What's Inside
- The 2000 Clements Checklist Foundation
- Clements Checklist Organization Principles
- Passeriformes as the Largest Order
- Sources & References
The 2000 Clements Checklist Foundation
Why the 2000 date still governs the archive
The controlling date is 2000.
That is the year the 5th edition of the Clements Checklist entered service as the foundational taxonomic baseline for the bird stamp database. In practical catalog work, that date matters more than it first appears. It tells the cataloger which family sequence to expect, which scientific names belong to the original schema, and why some later stamp identifications need cross-checking before they settle into the species catalog.
Chris Gibbins created the database page on 5 July 2000, after the initial schema work ran between July 1 and July 5. That short deployment window left a visible methodological fingerprint: the database follows the checklist closely, rather than rebuilding avian classification from a later interpretive model. The result is not merely a list of birds on stamps. It is a taxonomic filing system built around a specific ornithological book at a specific moment.
The database architects selected Clements over the competing Peters and Howard and Moore lists because Clements aligned more cleanly with contemporary North American biological usage at the time. For stamp cataloging, that choice brought a useful discipline. Country issues could be entered under recognized species names, wwf issues could be matched to their stated taxa, and identification guides could point back to a consistent family placement.
Main Point: The 2000 Clements Checklist is best treated as the archive's filing rule, not as a claim that every later taxonomic revision must be ignored.
That distinction prevents many cataloging errors. A stamp may carry a current name, a local common name, or a name printed under an older authority. The Clements baseline gives the cataloger a stable place to put the record first. Verification can then address whether the printed bird, the depicted bird, and the biological species concept all point to the same entry.
Clements Checklist Organization Principles
How family numbers carry the taxonomic sequence
A taxonomic checklist works by hierarchy before it works by search. Orders contain families. Families contain genera. Genera contain species. The Clements-based database preserves that logic through sequential integer family identifiers, beginning with family 1, Struthionidae, and continuing through family 203.
Catalogers mapped the linear sequence of the printed checklist directly into the database schema. This was a conservative decision, and a useful one. Instead of asking each later contributor to decide where a bird belongs, the schema gives each family a fixed index. That index functions like a shelf mark in an archive.
- Family 1 begins with Struthionidae.
- Families continue in the same broad order used by the 2000 Clements edition.
- Order Passeriformes begins at family 105 with Eurylaimidae.
- The sequence extends through family 203.
This numbering is especially valuable when worldwide stamp depictions enter the same catalog. A postal issue from Africa, a country issue from Europe, and a wwf issue from an island administration may all depict birds that sit far apart in geography but near each other in taxonomic sequence. The family index gives those records a common route into the archive.
Where the method needs manual attention
The method is archival rather than molecular. Post-2000 ornithological updates have reshuffled some family boundaries, and recently split species may not fit the original index without deliberate cross-referencing. Applying the 2000 Clements numbering to stamps issued after 2015 often produces orphaned taxa because newly recognized families were not present in the original index.
Caution: When a recent addition names a split species, do not force the entry into the nearest old family without recording the modern taxonomic issue. That shortcut makes later verification harder.
Stamp cataloging conventions add another layer. Some postal authorities group species by local habitat rather than strict Clements taxonomic sequence. Wetland birds may appear together on the sheet even when the checklist places them in separate orders. The stamp arrangement is evidence about the issue design, not necessarily evidence about biological classification.
In field use, the cleanest procedure is to enter the record under the Clements family index, preserve the issuing-country description, and add a verification note when the modern name diverges. That keeps the species catalog searchable without erasing the stamp's original wording.
Passeriformes as the Largest Order
Why family 105 is a practical threshold
Family 105 is the hinge point.
In the 2000 Clements family index, Passeriformes begins precisely at family 105 with Eurylaimidae and runs through family 203. For a bird stamp archive, that boundary has unusual practical weight. Songbirds and their relatives generate dense stamp coverage, especially in country issues built around national fauna, conservation themes, and illustrated definitive sets.
The administrators therefore segmented the Passeriformes order into a distinct sub-directory. The reason was operational: loading the full volume of songbird stamp records could strain ordinary browsing. Query processing for the Passeriformes index runs to roughly a few seconds because the record density is high.
That range is not just a technical note. It explains why taxonomic navigation should not be treated as decoration. When a researcher searches for a specific species visual, the archive must narrow the path quickly: order, family, genus, species, then stamp issue. If the family placement is vague, the user loses time before reaching the image evidence.
Taxonomic navigation versus issue-based browsing
There are two legitimate ways to approach a bird stamp record. Issue-based browsing starts with the postal object: country, year, denomination, series title, and catalog reference. Taxonomic browsing starts with the organism: order, family, genus, species, and identification status.
Issue-based browsing works well when the researcher already knows the stamp. A collector holding a particular country issue can move from the stamp to the bird. Taxonomic browsing works better when the researcher needs all known depictions of a species, or when a visual comparison is needed across different countries.
Passeriformes exposes the difference sharply. A single songbird family may include many stamp records scattered across issuing authorities. If the archive only follows issue order, the species trail breaks apart. If it only follows taxonomy, philatelic context weakens. The Clements family index gives the biological route, while country issues and catalog references preserve the postal route.
Expert Tip: For Passeriformes records, verify the family number before comparing stamp artwork. Similar poses, perches, and color treatments can make unrelated songbirds look closer than their taxonomy allows.
This is where identification guides earn their place. They should not replace the checklist, but they can test the stamp image against field marks. A printed name may say one thing; the engraving or illustration may suggest another. The family index keeps the investigation ordered while the visual evidence is reviewed.
