Ascidiophilla alba

on ascidian Didemnum molle

Cebu, the Philippines 2007
house reef Magic Island (night dive)

Ascidiophilla alba

on ascidian Didemnum molle

Cebu, the Philippines 2012
house reef Magic Island (night dive)

Ascidiophilla alba

with undetermined amphipod

Bali, Indonesia 2016
Tulamben, house reef Ocean view (nd.)

Ascidiophilla alba

?

Bali, Indonesia 2016
Tulamben, house reef Ocean view (nd.)

Ascidiophilla alba

?

Romblon, the Philippines 2017
Dive site: Anchor bay

Cycloporus venetus

?

Lembeh, Indonesia 2022
Dive site: Monument (night dive)

Cycloporus cf. venetus

(on Nephtheis fascicularis)

manado bay, Indonesia 2022
Dive site: Circus critter 2 (night dive)

Cycloporus cf. venetus

?

Manado Bay, Indonesia 2022
Dive site: Catamaran

Maritigrella fuscopunctatus

Dusky spotted flatworm

Western Australia 2020
Dive site: Rockingham wreck trail

Maritigrella virgulata

?

Halmahera, Indonesia 2014
Dive site: Mangrove

Maritigrella virgulata

?

Bali, Indonesia 2016
Menjangan, Mimpi chanel (night dive)

Prostheceraeus fuscolineatus

?

Romblon, the Philippines 2017
Dive site: Suwa

family Euryleptidae

?

Lembeh, Indonesia 2008
Dive site: Teluk kembahu II (night dive)

Eurylepta sp.

Polkadot flatworm

Lembeh, Indonesia 2010
Dive site: Kapal indah

Eurylepta sp.

Polkadot flatworm

Lembeh, Indonesia 2022
Dive site: Nudi falls

Eurylepta sp.

Polkadot flatworm

Lembeh, Indonesia 2022
Dive site: Nudi falls

family Euryleptidae

?

Lembeh, Indonesia 2010
Dive site: Kapal indah

family Euryleptidae

?

Lembeh, Indonesia 2014
Dive site: Pulau abadir

family Euryleptidae

?

Raja ampat, Indonesia 2014
Dive site: Friwenbonda

family Euryleptidae

?

Bali, Indonesia 2016
Dive site: Seraya

family Euryleptidae

undetermined flatworm

Romblon, the Philippines 2017
Dive site: Bangug talisay

Acanthozoon alderi

?

Ambon, Indonesia 2010
house reef Maluku divers (night dive)

Acanthozoon alderi

?

Cebu, the Philippines 2012
house reef Magic Island (night dive)

Acanthozoon alderi

?

Halmahera, Indonesia 2014
Dive site: Tanjung uli

Acanthozoon alderi

?

Halmahera, Indonesia 2014
Dive site: Pasir putih

Acanthozoon alderi

?

Romblon, the Philippines 2017
Dive site: Bon bon (night dive)

Maiazoon orsaki

Red and black edged white flatworm

Halmahera, Indonesia 2010
Dive site: Shark reef

Maiazoon orsaki

Red and black edged white flatworm

Cebu, the Philippines 2012
Dive site: Fish feeding

Maiazoon orsaki

Red and black edged white flatworm

Raja ampat, Indonesia 2014
Dive site: Otdima

Nymphozoon bayeri

?

Anda, the Philippines 2018
house reef Magic Oceans (night dive)

probably Phrikoceros baibaiye

Vermilion flatworm

Bali, Indonesia 2016
Dive site: Secret bay (night dive)

Phrikoceros baibaiye

Vermilion flatworm

Australia, New South Wales 2023
Dive site: Clifton gardens (night dive)

Phrikoceros katoi

?

Negros, the Philippines 2019
Dive site: Orica pier

Phrikoceros katoi

?

Anilao, the Philippines 2023
Dive site: El pinoy (night dive)

Phrikoceros lizardensis

Olive flatworm

Bali, Indonesia 2016
Dive site: Seraya slope (night dive)

mayby Phrikoceros lizardensis

Olive flatworm

Negros, Philippines 2019
Dive site: Sahara (night dive)

Phrikoceros lizardensis

Olive flatworm

Anilao, the Philippines 2023
Dive site: Secret bay (night dive)

probably Pseudobiceros apricus

?

Lembeh, Indonesia 2008
Dive site: Air prang (night dive)

Pseudobiceros apricus

?

