Reasoning recorded at review

• •The animal is broad and oval with an ample, relatively low mantle skirt that widely overlaps the body.
• •The mantle edge forms a broad compound border with multiple purple-violet zones and a pale creamy transition, not a single fine line.
• •The cream-to-ochre dorsum carries predominantly separate solid dark violet-purple spots, each surrounded by a bright pale-blue, violet-white, or cream halo.
• •Pale cream-to-yellow rhinophores and a large pale gill circlet are compatible supporting characters.
• •Despite darker exposure, the complete broad body, compound purple border, separate pale-ringed spots, and pale appendages are visible.

Alternatives considered

• Goniobranchus leopardus

  Why plausible: A member of the same colour group with an ochre ground, purple marks, and a purple edge.

  Comparison: G. leopardus should show only a fine purple edge and smaller marks more often organized into hollow rings or multi-spot leopard patterns; neither combination is visible here.

• Hypselodoris tryoni

  Why plausible: Shares solid dark marks with pale halos and colour-group similarity.

  Comparison: H. tryoni should be high, elongate, and narrow with reduced mantle overlap and only a fine violet edge, contrary to the broad low multi-banded mantle visible here.

• Goniobranchus geminus / Goniobranchus tritos

  Why plausible: Indian Ocean colour-group analogues can share a broad chromodorid body and haloed dorsal spots.

  Comparison: A specimen-backed comparison of the full marginal band order and internal anatomy or molecular data would be required; locality is supporting context only and is not used to exclude them by itself.