''Alpheus heterochaelis'', the bigclaw snapping shrimp, is a snapper or pistol shrimp in the

family Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ...

Alpheidae Alpheidae (also known as the snapping shrimp, pistol shrimp or alpheid shrimp) is a family (biology), family within the shrimp infraorder Caridea characterized by having asymmetrical claws, the larger of which is typically capable of producing a ...

. It is found in the western

Atlantic Ocean The Atlantic Ocean is the second largest of the world's five borders of the oceans, oceanic divisions, with an area of about . It covers approximately 17% of Earth#Surface, Earth's surface and about 24% of its water surface area. During the ...

and the

Gulf of Mexico The Gulf of Mexico () is an oceanic basin and a marginal sea of the Atlantic Ocean, mostly surrounded by the North American continent. It is bounded on the northeast, north, and northwest by the Gulf Coast of the United States; on the southw ...

Description

The bigclaw snapping shrimp has a small

rostrum Rostrum may refer to: * Any kind of a platform for a speaker: **dais **pulpit ** podium * Rostrum (anatomy), a beak, or anatomical structure resembling a beak, as in the mouthparts of many sucking insects * Rostrum (ship), a form of bow on naval ...

and no spines on the edge of its

carapace A carapace is a dorsal (upper) section of the exoskeleton or shell in a number of animal groups, including arthropods, such as crustaceans and arachnids, as well as vertebrates, such as turtles and tortoises. In turtles and tortoises, the unde ...

. The big claw or chela which gives it its common name can be either the right or left claw and is disproportionally large, measuring half the length of the body. It has a deep notch on either side beneath the finger joint. The other claw is unmodified and of normal size. The bigclaw is the largest species of snapping shrimp in its home range, growing to a maximum length of , but most adults are considerably smaller than this. Its colour is a translucent dark green with orange and blue tips to the

uropod Uropods are posterior appendages found on a wide variety of crustaceans. They typically have functions in locomotion. Definition Uropods are often defined as the appendages of the last body segment of a crustacean. An alternative definition sugge ...

Distribution and habitat

The bigclaw snapping shrimp is found in tropical and semitropical waters in the

, the

West Indies The West Indies is an island subregion of the Americas, surrounded by the Atlantic Ocean, North Atlantic Ocean and the Caribbean Sea, which comprises 13 independent island country, island countries and 19 dependent territory, dependencies in thr ...

Bermuda Bermuda is a British Overseas Territories, British Overseas Territory in the Atlantic Ocean, North Atlantic Ocean. The closest land outside the territory is in the American state of North Carolina, about to the west-northwest. Bermuda is an ...

, and the western

from

Cape Hatteras Cape Hatteras is a cape located at a pronounced bend in Hatteras Island, one of the barrier islands of North Carolina. As a temperate barrier island, the landscape has been shaped by wind, waves, and storms. There are long stretches of beach ...

south to

Florida Florida ( ; ) is a U.S. state, state in the Southeastern United States, Southeastern region of the United States. It borders the Gulf of Mexico to the west, Alabama to the northwest, Georgia (U.S. state), Georgia to the north, the Atlantic ...

and

Brazil Brazil, officially the Federative Republic of Brazil, is the largest country in South America. It is the world's List of countries and dependencies by area, fifth-largest country by area and the List of countries and dependencies by population ...

. It lives close to the seabed in shallow waters favouring

reef A reef is a ridge or shoal of rock, coral, or similar relatively stable material lying beneath the surface of a natural body of water. Many reefs result from natural, abiotic component, abiotic (non-living) processes such as deposition (geol ...

seagrass meadow A seagrass meadow or seagrass bed is an underwater ecosystem formed by seagrasses. Seagrasses are marine (saltwater) plants found in shallow coastal waters and in the brackish waters of estuaries. Seagrasses are flowering plants with stems and ...

salt marsh A salt marsh, saltmarsh or salting, also known as a coastal salt marsh or a tidal marsh, is a coastal ecosystem in the upper coastal intertidal zone between land and open saltwater or brackish water that is regularly flooded by the tides. I ...

es and muddy areas. It often conceals itself in a natural aperture during the day though it is unclear whether it can dig itself a burrow.