Lembeh, Indonesia 2022
Dive site: Air prang (night dive)

Pseudobiceros bedfordi

Elegant flatworm

Kapalai, Malaysia 2003
Dive site: Midreef

Pseudobiceros bedfordi

swimming Elegant flatworm

Gili islands, Lombok, Indonesia 2009
Stingray, Gili Trawangan (night dive)

Pseudobiceros bedfordi

Elegant flatworm

Halmahera, Indonesia 2010
house reef Weda resort (night dive)

Pseudobiceros ferrugineus

(half) Fuchsia flatworm

Anda, the Philippines 2018
Dive site: Bacong east

Pseudobiceros ferrugineus

Fuchsia flatworm

Philippines, Anda 2018
Dive site: Bacong west

Pseudobiceros ferrugineus

Fuchsia flatworm, juvenile

Philippines, Anda 2018
Dive site: Lamanok Island

Pseudobiceros flowersi

Flower’s flatworm

Lembeh, Indonesia 2008
Dive site: Air prang (night dive)

Pseudobiceros flowersi

Flower’s flatworm

Lembeh, Indonesia 2010
Dive site: Jarijari (night dive)

Pseudobiceros flowersi

swimming Flower’s flatworm

Lembeh, Indonesia 2010
Dive site: Jarijari (night dive)

Pseudobiceros flowersi

feeding on Atriolum robustum

Lembeh, Indonesia 2014
Dive site: Jahir (night dive)

Pseudobiceros flowersi

Flower’s flatworm

Lembeh, Indonesia 2014
Dive site: Jahir (night dive)

Pseudobiceros flowersi

feeding on Atriolum robustum

Negros, Philippines 2019
Dive site: Malatapay (night dive)

Pseudobiceros fulgor

?

Bangka, Indonesia 2017
house reef Mimpi Indah (night dive)

Pseudobiceros gloriosus

Glorious flatworm

Lembeh, Indonesia 2014
Dive site: Kuda laut

Pseudobiceros gratus

?

Manado Bay, Indonesia 2022
Dive site: Circus critter 2 (night dive)

Pseudobiceros hancockanus

?

Cebu, the Philippines 2012
house reef Magic Island (night dive)

Pseudobiceros hancockanus

?

Negros, Philippines 2019
Dive site: Malatapay (night dive)

Pseudobiceros kryptos

Camouflaged flatworm

Cebu, the Philippines 2007
house reef Magic Island (night dive)

Pseudobiceros kryptos

Camouflaged flatworm

Cebu, the Philippines 2007
house reef Magic Island (night dive)

Pseudobiceros sharroni

?

Romblon, the Philippines 2017
Dive site: Bangug 3 (night dive)

Pseudobiceros sp.

undetermined flatworm

Philippines, Anda 2018
Dive site: Secret place (night dive)

Pseudoceros bolool

?

Australia, New South Wales 2023
Dive site: Clifton gardens (night dive)

Pseudoceros bimarginatus

?

Bali, Indonesia 2016
Menjangan, Mimpi chanel (night dive)

Pseudoceros caeruleocinctus

?

Anilao, the Philippines 2023
Dive site: Daryl laut

Pseudoceros concinnus

Elegant striped flatworm

Raja ampat, Indonesia 2014
Dive site: The passage

Pseudoceros cf. contrarius

?

Romblon, the Philippines 2017
Dive site: Broken house

Pseudoceros dimidiatus

Thysanozoon nigropapillosum

Kapalai, Malaysia 2003
Dive site: Midreef

Pseudoceros dimidiatus

Divided flatworm or Tiger flatworm

Halmahera, Indonesia 2014
Dive site: Elmo's reef

Pseudoceros dimidiatus

Divided flatworm or Tiger flatworm

Bali, Indonesia 2016
Diver site: Menjangan, Eel garden

Pseudoceros duplicinctus

?

Lembeh, Indonesia 2010
Dive site: Teluk kembahu II

Pseudoceros duplicinctus

?

Bali, Indonesia 2016
Dive site: Seraya slope

Pseudoceros duplicinctus

?

Romblon, the Philippines 2017
Dive site: Bon bon (night dive)

Pseudoceros goslineri

?

Marsa alam, Egypt 2012
Dive site: house reef Oasis (night dive)

Pseudoceros goslineri

?

