TraitMech

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pallium feeding

traitmech:000632 · CLASS · PROPOSED

A physiological phenotype in which a microbial organism feeds by enveloping all or part of particulate food in an extruded membranous pallium, digesting it outside the main cell body, and taking up released nutrients.

Trait evidence (3)

  • DOI:10.1111/j.1529-8817.1986.tb00021.x
    The contents of the phytoplankton prey are liquified and transported through the pallium

    Direct scientific Abstract quote, printed p. 249; original spelling retained. Institutional scan: https://www.whoi.edu/cms/files/Jacobson_%26_Anderson_1986_JP_feeding_30828.pdf. All seven available pages (249-252, 256-258), Table 1 and actual Figures 1, 2 and 23 were inspected. Pages 253-255 and Figures 3-22 are missing from this copy and were not audited. Figure 2B shows Oblea rotunda feeding on Pyramimonas sp. Discussion p. 256 distinguishes complete from partial enclosure; Table 1 also lists detrital food. Neither living prey nor a particular prey size, taxon, capture filament or digestion time is a universal requirement.

  • DOI:10.1111/j.0022-3646.1992.00069.x
    the prey cytoplasm is liquified within the pallium

    Direct Introduction quote, printed p. 69, not an abstract quote. Complete 14-page institutional scan and actual Figures 1-46 inspected at https://www.whoi.edu/cms/files/Jacobson%26Anderson_1992_Proto-ultrastructrure_31161.pdf. Results describe five feeding cells named Protoperidinium spinulosum by the authors. Figures 9-12 show the pallium and degraded diatom contents outside the main cell body; Figures 1 and 46 are reconstructions. Discussion p. 81 leaves inner-membrane loss during fixation versus in vivo reorganization unresolved. Morphology does not demonstrate specific digestive proteins or a complete transport mechanism. No canonical taxon assignment is made from this culture.

  • DOI:10.4319/lo.1993.38.5.0965
    Laboratory experiments were performed to determine the growth and grazing capabilities of Oblea rotunda, a pallium-feeding dinoflagellate.

    Direct scientific Abstract from the publisher page at https://aslopubs.onlinelibrary.wiley.com/doi/10.4319/lo.1993.38.5.0965. Supports the feeding-mode name and growth on several phytoplankton foods. Only the abstract was inspected; Methods, figures and culture provenance were not audited. The laboratory culture is not equated with the field specimens in the 1986 canonical example. Behavioral responses do not identify a molecular receptor.

Provenance

Identifier source
TraitMech local identifier
Definition source
DOI:10.1111/j.1529-8817.1986.tb00021.x

Parent traits (1)

kg-microbe context

No kg-microbe node embedding matched this record in the 2026-04-25 deepwalk.

Canonical examples (1)

Organisms cited as exemplars of this trait. Taxon ids are NCBITaxon and link out to the NCBI record.

  • Oblea rotunda NCBITaxon:402581 DOI:10.1111/j.1529-8817.1986.tb00021.x Qualified example: naturally collected specimens in the 1986 study, Table 1 and Figure 2B, not all isolates. Methods p. 249 at https://www.whoi.edu/cms/files/Jacobson_%26_Anderson_1986_JP_feeding_30828.pdf report net tows from Perch Pond or Vineyard Sound, Massachusetts, followed by short laboratory incubation and microscopy. No strain identifier or single collection site is assigned to this example. Figure 2B depicts pallium deployment around Pyramimonas sp. NCBI ESearch and EFetch verified the species name, rank and Peridiniopsis rotunda synonym on 2026-10-06.

Discussions and Knowledge Gaps (2)

Open questions attached to this trait. Seeded by just knowledge-gap-scan and curated; see the corpus-wide index.

Reconcile feeding-mode terminology and membrane topology.

CURATION TODO OPEN pallium-feeding-topology-and-parent · raised by codex · 2026-10-06

Not yet attached to a section of this record — a curator sets attaches_to (e.g. causal_graphs#some_edge) so the gap shows beside the mechanism it concerns.

This is an organismal feeding phenotype, not the pallium structure or a sequence feature. The 1986 Discussion p. 256 calls complete enclosure intracellular digestion in a vacuole outside the theca, but partial enclosure extracellular digestion, and questions that terminological division. Its engulfment wording need not mean whole particles enter the main cell body. Local phagocytosis traitmech:000627 requires enclosure and internalization; phagotrophy traitmech:000628 requires particulate ingestion and nutrient assimilation. Myzocytosis traitmech:000631 denotes prey-content aspiration through a localized connection, not an enveloping feeding veil. Retain phenotype METPO:1000059 pending a closer feeding hierarchy. Do not assert universal extracellular membrane topology or disjoint organismal feeding capabilities. Ordinary extracellular digestion or attachment alone is insufficient. No unverified synonym or ontology equivalence is asserted.

Resolve membrane dynamics and native protein functions.

KNOWLEDGE GAP OPEN pallium-feeding-native-mechanism · raised by codex · 2026-10-06

Not yet attached to a section of this record — a curator sets attaches_to (e.g. causal_graphs#some_edge) so the gap shows beside the mechanism it concerns.

The 1992 Discussion proposes digestive-granule functions, membrane storage and transport routes from ultrastructure. It explicitly leaves fixation artifacts versus biological inner-membrane reorganization unresolved and requests time-course evidence. Apparatus similarity to peduncles does not prove identical feeding mechanics or protein function. Obtain taxon-paired functional and accession evidence before adding protein examples or a causal graph. No actin, centrin or enzyme accession is inferred from micrographs, and no gene or profile is treated as proof of this feeding phenotype.

Curation history

  1. · MINTED_TRAITMECH_ID · codex

    Added pallium feeding with three DOI-backed snippets and a natural-specimen-qualified Oblea example. Ignored-and-hidden searches and pinned METPO review found no exact record. Reserved METPO:1058500 in v508. Preserved partial-enclosure scope, source access limits and unresolved membrane topology; deferred unsupported protein mechanisms and sequence inference.