17, 18, or 19?

2022: one Antillean mango became several species

The American Ornithological Society update separated populations once grouped as Antillean Mango. The archipelago's population became Puerto Rican Mango, Anthracothorax aurulentus, a full endemic species.

The decision did not invent a population or change its plumage overnight. It reinterpreted evidence of differentiation and moved a taxonomic boundary. A checklist closed before that decision will legitimately retain the previous total.

2023: Puerto Rican Euphonia gained separate recognition

The 2023 supplement recognized several Caribbean splits, including Chlorophonia sclateri. Puerto Rico's population was no longer hidden inside a broader Antillean euphonia and added another species to the endemic set.

Not every global authority adopts a split at the same time. It is better to name the checklist being followed—AOS, eBird/Clements, IOC, or another—than to use “official” as though one worldwide taxonomic calendar existed.

Endemic subspecies are a different count

Puerto Rico also has endemic populations classified below the species level. Adding them to an answer about “endemic birds” without explanation mixes two taxonomic units and creates another total that cannot be compared directly.

Greater Antillean Grackle shows why precision matters: the species occurs elsewhere in the Greater Antilles even though Puerto Rico's population may be treated as a distinctive local subspecies. This guide's total of 19 counts full species only.

How to cite the number without freezing it

For a webpage, class, or publication, a durable formulation is: “19 living endemic species under the taxonomy adopted by this atlas, reviewed July 20, 2026.” That sentence supplies the figure, scope, and date instead of pretending permanence.

When comparing sources, preserve both numbers and explain the change. The discrepancy is valuable information because it shows how science revises hypotheses about relationships, ranges, and names.

Is 17 wrong, then?

Not necessarily. It can describe a checklist that predates the 2022 and 2023 splits. It becomes misleading only when published without a date or authority as though universal and permanent.

Which two species explain the recent increase?

Puerto Rican Mango was recognized after the Antillean Mango split, and Puerto Rican Euphonia after the Antillean euphonia complex was split.

Can the total change again?

Yes. New genetic, vocal, morphological, or biogeographic evidence can support future splits or lumps, which is why the atlas displays a review date.