Raja ampat, Indonesia 2014
Dive site: The passage

Pseudoceros gravieri

?

Anilao, the Philippines 2023
Dive site: Daryl laut

Pseudoceros indicus

?

Manado Bay, Indonesia 2022
Dive site: Circus critter 3 (night dive)

Pseudoceros laingensis

Purple-spotted yellow flatworm

Negros, the Philippines 2012
Dive site: Siquijor, Paliton (sanctuary)

Pseudoceros laingensis

Purple-spotted yellow flatworm

Raja ampat, Indonesia 2014
Dive site: Mike's point

Pseudoceros laingensis

Purple-spotted yellow flatworm

Raja ampat, Indonesia 2014
Dive site: Otdima

Pseudoceros laingensis

Purple-spotted yellow flatworm

Romblon, the Philippines 2023
Dive site: Logbon cave

Pseudoceros lindae

?

Raja ampat, Indonesia 2014
Dive site: house reef Sorido (night dive)

Pseudoceros lindae

?

Bali, Indonesia 2016
Dive site: Menjangan, Blue corner

Pseudoceros lindae

?

Bangka, Indonesia 2017
Dive site: Batu Lihunu

Pseudoceros liparus

Racing stripe flatworm

Puerto Galera, Philippines 2005
Dive site: Sinadigan

Pseudoceros liparus

Racing stripe flatworm

Bali, Indonesia 2009
Dive site: Menjangan, Pos I

Pseudoceros liparus

Racing stripe flatworm

Bali, Indonesia 2009
Dive site: Menjangan, Pos I

Pseudoceros liparus

Racing stripe flatworm

Raja ampat, Indonesia 2014
Dive site: house reef Sorido (night dive)

Pseudoceros liparus

Racing stripe flatworm

Halmahera, Indonesia 2014
Dive site: Pasir putih

Pseudoceros liparus

Racing stripe flatworm

Bali, Indonesia 2016
Dive site: Menjangan, Blue corner

Pseudoceros liparus

Racing stripe flatworm

Manado Bay, Indonesia 2022
Dive site: Circus critter 2 (night dive)

Pseudoceros lividus

Blue flatworm

South Australia 2018
Dive site: Edithburgh jetty

Pseudoceros mossambicus

?

Romblon, the Philippines 2023
Dive site: Bonbon coconut

Pseudoceros cf. meenae

?

Bali, Indonesia 2011
Dive site: Tulamben, Drop off

Pseudoceros paralaticlavus

?

Lembeh, Indonesia 2008
Dive site: Tanduk rusa (night dive)

Pseudoceros paralaticlavus

Goldrim flatworm

Lembeh, Indonesia 2014
Dive site: Jari Jari

Pseudoceros rawlinsonae

?

Caribbean, Bonaire 2021
Dive site: Kalabas (night dive)

Pseudoceros cf. rubronanus

Red dwarf flatworm

Bali, Indonesia 2016
house reef Ocean view (night dive)

Pseudoceros cf. rubronanus

Red dwarf flatworm

Romblon, the Philippines 2017
Dive site: Bonbon broken coconut

Pseudoceros cf. rubronanus

Red dwarf flatworm

Cebu, the Philippines 2012
Dive site: Banlot (night dive)

Pseudoceros scintillatus

Brilliant flatworm (or Sparky pseudoceros)

Negros, the Philippines 2012
Dive site: Apo island, Largahan

Pseudoceros scintillatus

Brilliant flatworm (or Sparky pseudoceros)

Lembeh, Indonesia 2014
Dive site: Jahir

Pseudoceros scintillatus

Brilliant flatworm (or Sparky pseudoceros)

Anilao, the Philippines 2015
Dive site: Basura

Pseudoceros scintillatus

Brilliant flatworm (or Sparky pseudoceros)

Anilao, the Philippines 2015
Dive site: Secret bay

Pseudoceros scintillatus

Brilliant flatworm (or Sparky pseudoceros)

Anilao, the Philippines 2015
Dive site: Secret bay

Pseudoceros scintillatus

Brilliant flatworm (or Sparky pseudoceros)

Negros, Philippines 2019
Dive site: Secret corner

Pseudoceros scriptus

?

Negros, Philippines 2019
Dive site: Orica pier

Pseudoceros sp.

?

Raja ampat, Indonesia 2014
Dive site: The passage

Pseudoceros sp.

