Invertebrates
Skeleton Shrimp
Caprellidae · also called skeleton shrimps, ghost shrimp
A skeleton shrimp clings to a strand of seaweed with its rear legs, holding its stick-thin body upright and swaying gently, mantis-like grasping front legs poised and ready. Should a prey item drift too close, those front legs snap shut in an instant, a whole hunting style built around a body so thin it barely looks like it has any soft tissue at all.
Overview
Skeleton shrimp, family Caprellidae, are elongated, stick-shaped crustaceans found clinging to seaweed, hydroids, and other structure in shallow coastal waters worldwide. Rear legs anchor the body while enlarged, hooked front legs snap forward to seize passing prey.
Camouflage built into the body plan
The extremely thin body and often mottled, translucent colouration let a skeleton shrimp disappear among similarly thin seaweed and hydroid branches, a combination of shape and stillness that makes it genuinely easy to overlook even at close range.
Status
Least Concern — common and widespread across coastal marine habitats worldwide, secure thanks to a broad diet and relatively fast reproduction.
Skeleton Shrimp: common questions
Why is it called a skeleton shrimp?
The name refers to the animal's extremely thin, elongated, stick-like body, which has relatively little visible soft tissue and gives the overall impression of a bony or skeletal framework rather than a typical fleshier crustacean body, an appearance reinforced by the animal's habit of clinging motionless to similarly thin strands of seaweed or hydroid branches.
Why do skeleton shrimp remind people of praying mantises?
A skeleton shrimp typically holds its thin body upright while gripping a strand of seaweed or hydroid with its rear legs, swaying gently and keeping its enlarged, hooked front legs poised and ready to snap outward at passing prey, a posture and hunting style that closely parallels the sit-and-wait ambush behaviour of a praying mantis, even though the two animals are entirely unrelated.
How does a skeleton shrimp stay so well hidden?
Its extremely thin, elongated body shape combined with mottled or translucent colouration allows a skeleton shrimp to blend in remarkably well among the similarly thin branches of seaweed, hydroid colonies, and bryozoans it typically inhabits, making it genuinely difficult for both predators and casual observers to spot even when looking directly at the structure it is clinging to.
Is a skeleton shrimp related to a regular shrimp?
Skeleton shrimp are crustaceans, placing them in the same broad group as true shrimp, crabs, and lobsters, but they belong to a separate family, Caprellidae, more closely related to amphipods than to true shrimp specifically, meaning the common name shrimp reflects a loose, general resemblance in the broader crustacean sense rather than a close taxonomic relationship with true shrimp species.