Field notes
Encounter profile
Identified using .
Cyerce nigra - Cyerce species - A marine genus.
Species profile
Tiger Butterfly Sea Slug
Cyerce nigra
Identified using .
7
Media items
Photos and videos
3
Dives
Distinct encounters
1
Location
1 trip
Photographic identification review
3/7 exact media auditedShared reviewed hypothesis
Cyerce nigra
Probable assessment across 3 exact media items. The archive is currently filed as Cyerce nigra; a reviewed hypothesis is evidence, not a silent relabelling.
Archive ecology
Conditions where we found it
SNAP observations, not the species’ full biological range.
- Depth evidence
- 0.0–8.2m
- Median 3.6m · n=6
- Water temperature
- 25.0–25.0°C
- Median 25.0°C · n=7
Depth basis: 0 recorded, 6 profile-estimated, 1 contextual.
Consistent water window
7 observations with dive temperature sit within 25.0–25.0°C.
Recent encounters trend deeper
The recent-half median is 4.1m deeper than the earlier-half median. This is an archive pattern, not a population conclusion.
View distributions & comparisons▾
Indicative archive pattern · 7 observations / 3 dives
Observed depth distributionmiddle 50%: 2.7–6.5m
- • These distributions describe photographs in SNAP, not a species’ complete biological range.
- • Depth distributions use recorded or capture-time profile estimates; dive-average and maximum context is excluded.
- • Time-of-day groups use the camera clock and are not corrected for sunrise, sunset, or timezone.
Creature trail
A life through time and place
Species field guide
Notes, taxonomy, identification & seasonality
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Species field guide
Notes, taxonomy, identification & seasonality
Identification audit
Audit history for photographed encounters
6 assessments across 3 exact media items. Each records who reviewed the image, when, what they concluded, and why. These assessments remain separate from iNaturalist computer vision and from the current canonical Gallery label.
ProbableLatest audit record
Conclusion: Cyerce nigra
Reviewed by Codex identification research on Aug 29, 2026 · 97% reviewer confidence.
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
Evidence limits & sources +−
- • No specimen anatomy or DNA is available
- • The head pattern is less exposed than in the strongest companion stills
Show 1 earlier assessment +−
Earlier audit record
Conclusion: Cyerce nigra
Reviewed by Codex identification research on Aug 29, 2026 · 97% reviewer confidence.
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
Evidence limits & sources +−
- • No specimen anatomy or DNA is available
- • The head pattern is less exposed than in the strongest companion stills
ProbableLatest audit record
Conclusion: Cyerce nigra
Reviewed by Codex identification research on Aug 29, 2026 · 98% reviewer confidence.
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
Evidence limits & sources +−
- • No specimen anatomy or DNA is available
- • Photographic evidence supports probable rather than confirmed species identification
Show 1 earlier assessment +−
Earlier audit record
Conclusion: Cyerce nigra
Reviewed by Codex identification research on Aug 29, 2026 · 98% reviewer confidence.
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
Evidence limits & sources +−
- • No specimen anatomy or DNA is available
- • Photographic evidence supports probable rather than confirmed species identification
ProbableLatest audit record
Conclusion: Cyerce nigra
Reviewed by Codex identification research on Aug 29, 2026 · 98% reviewer confidence.
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
Evidence limits & sources +−
- • No specimen anatomy or DNA is available
- • Photographic evidence supports probable rather than confirmed species identification
Show 1 earlier assessment +−
Earlier audit record
Conclusion: Cyerce nigra
Reviewed by Codex identification research on Aug 29, 2026 · 98% reviewer confidence.
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
Evidence limits & sources +−
- • No specimen anatomy or DNA is available
- • Photographic evidence supports probable rather than confirmed species identification
Archive
All media records
7 media items
Optional context
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Life found nearby
Species photographed on the same dives come first, followed by close taxonomic neighbours.
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