?

Raja ampat, Indonesia 2014
Dive site: The passage

Pseudoceros sp.

?

Anda, the Philippines 2018
Dive site: Bacong west

Thysanozoon brocchii

Carpet flatworm

Australia, New South Wales 2023
Dive site: Clovelly pool (night dive)

Thysanozoon nigropapillosum

Yellowspot flatworm

Hamata, Egypt 2007
Dive site: Shaab Hamam

Thysanozoon nigropapillosum

Yellowspot flatworm

Hamata, Egypt 2007
Dive site: Habili Claudia

Thysanozoon nigropapillosum

Yellowspot flatworm

Halmahera, Indonesia 2010
Dive site: New jetty (night dive)

Thysanozoon sp.

undetermined flatworm

Anilao, the Philippines 2015
Dive site: Secret garden

family Pseudocerotidae

Acanthozoon sp. or Thysanozoon sp.

Romblon, the Philippines 2017
Dive site: Bonbon talisay

family Pseudocerotidae

undetermined flatworm

Bali, Indonesia 2009
Dive site: Secret bay

family Pseudocerotidae

?

Australia, Victoria 2018
Dive site: Blairgowrie pier (night dive)

family Prosthiostomidae

undetermined flatworm

Western Australia 2020
Dive site: Bunker bay

undetermined flatworm

?

Australia, New South Wales 2023
Dive site: Nelson bay, Fly point

undetermined flatworm

(with Dendrodoris fumata)

Australia, New South Wales 2023
Dive site: Camp cove (night dive)

Echinoplana celerrima

?

Australia, Victoria 2018
Dive site: Flinders pier

Paraplanocera marginata

?

Lembeh, Indonesia 2022
Dive site: jahir (night dive)

Paraplanocera cf. marginata

?

Australia, New South Wales 2023
Dive site: Little Manley

Planocera pellucida

?

Romblon, the Philippines 2017
Dive site: Agnay desert (night dive)

Acotylean flatworm

undetermined

Bali, Indonesia 2016
Dive site: Seraya point

Acotylean flatworms

?

Lembeh, Indonesia 2022
Dive site: Tanduk rusa (night dive)

maybe Gnesiocerotid sp.

?

Anilao, the Philippines 2023
Dive site: Secret bay

cf. Amphiscolops sp.

Acoel flatworms

Halmahera, Indonesia 2010
Dive site: Shark reef

cf. Amphiscolops sp.

Acoel flatworm

Halmahera, Indonesia 2010
Dive site: Shark reef

cf. Amphiscolops sp.

Acoel flatworm

Halmahera, Indonesia 2014
Dive site: Mangrove

Waminoa brickneri

acoel flatworms on Plerogyra sinuosa

Cebu, the Philippines 2007
Dive site: house reef Magic Island

Waminoa brickneri

acoel flatworms on Plerogyra sinuosa

Cebu, the Philippines 2012
Dive site: house reef Magic Island

Waminoa brickneri

acoel flatworms on Plerogyra sinuosa

Bangka, Indonesia 2017
Dive site: Areng kambing 1

Waminoa brickneri

acoel flatworms on Plerogyra sinuosa

Bangka, Indonesia 2017
Dive site: Tanjung husi 3

probably Waminoa brickneri

on Dendronephthya sp.

Bali, Indonesia 2011
Dive site: Amed, Drop off

probably Waminoa brickneri

on Dendrophylliidae

Cebu, the Philippines 2012
Dive site: Arigay

probably Waminoa brickneri

?

Philippines, Anda 2018
Dive site: Birhen point

probably Waminoa brickneri

?

Lembeh, Indonesia 2022
Dive site: Tanjung kubur

Waminoa sp.

acoel flatworms

Halmahera, Indonesia 2010
Dive site: N 00.28.192 / E 127.58.668

Waminoa sp.

acoel flatworms

Halmahera, Indonesia 2014
Dive site: Tidore

Waminoa sp.

acoel flatworms

Lembeh, Indonesia 2022
Dive site: Pulau makawide

Waminoa sp.

acoel flatworms

Lembeh, Indonesia 2022
Dive site: Pulau makawide

Waminoa sp.

acoel flatworms

Anilao, the Philippines 2023
Dive site: Dapdap

undetermined acoel flatworms

on Echinaster callosus

Lembeh, Indonesia 2010
Dive site: Pulau serena