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Species profile

Black-margined sea slug

Elysia expansa

Identified using .

3
Media items
Photos and videos
2
Dives
Distinct encounters
2
Locations
Where seen
View all 3 media items ↓

Archive ecology

Conditions where we found it

SNAP observations, not the species’ full biological range.

Depth evidence
6.0–6.0m
Median 6.0m · n=1

Depth basis: 1 recorded, 0 profile-estimated.

An early signal

1 environment-linked observation is available so far. More encounters will show whether a repeatable pattern emerges.

View distributions & comparisons▾

Indicative archive pattern · 3 observations / 2 dives

Observed depth distributionmiddle 50%: 6.0–6.0m
5–10m
  • • 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.
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Creature trail

A life through time and place

2 encounters

  1. #2 · Oct 18, 2025

    Blairgowrie Marina

    Blairgowrie Marina

    6.0m · Recorded with media

  2. #1 · Oct 12, 2024

    Rye

    Rye

Species field guide

Notes, taxonomy, identification & seasonality

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Field notes

Encounter profile

Identified using .

Elysia expansa - Elysia is a genus of sea slugs, marine gastropod molluscs in the family Plakobranchidae. These animals are colorful sea slugs, and they can superficially resemble, but are not very closely related to them. Instead they are sacoglossans, commonly known as sap-sucking slugs.

Archive

All media records

3 media items

Optional context

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Life found nearby

Species photographed on the same dives come first, followed by close taxonomic neighbours.

Explore this group
crowned nudibranch1 shared dive
crowned nudibranch
Polycera capensis
Rye
Fleshy Doriopsilla1 shared dive
Fleshy Doriopsilla
Doriopsilla carneola
Rye
Haeckel's Jelly1 shared dive
Haeckel's Jelly
Pseudorhiza haeckeli
Blairgowrie Marina
Hedgpeth's Dorid1 shared dive
Hedgpeth's Dorid
Polycera hedgpethi
Rye
made-up phyllodesmium1 shared dive
made-up phyllodesmium
Phyllodesmium serratum
Blairgowrie Marina
Mosaic Leatherjacket1 shared dive
Mosaic Leatherjacket
Eubalichthys mosaicus
Blairgowrie Marina

Related context

Seen on

Blairgowrie Marina
Blairgowrie Marina / Oct 18, 2025
Rye
Rye / Oct 12, 2024 / 2 records