deuterostome
Enable an AI agent to recognize a deuterostome through evidenced taxonomic placement, interpret lineage-dependent traits, and route biological decisions to the appropriate descendant taxon or individual.
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 AI agent to recognize a deuterostome through evidenced taxonomic placement, interpret lineage-dependent traits, and route biological decisions to the appropriate descendant taxon or individual.
A deuterostome is an animal assigned to Deuterostomia, the traditional major bilaterian grouping that includes chordates, echinoderms and hemichordates and is named for an embryological pattern in which the mouth forms separately from the blastopore.
It can be Assess whether an organism or specimen belongs to Deuterostomia under a selected taxonomic treatment.; Route an identified member to its chordate, echinoderm, hemichordate, or narrower model.; Compare developmental observations across lineages while preserving stage and methodological differences.; Flag classifications based solely on blastopore fate, adult symmetry, or assumed vertebrate traits.; Request additional identification evidence and trace the effect of revised taxonomy on linked records.; Retrieve species- or population-specific handling and conservation constraints once identification is sufficiently resolved..
Distinguishing features
Require an evidenced lineage assignment under a named taxonomy; an anus-first developmental description alone does not establish Deuterostomia membership.
Distinguish deuterostome from vertebrate: membership also encompasses invertebrate lineages, so a backbone is not a required identification character.
Distinguish the taxonomic group Deuterostomia from an individual deuterostome; a group has a circumscription, while an individual has a life stage and condition.
Evaluate symmetry and diagnostic anatomy at the recorded life stage; adult appearance alone can obscure relationships across the included lineages.
Distinguish conventional taxonomic inclusion from demonstrated monophyly; phylogenomic support for the latter is contested. [Primary research](https://pubmed.ncbi.nlm.nih.gov/33741592/)
Scope
+ Deuterostomia membership, taxonomic treatment, and uncertainty in the group's evolutionary boundary
+ Placement among chordates, echinoderms, and hemichordates, with disputed lineages handled explicitly
+ Developmental observations relevant to deuterostomy, including exceptions and missing evidence
+ Life-stage-dependent anatomy and evidence supporting identification
+ Links to descendant species, populations, specimens, and their ecological or management records
- Complete species descriptions, accepted binomials, and species naming authorities
- Individual health, veterinary diagnosis, husbandry, and experimental protocols
- Population-specific abundance, native range, and conservation assessments
- Detailed models of chordates, echinoderms, hemichordates, and their narrower taxa
- Animal products, food commodities, pets, and pests as economic or social roles
Characteristics
- Referent level
- higher taxon | descendant taxon | population | individual | specimen Prevents assigning individual condition or species conservation status to the whole group.
- Taxonomic treatment
- Named classification or phylogenetic treatment with publication date or version and retrievable reference Makes membership reproducible when treatments disagree about rank or included lineages.
- Membership assessment
- supported under cited treatment | provisional | disputed | excluded | unresolved Separates confirmed placement from resemblance and unresolved evolutionary hypotheses.
- Assigned lineage
- Chordata | Echinodermata | Hemichordata | other explicitly justified placement | unresolved Determines which narrower biological model can supply applicable traits and actions.
- Taxonomy identifier mapping
- Verified NCBI and GBIF records where available, with matched name, rank, and retrieval date Prevents substituting an identifier for a species or similarly named group.
- Observed developmental stage
- embryo with staging system | larva | juvenile | adult | unknown Gives cleavage, symmetry, and anatomical observations their correct biological context.
- Blastopore fate
- contributes to anus | contributes to mouth | contributes to both | closes without either contribution | unresolved | not observed Records developmental evidence without turning the group's name into a universal diagnostic rule.
- Cleavage and coelom formation
- Separately described cleavage geometry and coelom formation mechanism, each linked to stage and evidence Supports comparison while preventing textbook character combinations from being imposed on every lineage.
- Stage-specific diagnostic anatomy
- Observed character linked to body region, stage, identification method, and proposed lineage Distinguishes useful lineage evidence from absent, reduced, or developmentally transient structures.
