Alex Mustard / Pygmy squid (Idiosepius sp.) swimming. Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Sea.

Alex Mustard / Pygmy squid (Idiosepius sp.) pair sheltering under a piece of coral at night. Yillet Kecil, Yillet Islands, Misool, Raja Ampat, West Papua, Indonesia. Tropical West Pacific Ocean. Ceram Sea.

Alex Mustard / Tiny, nocturnal, undescribed species of pygmy squid (Idiosepius) swimming between the branches of a seafan. Misool, Raja Ampat, West Papua, Indonesia. Ceram Sea, Tropical West Pacific Ocean.

Jeff Rotman / Southern pygmy squids (Idiosepius notoides) schooling at night, Sydney, Australia, Pacific

Fred Bavendam / Two-tone Pygmy Squid (Idiosepius pygmaeus), Lembeh Strait, Indonesia

Alex Mustard / Pygmy squid (Idiosepius sp.) camouflaged next to a piece of algae, North Sulawesi, Indonesia, Lembeh Strait.

Alex Mustard / Pygmy squid (Idiosepius sp.) and larval fish investigating a discarded plastic wrapper drifting in the ocean, Bitung, North Sulawesi, Lembeh Strait, Molucca Sea.

Jacob Guy / Pygmy squid (Idiosepius pygmaeus) resting on plant, Lembeh Strait, Indonesia.

Tony Wu / Female Northern pygmy squid (Idiosepius paradoxus) depositing eggs on a blade of eelgrass (Zostera marina), next to a white mass of eggs laid previously, Yamaguchi Prefecture, Japan.

Tony Wu / Female Northern pygmy squid (Idiosepius paradoxus) depositing eggs on a blade of eelgrass (Zostera marina), Yamaguchi Prefecture, Japan.

Tony Wu / Northern pygmy squid (Idiosepius paradoxus) eggs on a blade of eelgrass (Zostera marina), Yamaguchi Prefecture, Japan.

Tony Wu / Northern pygmy squid (Idiosepius paradoxus) consuming an amphipod crustacean, Yamaguchi Prefecture, Japan.