Reasoning recorded at review

• •The full-frame dorsal view exposes many broad flattened fan-shaped cerata
• •Several peripheral black ceratal faces show discrete round orange-yellow spots
• •Numerous inward-facing cerata show the repeated horizontal dark-and-pale striped pattern
• •The light orange-yellow infra-marginal band and narrow dark outer edge are repeated around the animal
• •At least one long pointed rhinophore shows longitudinal dark and pale-orange markings

Alternatives considered

• Cyerce nigricans

  Why plausible: A closely related black-and-orange species with spotted cerata and a pale-orange margin

  Comparison: The revision describes orange-yellow dots on both ceratal sides and different head/rhinophore markings, rather than C. nigra's spotted-versus-striped opposite faces

• Cyerce takanoi

  Why plausible: Another black-and-orange member of the revised complex that can resemble C. nigricans externally

  Comparison: It has two transverse orange head patches and scattered rhinophore-margin spots and does not supply the complete opposite-face pattern visible here

• Other black-and-yellow Cyerce

  Why plausible: The 2025 revision documents substantial cryptic and pseudocryptic diversity across the genus

  Comparison: Radula, reproductive anatomy and multilocus sequence evidence would provide confirmation