identifier: traitmech:000624 label: paedogamy definition: A sexual-reproduction phenotype in which two gametes produced by division within a single gametangium fuse with each other. definition_source: DOI:10.1080/0269249X.2013.791344 trait_category: PHYSIOLOGY term_kind: CLASS mapping_status: PROPOSED parent_traits: - traitmech:000625 synonyms: - synonym_text: pedogamy synonym_type: EXACT_SYNONYM source: DOI:10.3390/d14121133 evidence: - reference: DOI:10.1080/0269249X.2013.791344 snippet: fusion of two gametes within a single gametangium notes: Kaczmarska et al. (2013), p.271, section 5.2.1, contiguous definition phrase in the directly read author-posted full text at https://www.researchgate.net/publication/259079699_Proposals_for_a_terminology_for_diatom_sexual_reproduction_auxospores_and_resting_stages. Cytokinesis distinguishes gametes from the undivided-cell nuclear fusion of section 5.2.2. Section 5.2 treats both as automixis, not equivalent names. This is terminology synthesis, not independent experimental replication of its cited Neidium study. Actual diagrams were not visually inspected. Do not make meiosis-I cytokinesis or immediate gametic-nuclear fusion universal requirements. - reference: DOI:10.3390/d14121133 snippet: Afterwards, the protoplasts (gametes) fused to form a zygote (auxospore) notes: 'Bagmet et al. (2022), Results 3.3, p.9, clause before the Figure 3J,K citation, checked in publisher XML and typeset PDF. Abstract, Methods 2.1-2.5, Results 3.3, Discussion 4.1 and Table S1 were read; actual Figure 3 and pp.8-9 were inspected. Four clones were active: VCA-7, VCA-48, VCA-49 and VCA-51; VCA-50 and VCA-52 showed no mating. The authors call this pedogamy. Preserve their apparently-qualified interpretation of earlier Figure 3G,H; do not infer tracked nuclear fusion from chloroplast images. Seasonal observations and unsuccessful salt stimulation are study-specific. Plastid rbcL comparisons do not establish absence of genomic recombination.' - reference: DOI:10.1007/s12223-008-0018-x snippet: The gametic nuclei fused after auxospore expansion had begun. notes: Poulickova (2008), PMID:18500631, scientific abstract directly retrieved from Europe PMC and PubMed. Unpaired Neidium cf. ampliatum cells differentiated into gametangia and underwent pedogamy. The quoted timing cautions against conflating gamete fusion with immediate nuclear fusion. Full text, actual figures and strain provenance remain unread. Preserve cf.; no exact species mapping or canonical Neidium example is asserted. canonical_examples: - taxon_id: NCBITaxon:1302829 taxon_label: Nitzschia acidoclinata reference: DOI:10.3390/d14121133 note: Qualified VCA-7 example, one of the four sexually active clones in Results 3.3, not every tested clone. Table S1 traces VCA-7 to wet ground in Gonduras Cave, Krasnoyarsk Territory, collected 2011-02-19; Methods 2.1 describes single-cell isolation and subsequent culture. Provenance table directly inspected in https://mdpi-res.com/d_attachment/diversity/diversity-14-01133/article_deploy/diversity-14-01133-s001.zip. NCBI https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?id=1302829 and taxonomy EFetch checked on 2026-10-05 resolve this species name; this does not authenticate a genome or current culture accession. discussions: - discussion_id: paedogamy-scope-and-hierarchy prompt: Separate gamete-cell fusion from autogamy and broader selfing. kind: CURATION_TODO status: OPEN rationale: Use the single-gametangium gamete-fusion sense established in the cited diatom literature. Autogamy traitmech:000622 denotes gametic-nuclear fusion in an unpaired undivided cell, without fusion of separate gametes; cytogamy traitmech:000623 concerns paired cells without nuclear exchange. Automixis is broader in Kaczmarska et al. section 5.2 and is not an exact synonym. Bagmet et al. calls automixis homothallic, whereas our existing homothallism traitmech:000609 is fungal-scoped; this usage does not make that record a parent. The parent gap is resolved by automixis traitmech:000625, whose single-meiotic-cell nuclear origin includes this operational scope. The broader terminology and mapping questions keep this discussion OPEN. Do not infer species-level disjointness or universal homozygosity, recombination rate, seasonal trigger or inability to outcross. Broader non-diatom usage and external equivalences need primary source review before expanding this operational scope. posed_by: codex posed_date: '2026-10-05' - discussion_id: paedogamy-mechanism-and-coverage prompt: Resolve nuclear cytology and molecular mechanisms beyond morphology. kind: KNOWLEDGE_GAP status: OPEN rationale: This is a reproductive phenotype, not a literal locus or a plastid-marker sequence feature. The directly inspected microscopy supports a gamete-fusion interpretation but does not identify a protein-resolved causal pathway. No causal graph or accession-level protein claim is inferred from chloroplast shape, sequence similarity or terminology. Full Neidium methods and provenance, and stronger nuclear observations in the Nitzschia system, remain coverage gaps. Retain actual snippet-resolver outcomes separately from direct PDF, XML and abstract checks. posed_by: codex posed_date: '2026-10-05' curation_history: - timestamp: '2026-10-05T17:13:00Z' curator: codex action: MINTED_TRAITMECH_ID changes: Added paedogamy with three DOI-backed snippets, a pedogamy spelling synonym and qualified natural VCA-7 example. Ignored-and-hidden novelty/allocation searches found no exact record or collision. Reserved METPO:1057700 in v500. Distinguished gamete fusion from autogamy and broader automixis; deferred molecular graphs and mappings. llm_assisted: true - timestamp: '2026-10-05T18:20:28Z' curator: codex action: RESOLVED_PARENT_GAP changes: Reparented below automixis traitmech:000625 and documented the resolved parent gap while retaining other open terminology and mapping questions. Preserved definition, evidence, examples and prior history. v501 carries the existing proposed METPO ID with this hierarchy; earlier standalone templates remain historical. llm_assisted: true