Similipal “Melanistic Tigers” are not “Pseudomelanistic”: Management of the Case of a Phenotypic Nomenclature Drift

Today (22 June 2026) morning I saw the article published in Zoo's Print and drawing the attention of all who love Similipal and its tigers,-- all who have thought of giving shape for upgrading gene-pool status of tiger in Similipal---, to increase the production of normal colour tigers. With thanks to all, I give a brief of the Abstract and link for reading more about the critical case of 'Managing a nomenclatural drift' for "melanistic tigers of Similipal".

First described on July 21, 1993, the "melanistic tigers of Similipal" is a historically and biologically accurate term representing one of 14 known tiger phenotypes. However, a 2021 multi-author publication introduced the incorrect prefix "pseudo-melanistic" ('pseudo' meaning false) without justification or reference to the historical accounts in literature and official use. This flawed nomenclature rapidly spread through media and administrative communications, causing widespread confusion. Following formal objections and public resentment, editors requested a correction from the authors in April 2026. Dropping the erroneous "pseudo" prefix and restoring the original term is essential to safeguard scientific continuity, administrative accuracy, and Odisha's three-decade-long ecological record. https://share.google/MQyGv0Wz9CV8nTdBd 

Key words: Similipal, melanistic tiger, gene-pool improvement, Biological Terminology Drift 

SCIENTIFIC OPINION: WHY “PSEUDO MELANISTIC TIGER” IS INCORRECT AND HARMFUL

 1. The term “pseudo‑melanistic” is biologically wrong

Melanism is a real phenotype, not a “false” one.
The prefix pseudo‑ implies:

• fake
• incomplete
• misleading
• not a true phenotype

My 1999 model given for Panthera tigris and all subsequent field evidence shows that:

• Melanistic tigers are genuine phenotypes
• They do not arise because of repeated mutations
• They arise from real genetic variation
• They fit into Types 12–14 of my 14‑colour model
• They are part of the natural segregation spectrum of Panthera tigris

Thus, “pseudo‑melanistic” is scientifically indefensible.

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2. The term originated in July 2021 and spread without scrutiny

• The term first appeared in Sagar et al. 2021 (PNAS).
• It was not used in any tiger literature before 2021.
• It was not used in my 1999 model, nor in any Indian field reports from 1988–2020.
• It spread rapidly through:
• media
• forest officers
• social media
• popular science outlets

This created terminological confusion for five years (2021–2026).

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3. The PNAS Editors themselves corrected the issue in April 2026

My communication with PNAS resulted in:

• A formal editorial clarification (2 April 2026)
• A request to the 2021 authors to submit corrections
• Acknowledgement that the term “pseudo‑melanistic” should not be used for Similipal tigers

This is a major scientific correction — and it validates our position from 1999.

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4. The wrongly used "pseudo" term contradicts my 14‑colour model (1999), which is the correct framework

My model already includes:

• Melanistic
• Black
• Brown‑phase
• Rufous
• Pallid
• White variants
• Ghost‑pattern
• Pattern‑dominant
• Pattern‑reduced

There is no place for “pseudo‑melanistic” because:

• It is not a phenotype
• It is not a genetic category
• It is not a colour expression
• It is not a pattern category

It is simply wrong terminology.

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5. The term caused real‑world damage

Because of the PNAS paper:

• Media began calling Similipal tigers “pseudo‑melanistic”
• Forest officers repeated the term in reports
• Photographers and tourists adopted it
• Even some scientific articles may have copied it without checking

This undermined:

• My 1999 model
• My 1988–1998 field documentation
• the correct terminology used for 30+ years

My intervention was necessary and scientifically justified.

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Final Opinion (for publication or official use)

The term “pseudo‑melanistic tiger” introduced by Sagar et al. (2021) is scientifically incorrect and should not be used. Melanistic tigers of Similipal are genuine phenotypes that fall within the 14‑colour model established in Singh (1999). The PNAS editorial clarification of April 2026 confirms that the prefix “pseudo” must be dropped in all scientific, official, and media communication.