52 photos - 23 species


Costasiella kuroshimae Ichikawa, 1993

Kuro sap-sucking slug or Shaun the sheep nudibranch

Clutch of the Costasiella kuroshimae
Clutch of the Costasiella kuroshimae

 Maximum length: 3 - 7 mm

The body is cream-colored, has white spots and is transparent.

They have white rhinophores with black tips,

a white head and a dark stripe in front of the rhinophores.

Photos 1 - 2 Johnny: Bangka Island North Sulawesi


Costasiella usagi Ichikawa, 1993

Rabbit sap-sucking slug

Maximum length: 4 - 7 mm

The color varies from green to gray.

Their rhinophores always have black tips.

Photos 1 - 2 Johnny: Bangka Island North Sulawesi


Costasiella sp.

No english name yet

 Maximum length: ?

It is certainly a Costasiella, but an as yet unnamed one,

so I can't give a size, this one had max 5 mm.

It has white rhinophores with black tips.

Photos 1 - 3 Johnny: Bangka Island North - Sulawesi


Costasiella sp.

No english name yet

 Maximum length: ?

This Costasiella is still undescribed, there are still many to be discovered and named.

Photo 1 Johnny: Bangka Island North Sulawesi


Cyerce elegans ( Bergh, 1870 ) 

Butterfly cyerce nudibranch, Elegant cyerce

Maximum length: 4 cm

Maximum depth: 10 - 18 m

This sucker rightly deserves its name.

Their cushion-like, transparent cerata are yellowish, brownish or cream-colored.

The network of dots and lines may still be missing in juvenile animals.

This species mainly lives in habitats in which

Halimeda kanaloana and Halimeda idea grow algae,

on which they feed.

Predominantly nocturnal.

Photos 1 - 3 Johnny: Bangka island North Sulawesi


Cyerce nigra Bergh, 1871

No english name yet

 Maximum length: 15 mm

Orange with a series of black and white lines on the head and the rest of the body.

Photos 1 - 4 Johnny: Bangka Island North - Sulawesi


Cyerce sp.

No english name yet

 Maximum length: ? This one had max. 8 mm

It is certainly a Cyerce, but an as yet unnamed one, so I can't give a size,

this one had max 10 mm.

Photos 1 - 2 Johnny: Bangka Island North - Sulawesi 


Elysia asbecki Wägele, Stemmer, Burghardt & Händeler,  2010

No english name yet

 Maximum length: 20 mm

Greenish with pink markings on the side.

The rhinophores with yellowish rings.

Photos 1 - 2 Johnny: Bangka Island Indonesia


Elysia crispata Mörch, 1863

Blumenkohl - Sackzungenschnecke

Maximale Länge: 100 mm

Tiefe: 0 - 12 m

Zahlreiche faltige Rückenhautlappen, die an Blattsalat erinnern,

die Färbung geht von grün, blau, gelb bis rot.

Fotos 1 - 3 Johnny: Bonaire  Karibik


Elysia marginata Pease, 1871

Dark-margined sap-sucking slug

Maximum length: 50 mm

Variable colors, but always with black spots on the body and an orange border.

Photos 1 - 2 Johnny: Bangka Island North Sulawesi


Elysia pusilla ( Bergh, 1872 )

Halimeda sap - sucking slug, Flat Elysia

Maximum length: 0.5 - 1.5 cm (this was very small, compare fingernail with snail on photo 1)

Maximum depth: 1 - 12 m

Oval, flat transparent body with tiny rhinophores.

It has the same color as the algae on which it is found.

Photos 1 - 2 Johnny: Bangka Island North Sulawesi


Elysia sp.

no english designation

Maximum length: not known

Maximum depth: not known

A not yet described sapsucker.

We found this snail at a depth of about 10 m, it had a size of 10 mm

Photos 1 - 2 Johnny: Bangka island North Sulawesi


Elysia sp.

no english designation

Maximum length: not known

Maximum depth: not known

A not yet described sapsucker.

