protostome
Enable an agent to recognise a protostome as an animal assigned to Protostomia, evaluate evidence for that assignment, and determine which biological interpretations or actions require a narrower taxon.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
recalled by Codex without web access - no source was read
Researched by: Codex
Purpose and description
Enable an agent to recognise a protostome as an animal assigned to Protostomia, evaluate evidence for that assignment, and determine which biological interpretations or actions require a narrower taxon.
A protostome is an animal belonging to Protostomia, a major bilaterian clade that includes arthropods, nematodes, molluscs and annelids, whose membership reflects evolutionary ancestry rather than a universally shared embryonic fate of the blastopore.
It can be Resolve a supplied animal or taxon name to a sourced classification and trace its proposed membership in Protostomia.; Compare competing placements and retain unresolved assignments with their supporting evidence.; Check whether a developmental description reports an observation or repeats a historical generalisation.; Route an identified protostome to a narrower lineage or species model for habitat, life history and conservation information.; Reject clade-level inference of husbandry, collection, treatment or pest-control actions when the required species and local context are absent..
Distinguishing features
An assignment to Protostomia must resolve through a stated taxonomic or phylogenetic treatment; superficial resemblance to a worm or insect is insufficient.
Protostome is narrower than invertebrate: an animal's lack of a vertebral column does not establish protostome membership.
The historical association with a blastopore becoming the mouth must be distinguished from evidence of clade membership; blastopore fate alone is not a universal identification test.
Ecdysozoan and spiralian placements can support protostome assignment when the adopted classification explicitly nests them within Protostomia.
A protostome individual, a species assigned to Protostomia and the clade itself are different subjects; none should inherit the other's measurements or assessment status automatically.
Scope
+ The relationship between an animal described as a protostome and the clade Protostomia
+ Evidence, authority and uncertainty supporting protostome assignment
+ Placement within major protostome lineages and their constituent taxa
+ Developmental characteristics historically associated with protostomes and the limits of those characteristics
+ Boundaries on transferring traits, ecological claims and action permissions across the clade
- Complete species descriptions, accepted binomials and species identification procedures
- Individual health, husbandry, treatment and experimental protocols
- Population abundance, local distribution and conservation assessments
- Detailed models of particular organs, developmental mechanisms or genomes
- Commercial, pet, pest or food classifications of particular protostome animals
Characteristics
- Subject level
- clade concept | constituent taxon | population | individual | specimen Prevents clade membership from being mistaken for a species identity or an individual biological state.
- Protostomia membership
- supported | provisional | disputed | excluded | unresolved Makes assignment uncertainty explicit before downstream biological claims are applied.
- Taxonomic placement
- Links to the identified taxon, Protostomia and intervening lineages under a named classification Shows the ancestry path supporting membership and provides the route to narrower models.
- Classification authority
- Source, taxon identifier, treatment date and database or publication version Allows an agent to reconcile different circumscriptions and reproduce the classification used.
- Assignment evidence
- taxonomic lookup | molecular phylogeny | morphology | developmental observation | combined evidence Distinguishes an inherited database assignment from an independently investigated placement.
- Observed blastopore fate
- mouth contribution | anus contribution | contribution to both | neither | ambiguous | unobserved; qualified by taxon and developmental stage Records actual development without treating the name protostome as an observation.
- Observed cleavage pattern
- Source-described cleavage pattern with taxon, stage and observation conditions; unknown permitted Supports developmental comparison without imposing a single cleavage pattern on the entire clade.
- Trait applicability
- Claim linked to the taxa, stages and evidence for which it is supported Prevents traits of a familiar protostome group from becoming defaults for all protostomes.
Where this came from
wikidata · CC0 1.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 5 bundles · 9 layers · 15 findings · 23 questions.
Identity and circumscription Establishes what the term protostome denotes in a record and which treatment defines its membership.
Protostome can describe an individual animal or refer collectively to a broad clade; those uses require different interpretation.
Subject and sense
Separates the clade concept from organisms and taxa assigned to it.
Membership is not subject identity
Record whether the subject is Protostomia itself or a taxon, population or organism described as belonging to it.
- Does this record describe the clade Protostomia, a constituent taxon or a particular animal? definition
- Which assertions concern membership, and which concern only the recorded organism or narrower taxon? boundary
Classification reference
Anchors the clade concept to a reproducible taxonomic treatment.
Sourced clade concept
Use a cited circumscription and source-specific identifiers rather than assuming Protostomia is a species with a binomial.
- Which authority, treatment date and taxon identifier define Protostomia for this record? provenance
- Does another relevant treatment use a different rank, circumscription or placement that changes interpretation? boundary
Membership and lineage evidence Evaluates why the subject is assigned to Protostomia and how precisely its lineage is known.
A broad anatomical label cannot substitute for a supported placement, particularly for poorly identified or disputed material.
Assignment support
Connects a proposed membership to the evidence and identification it depends on.
Traceable membership
Record the taxonomic lookup, phylogenetic analysis or character evidence supporting assignment and retain its limitations.
- What source or analysis supports placing this animal or taxon within Protostomia? provenance
- Is uncertainty caused by specimen identification, evolutionary placement or disagreement between classifications? boundary
Internal lineage resolution
Finds the narrowest supported placement within the adopted protostome classification.
Supported descendant placement
Preserve the supported ancestry path, including ecdysozoan or spiralian placement where applicable, without forcing unsupported precision.
