Phylum Logistica

The Phylum Logistica is the classification under which the Tower catalogues the movement, routing, custody, and eventual delivery of objects between floors, and the personnel and apparatus that perform it. It is not a phylum of organisms. The name was assigned provisionally by the Grand Taxonomy in the belief that logistics was a biological kingdom; the error was detected within four years and has never been corrected, on the grounds that correcting it would require reopening the phylum's boundary schedules.

The Logistica presently contains some two hundred and sixty described classes, of which roughly half describe crates. It is administered jointly by the Department of Speculative Biology, which retains nominative authority, and the Office of Vertical Transit, which retains operational authority and has not spoken to the Department since the Fifth Reconciliation.

Origin and the naming error

The phylum was erected under Grand Taxonomy Annotated Schedule 9 (rev. 2), which appended a short list of categories that survey teams had reported but could not place. A surveyor of the Third Lower Expedition submitted the entry "things that arrive," accompanied by a note describing a pallet that had reached her floor without any record of having left the floor above. The schedule committee read the note as a description of feeding behaviour and admitted the entry at phylum rank.

Schedule 9 (rev. 2) is no longer in force, but its rank assignment survives in every subsequent edition. The Vorn Criterion would ordinarily have demanded demotion; the Criterion's own author declined to rule, writing that the matter was "operationally intelligible and taxonomically embarrassing, which is the usual condition of both disciplines."

Structure of the phylum

The Logistica is divided into four subphyla, arranged by the distance over which a movement is authenticated:

The fourth subphylum was created in 641 by Ordinance 641-C and has grown faster than the other three combined. Its contents are catalogued but not traced. See Implied Fauna for the parallel treatment of animals whose presence is inferred from damage.

Diagnostic features

A specimen is admitted to the Logistica if it satisfies three conditions: it occupies volume, it has changed floor at least once within the record, and its change of floor is attested by at least one witness who is not the specimen. The third condition excludes the Living Stone, which has changed floors twice and which no one has agreed to call a witness.

The nomenclatural dispute

Two Concordances govern the naming of Logistica classes and disagree completely.

"A class shall be named for the object moved, in the genitive, followed by the designation of the route."

Second Concordance, clause 14.3

"A class shall be named for the route, in the nominative, and the object shall be recorded as a specimen attribute."

Eighth Concordance, clause 2.1

The Second has been in force continuously since 388. The Eighth was ratified in 604 and has never been repealed. The resulting catalogue carries both names for most classes above the rank of family, printed in parallel columns under a typographic convention described in the Schedule of Duplicated Headings as "the lesser evil."

Librarian Kael has argued in three separate memoranda that the Eighth is a schedule rather than a Concordance and therefore cannot bind nomenclature. The Office of Concordance Review has declined to rule, noting that the question was referred to it in 606, 617, and 639, and that each referral was withdrawn before determination.

Relationship to the faunal taxonomies

The Logistica is one of two phyla whose members are permitted to move between holdings. The other is Archival Fauna, whose specimens move themselves and are therefore catalogued as fauna, while Logistica specimens are moved and catalogued as freight. This distinction is maintained despite frequent violation: Archival Mites are fauna that travel in crates, and are accordingly recorded twice, once under each phylum, in ledgers that are never reconciled.

The Desk Fern Taxonomy, which accepts Pteridophyta annexa as its sole phylum, contains a footnote acknowledging the Logistica and describing it as "outside the present scope." Indexing Moths have been observed in the phylum's storage bays; no class has been erected for them, and the omission is considered settled.

Known classes

• Logistica palletifera — the standard four-foot pallet, the most numerous described class.
• Logistica palletifera var. sine littera — a pallet bearing no stencil, of uncertain parentage.
• Logistica uncatalogata — any consignment whose manifest contradicts its contents; includes the Discrepant Crate.
• Logistica redituens — freight that returns to its floor of origin without a recorded outbound movement; the type specimen has returned eleven times.
• Logistica vacua — an empty container whose weight exceeds its capacity, treated as freight rather than as evidence of Implied Fauna.

Class assignments above the rank of family are provisional pending resolution of the naming dispute and are marked in the catalogue with a spiral aperture symbol, per Aperture Marking Convention 12.

Open questions

The phylum's outstanding difficulty is the status of the Unattributed Pallet, an object that has been recorded on forty-one floors, never in transit, and never in the same place twice within a single survey. Whether it constitutes a single specimen, a class, or evidence of Conjectural Mapping remains undetermined. The Department of Speculative Biology has assigned it a holding number and no name, which is the closest the Department comes to an admission.