We found this snail at a depth of about 12 m, it had a size of 8 mm

Photos 1 - 2 Johnny: Bangka island North Sulawesi


Oxynoe kylei ( Krug, Berriman & A.Valdés, 2018 )

Supsucking slug, Tessellate Oxynoe

Maximum length: 0.8 cm

Maximum depth: 10 - 12 m

This species was only described in 2018, so far there is hardly any information available.

They feed on algae, mainly Halimeda algae, which they suck out.

Photo 1 Johnny: Bangka Island North Sulawesi


Plakobranchus ocellatus van Hasselt, 1824

Ocellate plakobranchus or Ringed sap-sucking slug

 Maximum length: 60 mm

Due to the chloroplasts of the algae they eat,

they are bright green under the folded side lobes. 

The coloration under the lateral lobes varies depending on what they eat.

Photo 1 Astrid: Moalboal Philippines

Photo 2 Johnny: Moalboal Philippines


Plakobranchus papua Meyers-Munoz & van der Velde, 2016

Papua sap-sucking slug

 Maximum length: 40 mm

Same description as: see one species above.

Photo 1 Astrid: Moalboal Philippines

Photos 2 - 4 Johnny: Moalboal Philippines


Stiliger sp.

No english name yet

 Maximum length: 8 mm

Unfortunately the pictures are not good.

It belongs to the species Stiliger but is unfortunately not yet described.

Photos 1- 2 Johnny: Banga Island North Sulawesi


Thuridilla albopustulosa ( Gosliner, 1995 )

White - spotted Thuridilla

Maximum length: 1.5 - 2.5 cm

Maximum depth: 27 m

White band running around the edge of the mantle.

White to cream-colored spots on the body, hence the name albopustolusa.

Rhinophores: White below, bright orange above.

Photos 1 - 2 Johnny: Bangka Island North Sulawesi


Thuridilla bayeri ( Er.Marcus, 1965 )

Painted thuridilla, Bayer's Thuridilla

Maximum length: 2 - 2.5 cm

Maximum depth: 12 m

It has a medium-sized smooth body.

The rhinophores are long, curled and have a blunt end.

Black to brown body, with 6 - 10 yellow to cream-colored longitudinal lines on the body and parapodia.

Six to seven egg-shaped, light blue spots along the parapodia.

The head itself may have a blue marking in the middle of the back.

Photos 1 - 2 Johnny: Bangka Island North Sulawesi 


Thuridilla carlsoni ( Gosliner, 1995 )

Carlson's Elysia, Sapsucking slug

Maximum length: 2 - 2.5 cm

Maximum depth: 15 m

It has a beige-colored body with green spots.

Cream-colored rhinophores with an orange tip.

Found on muddy and sandy bottoms.

Photo 1 Johnny: Bangka Island North Sulawesi


Thuridilla flavomaculata Gosliner, 1995

Yellow spotted Thuridilla

 Maximum length: 22 mm

This species has a greenish ground color with white and yellow spots.

The rhinophores are white with black and white tips.

It is the only one of this genus with scattered yellow spots.

Photos 1 - 2 Johnny: Bangka Island North Sulawesi


Thuridilla gracilis Risbec, 1928

Graceful thuridilla, Glazed thuridilla or Slender sap-sucker

 Maximum length: 25 mm

Greenish black body with white or cream-colored lines.

Rhinophores like the body with variable tips.

Photos 1 - 2 Johnny: Bangka Island North Sulawesi


Thuridilla lineolata Bergh, 1905

Orange-edged Sap-sucking slug or Lined thuridilla

 Maximum length: 30 mm

The body is bright light blue, the mantle has an orange border,

a dorsal stripe of the same color runs across the body.

The rhinophores are blue below and fade into an orange tone over a black bridge.

Photos 1 - 3 Johnny: Lembeh Strait North - Sulawesi