- Ecological and conservation applicability
- Habitat, range, or assessment record linked to the particular descendant taxon or population and date Avoids inventing a single habitat, native range, or IUCN category for Deuterostomia.
Where this came from
wikidata · CC0 1.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 6 bundles · 11 layers · 17 findings · 27 questions.
Taxonomic membership Establish what deuterostome means in the selected treatment and what biological entity is being classified.
This registry entry names membership in a broad animal group, so species-level defaults would misrepresent it.
Referent and name
Separate the organism sense from the higher taxon and its nomenclatural record.
Deuterostome referent
Record whether a statement concerns Deuterostomia itself or a particular member at a narrower biological level.
- Does this record describe Deuterostomia, a descendant taxon, a population, or an individual member? boundary
- Which source establishes the group's name, attributed authority, date, and rank in the selected treatment? provenance
Classification path
Resolve membership through a documented lineage and database mapping.
Supported lineage assignment
Connect the referent to its included lineage without assuming that every deuterostome is a chordate or vertebrate.
- What documented classification path places this referent within Deuterostomia? definition
- Which verified NCBI or GBIF records match the intended taxon and rank, and which mappings remain unavailable? provenance
Evolutionary boundary Represent phylogenetic hypotheses and uncertain inclusion separately from operational classification.
The model must remain usable without concealing disagreement about the group's monophyly or peripheral lineages.
Phylogenetic treatment
Attach evolutionary claims to the studies and analyses that support them.
Monophyly evidence
Record support and competing topologies rather than presenting deuterostome monophyly as settled; a primary phylogenomic analysis reports model-sensitive support. [Primary research](https://pubmed.ncbi.nlm.nih.gov/33741592/)
- Does the adopted analysis recover Chordata and Ambulacraria as an exclusive group, and with what support? measurement
- How do taxon sampling, evolutionary model, and sequence selection affect that result? provenance
Disputed and fossil placement
Handle uncertain living lineages and fossil assignments without silently expanding the registry concept.
Conditional inclusion
Keep alternative placements explicit, including any treatment of Xenacoelomorpha and proposed stem-group fossils.
- How does the selected treatment place Xenacoelomorpha, and does that placement change its operational deuterostome boundary? boundary
- For a fossil assignment, what evidence distinguishes crown membership, stem placement, and unresolved affinity? provenance
Developmental evidence Capture the observations behind developmental character claims.
Deuterostomy is easily confused with a necessary and sufficient membership test.
Gastrulation and opening fates
Describe the observed relationship between the blastopore, mouth, and anus.
Blastopore fate evidence
Separate observed tissue fate from an expectation inferred from the name deuterostome.
- What happens to the blastopore in this species, and how was continuity with the later openings established? measurement
- Is the claimed fate directly observed, inferred from related species, or unstudied? provenance
Cleavage and coelom
Treat early developmental characters as separately evidenced observations.
Developmental character variation
Record cleavage and coelom formation without requiring every member to exhibit one canonical developmental sequence.
- Which cleavage geometry and coelom formation process are documented, using what staging and observation methods? measurement
- Does an apparent exception reflect lineage variation, an incomparable stage, or inadequate evidence? boundary
Body plan and life stage Interpret identification characters in the context of lineage and development.
Included animals differ greatly in adult form, and diagnostically useful structures can be transient or reduced.
Lineage discrimination
Use combinations of characters to choose an appropriate descendant model.
Lineage character evidence
Evaluate stage-appropriate evidence such as chordate axial structures, echinoderm skeletal and water-vascular features, or hemichordate body organization.
- Which observed character combination supports chordate, echinoderm, or hemichordate placement? definition
- Could an apparently absent diagnostic structure be reduced, damaged, or absent only at the observed stage? boundary
Life-history transitions
Link developmental stages without transferring stage-specific traits indiscriminately.
Stage-linked identity
Connect embryonic, larval, juvenile, and adult records where those stages apply to the identified lineage.
