Reasoning recorded at review

• •Multiple broad flattened fan-shaped cerata are visible in the full frame
• •Several outward-facing cerata are semi-translucent black with scattered round elevated orange-yellow spots
• •Several opposite ceratal faces carry dense repeated horizontal dark striations separated by minute pale lines
• •The cerata show a light orange-yellow infra-marginal band with a narrow dark outer edge
• •Long pointed rhinophores show longitudinal dark and orange-pale 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