Reasoning recorded at review

• •Broad flattened fan-shaped cerata are visible from several angles
• •The black outward ceratal faces carry numerous discrete round orange-yellow spots
• •The opposite faces show repeated horizontal dark striations separated by pale to faint green-white lines
• •A light orange-yellow infra-marginal band and narrow dark outer margin repeat across many cerata
• •Long pointed rhinophores retain the longitudinal dark and orange-pale pattern

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