- What evidence links the observed larval or juvenile form to the identified adult taxon? provenance
- Which changes in symmetry, locomotion, feeding, or diagnostic anatomy occur across its documented life stages? measurement
Ecological context and action routing Use broad membership to find applicable narrower evidence and decisions.
Deuterostome membership alone cannot establish habitat, conservation state, reproductive biology, or permissible handling.
Descendant-specific context
Attach ecological and reproductive information at the biological level supported by evidence.
Context applicability
Keep habitat, native range, sexual dimorphism, and conservation assessments tied to the relevant descendant taxon or population.
- Which identified taxon, population, and life stage does each habitat or reproductive claim describe? boundary
- If a conservation assessment applies, what are its assessed taxon, geographic scope, category, and assessment year? provenance
Identification-dependent actions
Determine what further identification or specialist model is needed before acting.
Action resolution threshold
Route collection, sampling, care, or release decisions to evidence appropriate to the actual animal and location.
- What identification resolution and contextual evidence are required for the proposed handling or sampling action? action
- Which narrower model or additional observation can resolve the missing evidence before that action proceeds? 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 higher animal taxon, not a species, population or individual; a species binomial and single IUCN assessment are inapplicable.
- The monophyly and deepest relationships of traditional Deuterostomia should be checked against current phylogenomic research.
- Developmental features associated with the name have exceptions and should be checked for the particular lineage being described.
- Which of these check these first hold for the sense of deuterostome this model covers, and on what evidence? provenance
Kinds and varieties
Recalled without web access and unsourced; every item is a lead to verify.
- Chordates
- Echinoderms
- Hemichordates
- Which of these kinds and varieties hold for the sense of deuterostome this model covers, and on what evidence? provenance
Identifiers and schemes
Recalled without web access and unsourced; every item is a lead to verify.
- NCBI Taxonomy - Numeric taxonomic identifier - Deuterostomia is a higher taxon, not a species with a binomial name.
- Which of these identifiers and schemes hold for the sense of deuterostome 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 taxonomy and evolutionary biology.
- Comparing embryonic development across animal lineages.
- Investigating the evolutionary origins of chordates and vertebrates.
- Which of these real-world use hold for the sense of deuterostome 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 blastopore fate, radial cleavage or enterocoely as universal diagnostic features despite developmental variation.
- Confusing membership in a higher taxonomic group with identification of a species or individual.
- Assigning a single habitat, body size or conservation status to the entire group.
- Which of these failure modes and hazards hold for the sense of deuterostome this model covers, and on what evidence? provenance
Regional variation
Recalled without web access and unsourced; every item is a lead to verify.
- Representatives occur worldwide; range and habitat must be specified for constituent taxa.
- Echinoderms and hemichordates are marine, whereas chordates also occupy freshwater and terrestrial environments.
- Which of these regional variation hold for the sense of deuterostome 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.
- Protostome - Belongs to the other traditional major bilaterian grouping; evolutionary placement is more reliable than a simple mouth-first versus anus-first developmental test.
- Chordate - A member of one constituent deuterostome lineage, characterised by a notochord at some stage of development.
- Ambulacrarian - Belongs to the grouping of echinoderms and hemichordates, excluding chordates.
- Vertebrate - Belongs to a subgroup within chordates; deuterostomes also include numerous invertebrate lineages.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of deuterostome this model covers, and on what evidence? provenance
What the second pass must settle
- Which taxonomic authority and version should govern this registry entry's rank, nomenclatural attribution, and verified NCBI and GBIF mappings?
- How should the model expose competing conclusions about deuterostome monophyly while maintaining a stable operational membership boundary?
- Which treatment of Xenacoelomorpha and proposed fossil stem groups should be adopted, and how should alternative assignments remain discoverable?
- Which lineage-specific observations substantiate blastopore fate, cleavage, and coelom formation, and where do textbook generalizations lack direct evidence?
- What minimum character or molecular evidence is sufficient to route unfamiliar larvae, reduced adults, or fragmentary specimens to a reliable descendant model?