Biology

The bigclaw snapping shrimp produces a loud, staccato concussive noise with its snapping claw. The sound is produced when the claw snaps shut at great speed creating a high-speed water jet. This creates a small, short-lived cavitation bubble and it is the immediate collapse of this bubble that creates the sound. A spark is formed at the same time. The snapping noise serves to deter

predators Predation is a biological interaction in which one organism, the predator, kills and eats another organism, its prey. It is one of a family of common feeding behaviours that includes parasitism and micropredation (which usually do not kill ...

and to stun prey, and is also used for display purposes. The bigclaw snapping shrimp feeds on

worm Worms are many different distantly related bilateria, bilateral animals that typically have a long cylindrical tube-like body, no limb (anatomy), limbs, and usually no eyes. Worms vary in size from microscopic to over in length for marine ...

s, small

crustacean Crustaceans (from Latin meaning: "those with shells" or "crusted ones") are invertebrate animals that constitute one group of arthropods that are traditionally a part of the subphylum Crustacea (), a large, diverse group of mainly aquatic arthrop ...

s and fish such as

gobies Gobiidae or gobies is a family of bony fish in the order Gobiiformes, one of the largest fish families comprising over 2,000 species in more than 200 genera. Most of gobiid fish are relatively small, typically less than in length, and the fam ...

and

pearlfish Pearlfish are marine fish in the ray-finned fish family Carapidae. Pearlfishes inhabit the tropical waters of the Atlantic, Indian, and Pacific Oceans at depths to , along oceanic shelves and slopes. They are slender, elongated fish with no s ...

. It is itself eaten by the

weakfish ''Cynoscion'' is a genus of marine ray-finned fishes belonging to the family, Sciaenidae, the drums and croakers. These fishes are found off the coasts of North and South America in the western Atlantic and eastern Pacific Oceans. Many fishes in ...

(''Cynoscion regalis''). It is often associated with the black-clawed mud crab (''Panopeus herbstii''), sharing the crab's burrow and remaining uneaten, even though this crab eats similar-sized shrimps of other species. Bigclaw snapping shrimps mostly live as

monogamous Monogamy ( ) is a relationship of two individuals in which they form a mutual and exclusive intimate partnership. Having only one partner at any one time, whether for life or serial monogamy, contrasts with various forms of non-monogamy (e.g. ...

pairs. The female is only receptive for a short time just after

moult In biology, moulting (British English), or molting (American English), also known as sloughing, shedding, or in many invertebrates, ecdysis, is a process by which an animal casts off parts of its body to serve some beneficial purpose, either at ...

ing. The

eggs An egg is an organic vessel in which an embryo begins to develop. Egg, EGG or eggs may also refer to: Biology * Egg cell, the female reproductive cell (gamete) in oogamous organisms Food * Eggs as food Places * Egg, Austria * Egg, Switzerland ...

hatch about four weeks after being laid and the

larva A larva (; : larvae ) is a distinct juvenile form many animals undergo before metamorphosis into their next life stage. Animals with indirect development such as insects, some arachnids, amphibians, or cnidarians typically have a larval phase ...

e do not feed, but instead rely on their egg yolks. They develop very quickly and pass through their three larval stages in about five days. The newly

metamorphosed Metamorphic rocks arise from the transformation of existing rock to new types of rock in a process called metamorphism. The original rock (protolith) is subjected to temperatures greater than and, often, elevated pressure of or more, causi ...

juvenile shrimps have equal sized chelae; one of these enlarges at a later stage.

References

{{Portal bar, Crustaceans, Marine life Alpheidae Caridea of the Atlantic Ocean Crustaceans of Brazil Crustaceans described in 1818 Taxa named by Thomas Say