By species www.diverosa.com Rokus Groeneveld & Sanne Reijs  
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Cephalopods are the highest developed member of the mollusks; related to, for example, shells and nudibranch. The name Cephalopods comes from the Greek and means head / foot. The main members are octopus, squid and cuttlefish, but also the seldom seen nautilus and argonauts are part of it. There are over 800 different species, all marine; there are no fresh water species.

Cephalopods are often hard to determinate, also because most Cephalopods posses the ability to change color. They do that by their Chromatophores, pigment-containing and light-reflecting cells, also found in amphibians, fish, reptiles, crustaceans. Sometimes the flash of a strobe makes them change color instantly. Next to that, a lot of Cephalopods, especially squid and cuttlefish, also use bioluminescence produced by bacterial symbionts.
IL3-096 Two-tone pygmy squid, Idiosepius pygmaeus

Idiosepius pygmaeus

Two-tone pygmy squid

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

IAM-043 Two-tone pygmy squid, Idiosepius pygmaeus, with shrimp

Idiosepius pygmaeus

Two-tone pygmy squid

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

FNE-024 undetermined pygmy squid, Idiosepius sp. 1

Idiosepius sp.

undetermined pygmy squid

Negros, Philippines 2012
Dive site: house reef Atlantis (night dive)

FNE-234 undetermined pygmy squid, Idiosepius sp.

Idiosepius sp.

undetermined pygmy squid

Negros, Philippines 2012
Dive site: San Miguel (night dive)

FNE-235 undetermined pygmy squid, Idiosepius sp.

Idiosepius sp.

undetermined pygmy squid

Negros, Philippines 2012
Dive site: San Miguel (night dive)

FM2-039 undetermined pygmy squid, Idiosepius sp.

Idiosepius sp.

undetermined pygmy squid

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

IL5-058 undetermined pygmy squid, Idiosepius sp.

Idiosepius sp.

undetermined pygmy squid

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

IRA-308 undetermined pygmy squid, Idiosepius sp. with shrimp

Idiosepius sp.

undetermined pygmy squid

Indonesia, Raja ampat 2014
Dive site: Nudibranch rock

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IL1-23 Bigfin reef squid

Sepioteuthis lessoniana

Bigfin reef squid

Lembeh, Indonesia 2002
Dive site: Batu putih (night dive)

FCA-08 Bigfin reef squid

Sepioteuthis lessoniana

Bigfin reef squid

Cabilao, Philippines 2005
Dive site: Lighthouse (night dive)

FMI-079 Bigfin reef squid 1

Sepioteuthis lessoniana

Bigfin reef squid

Cebu, Philippines 2007
Dive site: Pescador south (night dive)

FMI-078  Bigfin reef squid 2

Sepioteuthis lessoniana

Bigfin reef squid

Cebu, Philippines 2007
Dive site: Pescador south (night dive)

IL3-156 Bigfin reef squid, Sepioteuthis lessoniana

Sepioteuthis lessoniana

Bigfin reef squid

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

IL3-157 Bigfin reef squid, Sepioteuthis lessoniana

Sepioteuthis lessoniana

Bigfin reef squid

Lembeh, Indonesia 2008
Dive site: Aw shucks

IL3-158 Bigfin reef squid, Sepioteuthis lessoniana

Sepioteuthis lessoniana

Bigfin reef squid

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

IL3-140 Bigfin reef squid, Sepioteuthis lessoniana

Sepioteuthis lessoniana

Bigfin reef squid

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

IAM-047 Bigfin reef squid, Sepioteuthis lessoniana 1

Sepioteuthis lessoniana

Bigfin reef squid

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

IAM-048 Bigfin reef squid, Sepioteuthis lessoniana 2

Sepioteuthis lessoniana

Bigfin reef squid

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

IAM-271 Bigfin reef squid, Sepioteuthis lessoniana 3

Sepioteuthis lessoniana

Bigfin reef squid

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

IL4-077 Bigfin reef squid, Sepioteuthis lessoniana

Sepiotheutis lessoniana

Bigfin reef squid

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

IL4-072 Bigfin reef squid, Sepioteuthis lessoniana

Sepioteuthis lessoniana

Bigfin reef squid

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

IB2-008 Bigfin reef squid, Sepioteuthis lessoniana 1

Sepioteuthis lessoniana

Bigfin reef squid

Bali, Indonesia 2011
Dive site: Seraya

IB2-009 Bigfin reef squid, Sepioteuthis lessoniana 2

Sepiotheutis lessoniana

Bigfin reef squid

Bali, Indonesia 2011
Dive site: Seraya

IB2-014 Bigfin reef squid, Sepioteuthis lessoniana 3

Sepiotheutis lessoniana

Bigfin reef squid

Bali, Indonesia 2011
Dive site: house reef Kubu Indah (night dive)

IB2-150 Bigfin reef squid, Sepioteuthis lessoniana

Sepioteuthis lessoniana

Bigfin reef squid

Bali, Indonesia 2011
Dive site: house reef Kubu Indah (night dive)

IL5-036 Bigfin reef squid, Sepioteuthis lessoniana

Sepiotheutis lessoniana

Bigfin reef squid

Lembeh, Indonesia 2014
Dive site: Horse shoe (night dive)

IH2-119 Bigfin reef squid, Sepioteuthis lessoniana 1

Sepioteuthis lessoniana

Bigfin reef squid

Halmahera, Indonesia 2014
Dive site: Airstrip (night dive)

IH2-120 Bigfin reef squid, Sepioteuthis lessoniana 2

Sepioteuthis lessoniana

Bigfin reef squid

Halmahera, Indonesia 2014
Dive site: Airstrip (night dive)

FAN-019 Sepioteuthis lessoniana, Bigfin reef squid

Sepioteuthis lessoniana

Bigfin reef squid

Anilao, the Philippines 2015
Dive site: Koala (night dive)

BON-038 Caribbean reef squid, Sepioteuthis sepioidea

Sepioteuthis sepioidea

Caribbean reef squid

Caribbean, Bonaire 2013
Dive site: Salt city

BON-139 Caribbean reef squid, Sepioteuthis sepioidea 2

Sepioteuthis sepioidea

Caribbean reef squid

Caribbean, Bonaire 2013
Dive site: Salt city

/BON-140 Caribbean reef squid, Sepioteuthis sepioidea 3

Sepioteuthis sepioidea

Caribbean reef squid

Caribbean, Bonaire 2013
Dive site: Salt city

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IRA-189 undetermined flying squid, family ommastrephidae

family ommastrephidae

undetermined flying squid

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