parsimony.
Sparse actinospore sampling
Actinospore stages remain under-sampled, hindering complete life-cycle phylogenies (Lom and Dyková, 2006; 854 citations). Molecular data from spores is rare, complicating host-parasite matching. This gaps evolutionary reconstructions of alternation.
Host-switching detection
Distinguishing co-speciation from host-switching requires dense taxon sampling across fish hosts (Whipps et al., 2003). Current phylogenies lack power for cophylogenetic reconciliation. Multigene approaches show promise but need refinement (Fiala and Bartošová‐Sojková, 2010).
Essential Papers
Myxozoan genera: definition and notes on taxonomy, life-cycle terminology and pathogenic species
J. Lom, Iva Dyková · 2006 · Folia Parasitologica · 854 citations
A list of myxozoan genera is presented in the current taxonomical scheme. These genera are defined; their type species and most important pathogens along with their hosts are listed. Simultaneously...
Phylogeny of Medusozoa and the evolution of cnidarian life cycles
Allen G. Collins · 2002 · Journal of Evolutionary Biology · 346 citations
Abstract To investigate the evolution of cnidarian life cycles, data from the small subunit of the ribosome are used to derive a phylogenetic hypothesis for Medusozoa. These data indicate that Cnid...
First Report of Three <i>Kudoa</i> Species from Eastern Australia: <i>Kudoa thyrsites</i> from Mahi mahi (<i>Coryphaena hippurus</i>), <i>Kudoa amamiensis</i> and <i>Kudoa minithyrsites</i> n. sp. from Sweeper (<i>Pempheris ypsilychnus</i>)
Christopher M. Whipps, Robert D. Adlard, MAL S. BRYANT et al. · 2003 · Journal of Eukaryotic Microbiology · 279 citations
ABSTRACT. Fish species around the world are parasitized by myxozoans of the genus Kudoa , several of which infect and cause damage of commercial importance. In particular, Kudoa thyrsites and Kudoa...
Extensive Uncharted Biodiversity: The Parasite Dimension
Beth Okamura, Ashlie Hartigan, Juliana Naldoni · 2018 · Integrative and Comparative Biology · 142 citations
Parasites are often hidden in their hosts and exhibit patchy spatial distributions. This makes them relatively difficult to detect and sample. Consequently we have poor knowledge of parasite divers...
History of myxozoan character evolution on the basis of rDNA and EF-2 data
Ivan Fiala, Pavla Bartošová‐Sojková · 2010 · BMC Evolutionary Biology · 137 citations
Guide to the identification of fish protozoan and metazoan parasites in stained tissue sections
D. W. Bruno, Barbara F. Nowak, DG Elliott · 2006 · Diseases of Aquatic Organisms · 134 citations
The identification of protozoan and metazoan parasites is traditionally carried out using a series of classical keys based upon the morphology of the whole organism. However, in stained tissue sect...
Severe mortality in wild Atlantic salmon Salmo salar due to proliferative kidney disease (PKD) caused by Tetracapsuloides bryosalmonae (Myxozoa)
E Sterud, Torbjørn Forseth, Ola Ugedal et al. · 2007 · Diseases of Aquatic Organisms · 104 citations
Extensive mortality in Atlantic salmon fry was reported in the River Aelva from 2002 to 2004. Dead fish were collected in late summer 2006, and live fish were sampled by electrofishing in September...
Reading Guide
Foundational Papers
Start with Lom and Dyková (2006; 854 citations) for genus definitions, then Collins (2002; 346 citations) for SSU rDNA Cnidaria placement, followed by Fiala and Bartošová‐Sojková (2010; 137 citations) for multigene evolution.
Recent Advances
Okamura et al. (2018; 142 citations) on parasite biodiversity; Sterud et al. (2007; 104 citations) links phylogeny to salmon PKD outbreaks.
Core Methods
SSU rDNA PCR amplification and alignment; Bayesian inference with MrBayes; EF-2 for deep nodes; morphological integration for spore identification (Collins, 2002; Fiala and Bartošová‐Sojková, 2010).
How PapersFlow Helps You Research Myxozoan Molecular Phylogeny
Discover & Search
Research Agent uses searchPapers('Myxozoan SSU rDNA phylogeny Cnidaria') to retrieve Collins (2002), then citationGraph reveals 346 downstream citations including Fiala (2010), while findSimilarPapers on Lom (2006) uncovers actinospore taxonomy papers, and exaSearch scans 250M+ papers for unpublished preprints.
Analyze & Verify
Analysis Agent applies readPaperContent on Fiala (2010) to extract EF-2 alignment details, verifyResponse with CoVe cross-checks Myxozoa monophyly claims against Collins (2002), and runPythonAnalysis computes bootstrap values from pasted rDNA matrices using ete3, with GRADE scoring evidence strength for cnidarian placement.
Synthesize & Write
Synthesis Agent detects gaps in actinospore phylogenies via contradiction flagging across Lom (2006) and Whipps (2003), while Writing Agent uses latexEditText for phylogeny manuscripts, latexSyncCitations integrates 10 foundational papers, latexCompile renders trees, and exportMermaid generates host-switching diagrams.
Use Cases
"Run phylogenetic bootstrap analysis on Myxozoan SSU rDNA datasets from key papers"
Research Agent → searchPapers('Myxozoan rDNA alignment') → Analysis Agent → runPythonAnalysis(ete3 bootstrap on pasted FASTA from Fiala 2010) → matplotlib tree plot with support values.
"Draft LaTeX review on Myxozoa position in Cnidaria with citations"
Synthesis Agent → gap detection on Collins 2002 + Lom 2006 → Writing Agent → latexGenerateFigure(phylogeny), latexSyncCitations(10 papers), latexCompile → PDF with resolved Medusozoa tree.
"Find code for Myxozoan multigene phylogeny reconstruction"
Research Agent → paperExtractUrls(Fiala 2010) → Code Discovery → paperFindGithubRepo(rDNA EF-2 pipelines) → githubRepoInspect → runnable Nextflow workflow for MrBayes analyses.
Automated Workflows
Deep Research workflow scans 50+ Myxozoan papers via searchPapers → citationGraph → structured report ranking SSU vs multigene support. DeepScan's 7-step chain verifies Collins (2002) claims with CoVe checkpoints and Python re-analysis of rDNA data. Theorizer generates hypotheses on host-switching from Fiala (2010) character evolution data.
Frequently Asked Questions
What defines Myxozoan Molecular Phylogeny?
It reconstructs Myxozoa evolution within Cnidaria using SSU rDNA and EF-2 genes, resolving Medusozoa placement (Collins, 2002; Fiala and Bartošová‐Sojková, 2010).
What methods are used?
SSU rDNA sequencing with maximum likelihood or Bayesian inference; multigene sets add EF-2 for character evolution (Collins, 2002; Fiala and Bartošová‐Sojková, 2010).
What are key papers?
Foundational: Lom and Dyková (2006; 854 citations) on genera; Collins (2002; 346 citations) on Medusozoa; Fiala (2010; 137 citations) on rDNA/EF-2 evolution.
What open problems remain?
Actinospore undersampling blocks life-cycle trees (Lom and Dyková, 2006); long-branch artifacts persist; host-switching needs cophylogenetic models (Whipps et al., 2003).
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