Sea star shimp (Periclimenes soror), on a crown-of-thorns starfish (Acanthaster planci), Yap, Micronesia, Pacific

Bubble coral shrimp (Vir philippinensis) on bubble coral (Plerogyra sp.), Philippines, Southeast Asia, Asia

A blackspotted puffer (Arothron nigropunctatus) curled up on the reef for the night, Philippines, Southeast Asia, Asia

A sea star shimp (Periclimenes soror), swims through a forest of spines on the back of a crown-of-thorns starfish, Micronesia, Pacific

Anemone shrimp (Periclimenes holthuisi) in the tentacles of its host anemome, Queensland, Australia, Pacific

Anker's whip coral shrimp, Cebu, Philippines.

Crinoid shrimp, Cebu, Philippines.

Two nudibranchs with two emperor shrimp riding on their backs, Tulamben, Bali, Indonesia.

Bubble coral shrimp, Anilao, Philippines.

Emperor shrimp (Periclimenes imperator) on a sea cucumber, Anilao, Philippines.

Black finned snake eel (Ophictus Melanochir) with short hand commensal shrimp (Palaemonidae). Lembeh Straits, Indonesia. (RR)

Vermillion seabass (Cephalopholis miniata) with cleaner shrimp (Urocaridella antonbruunii), Pacific, Indian Ocean, Red Sea

A Harlequin Shrimp (Hymenocera elegans) holding part of a blue seastar (Linkia laevigata) which it will feed on, Philippines

Anemone shrimp, Ancylomenes sarasvati, previously known as Periclemenes sarasvati, Dumaguete, Philippines

The Bubble Coral Shrimp (Vir philippinensis) is found only on this species of coral, Pleurogyra sinuosa. The brown oval objects are actually Acoel Flatworms (Waminoa sp) that feed on nutrients trapped in mucus covering the coral, Philippines

A transparent shrimp, Periclemenes sp, on an anemone (Heteractis magnifica). Some are so clear the only thing visible is the black of their eyes, Tubbataha Reef, Philippines

Couple of Imperial Shrimp (Periclimenes imperator) on a blue sea cucumber (Actinopyga caerulea) 76 meters deep, Mayotte

Imperial Shrimp (Periclimenes imperator) on a blue sea cucumber (Actinopyga caerulea) 76 meters deep, Mayotte

Imperial shrimp (Periclimenes imperator) hidden under a Sea cucumber, Mayotte