- What is the narrowest supported descendant taxon, and how does the adopted classification connect it to Protostomia? definition
- Which additional identification evidence would permit routing this subject to a more specific model? action
Development and character limits Separates observed embryology from historical expectations attached to the protostome name.
Treating mouth formation or cleavage as universal diagnostic rules would misrepresent developmental diversity.
Blastopore fate
Records the developmental fate of the blastopore only where relevant observations support it.
Observed fate over name
Keep protostome membership separate from claims about the blastopore's contribution to the mouth or anus.
- What blastopore fate was observed, in which taxon and developmental stages, and by what method? measurement
- Does the cited evidence establish blastopore fate directly, or merely infer it from the protostome label? provenance
Cleavage and body development
Qualifies cleavage, cell-fate and body-cavity descriptions by their actual biological scope.
Developmental traits have limited scope
Treat cleavage geometry, cell-fate determination and body-cavity formation as separately evidenced characteristics rather than a compulsory protostome package.
- Which cleavage, cell-fate or body-cavity characteristics have been documented for the subject's taxon? measurement
- Across which taxa and stages is each developmental claim supported, and where are exceptions or missing observations recorded? boundary
Biological context and action boundaries Controls how protostome membership informs ecological interpretation and decisions involving actual animals.
Protostomia is too broad to supply a single habitat, life cycle, conservation status or handling procedure.
Ecology and life-history scope
Links biological context to the narrower taxa, populations and stages for which it is known.
No clade-wide species profile
Require appropriate taxonomic and geographic scope before applying claims about habitat, range, reproduction, dimorphism or conservation.
- Which narrower taxon, population and life stage support the proposed habitat, range or life-history description? boundary
- If a conservation status is supplied, which assessed taxon, geographic scope, authority and assessment year does it concern? provenance
Decisions and model handoff
Uses broad membership to guide further identification and select the appropriate decision context.
Membership does not authorise intervention
A protostome assignment can support classification and comparison; interventions require evidence about the actual animal and its circumstances.
- Which narrower model and contextual evidence are needed before collection, husbandry, treatment or control can be evaluated? action
- What further observation or identification step would most reduce uncertainty relevant to the proposed action? action
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Check these first
Recalled without web access and unsourced; every item is a lead to verify.
- This describes membership in a high-level animal clade, not a particular species; species-level binomials, conservation assessments and native ranges do not apply collectively.
- Taxonomic authority, date and exact database identifiers are omitted because they are not confidently recalled.
- Detailed relationships among early bilaterian lineages and the circumscription of some spiralian subgroups should be checked against current phylogenetic research.
- Which of these check these first hold for the sense of protostome this model covers, and on what evidence? provenance
Kinds and varieties
Recalled without web access and unsourced; every item is a lead to verify.
- Ecdysozoans, including arthropods and nematodes
- Spiralians, including molluscs, annelids and flatworms
- Which of these kinds and varieties hold for the sense of protostome this model covers, and on what evidence? provenance
Identifiers and schemes
Recalled without web access and unsourced; every item is a lead to verify.
- Scientific taxon name - Protostomia - A clade name, not a species binomial.
- NCBI Taxonomy ID - positive integer - Identifies a taxon record; the specific identifier is not supplied from recall.
- Which of these identifiers and schemes hold for the sense of protostome this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Organising animal diversity in evolutionary classification.
- Comparing embryonic development and body plans across animal lineages.
- Providing evolutionary context for model organisms such as fruit flies and nematodes.
- Which of these real-world use hold for the sense of protostome this model covers, and on what evidence? provenance
Failure modes and hazards
Recalled without web access and unsourced; every item is a lead to verify.
- Treating mouth formation from the blastopore as a universal diagnostic character; developmental patterns vary.
- Confusing a clade with a species, population or individual organism.
- Assigning one conservation status, native range or life cycle to all protostomes.
- Assuming spiral cleavage characterises every protostome.
- Which of these failure modes and hazards hold for the sense of protostome this model covers, and on what evidence? provenance
Regional variation
Recalled without web access and unsourced; every item is a lead to verify.
- Protostomes occur worldwide in marine, freshwater and terrestrial environments; constituent species have distinct distributions.
- Which of these regional variation hold for the sense of protostome this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Recalled without web access and unsourced; every item is a lead to verify.
- Bilateria - The broader animal clade containing Protostomia and other bilaterian lineages.
- Deuterostomia - Traditionally groups chordates, echinoderms and hemichordates outside Protostomia; ancestry is more reliable than blastopore fate for distinguishing membership.
- Invertebrate - An informal category for animals without vertebral columns that includes protostomes and many animals outside Protostomia.
- Ecdysozoa - A constituent protostome clade characterised by moulting an external cuticle.
- Spiralia - A constituent protostome clade named for spiral cleavage, although that developmental pattern is not retained in every member.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of protostome this model covers, and on what evidence? provenance
What the second pass must settle
- Which taxonomic treatment, authorship attribution, date and source-specific identifiers should anchor the registry's Protostomia concept?
- Which current disagreements about internal protostome relationships materially affect the ancestry paths this model should represent?
- Which primary comparative studies best establish the limits and exceptions of blastopore-fate, cleavage and body-cavity generalisations?
- What evidence threshold should distinguish supported, provisional and unresolved membership for unidentified specimens, fossils and molecular samples?
- Does the existing Vercy catalogue already contain a Protostomia or equivalent clade model that this registry entry should link to as its single source of truth?