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Crustacean

From Wikipedia, the free encyclopedia
Crustaceans
Temporal range: 511–0 Ma
Pg
Cambrian to present
A diversity of diferent crustaceans, a group of segmented animals: Sally lightfoot crab (Grapsus grapsus), European lobster (Homarus gammarus), Red swamp crayfish (Procambarus clarkii), Pacific cleaner shrimp (Lysmata amboinensis), Antarctic krill (Euphasia superba), Hemilepistus reaumuri, Calanoida, and Pelagic gooseneck barnacle (Lepas anatifera).
From left to right and from top to bottom: Grapsus grapsus (a crab), Homarus gammarus (a lobster), Procambarus clarkii (a crayfish), Lysmata amboinensis (a shrimp), Euphausia superba (a krill), Hemilepistus reaumuri (a woodlouse), Calanoida (a copepod), and Lepas anatifera (a barnacle)
Scientific classificationEdit this classification
Kingdom: Animalia
Phylum: Arthropoda
Clade: Pancrustacea
Subphylum: Crustacea
Groups included
Cladistically included but traditionally excluded taxa

Hexapods

Crustaceans (Crustacea /krʌˈstʃə/) form a large, diverse arthropod taxon which includes such animals as crabs, lobsters, crayfish, shrimp, krill, prawns, woodlice, barnacles, copepods, amphipods and mantis shrimp.[1] The crustacean group can be treated as a subphylum under the clade Mandibulata; because of recent molecular studies it is now well accepted that the crustacean group is paraphyletic, and comprises all animals in the clade Pancrustacea other than hexapods.[2] Some crustaceans (Remipedia, Cephalocarida, Malacostraca) are more closely related to insects and the other hexapods than they are to certain other crustaceans.[3]

The 67,000 described species range in size from Stygotantulus stocki at 0.1 mm (0.004 in), to the Japanese spider crab with a leg span of up to 3.8 m (12.5 ft) and a mass of 20 kg (44 lb). Like other arthropods, crustaceans have an exoskeleton, which they moult to grow. They are distinguished from other groups of arthropods, such as insects, myriapods and chelicerates, by the possession of biramous (two-parted) limbs, and by their larval forms, such as the nauplius stage of branchiopods and copepods.

Most crustaceans are free-living aquatic animals, but some are terrestrial (e.g. woodlice), some are parasitic (e.g. Rhizocephala, fish lice, tongue worms) and some are sessile (e.g. barnacles). The group has an extensive fossil record, reaching back to the Cambrian, and includes living fossils such as Triops cancriformis, which has existed apparently unchanged since the Triassic period. More than 7.9 million tons of crustaceans per year are produced by fishery or farming for human consumption,[4] most of it being shrimp and prawns. Krill and copepods are not as widely fished, but may be the animals with the greatest biomass on the planet, and form a vital part of the food chain. The scientific study of crustaceans is known as carcinology (alternatively, malacostracology, crustaceology or crustalogy), and a scientist who works in carcinology is a carcinologist.

Structure[]

A convex oval-shaped piece of shell, covered with fine orange-pink markings: the front edge is lined with 13 coarse serrations, while the rear edge is smooth.
A shed carapace of a lady crab, part of the hard exoskeleton
Body structure of a typical crustacean – krill

The body of a crustacean is composed of segments, which are grouped into three regions: the cephalon or head,[5] the pereon or thorax,[6] and the pleon or abdomen.[7] The head and thorax may be fused together to form a cephalothorax,[8] which may be covered by a single large carapace.[9] The crustacean body is protected by the hard exoskeleton, which must be moulted for the animal to grow. The shell around each somite can be divided into a dorsal tergum, ventral sternum and a lateral pleuron. Various parts of the exoskeleton may be fused together.[10]: 289 

Each somite, or body segment can bear a pair of appendages: on the segments of the head, these include two pairs of antennae, the mandibles and maxillae;[5] the thoracic segments bear legs, which may be specialised as pereiopods (walking legs) and maxillipeds (feeding legs).[6] The abdomen bears pleopods,[7] and ends in a telson, which bears the anus, and is often flanked by uropods to form a tail fan.[11] The number and variety of appendages in different crustaceans may be partly responsible for the group's success.[12]

Crustacean appendages are typically biramous, meaning they are divided into two parts; this includes the second pair of antennae, but not the first, which is usually uniramous, the exception being in the Class Malacostraca where the antennules may be generally biramous or even triramous.[13][14] It is unclear whether the biramous condition is a derived state which evolved in crustaceans, or whether the second branch of the limb has been lost in all other groups. Trilobites, for instance, also possessed biramous appendages.[15]

The main body cavity is an open circulatory system, where blood is pumped into the haemocoel by a heart located near the dorsum.[16] Malacostraca have haemocyanin as the oxygen-carrying pigment, while copepods, ostracods, barnacles and branchiopods have haemoglobins.[17] The alimentary canal consists of a straight tube that often has a gizzard-like "gastric mill" for grinding food and a pair of digestive glands that absorb food; this structure goes in a spiral format.[18] Structures that function as kidneys are located near the antennae. A brain exists in the form of ganglia close to the antennae, and a collection of major ganglia is found below the gut.[19]

In many decapods, the first (and sometimes the second) pair of pleopods are specialised in the male for sperm transfer. Many terrestrial crustaceans (such as the Christmas Island red crab) mate seasonally and return to the sea to release the eggs. Others, such as woodlice, lay their eggs on land, albeit in damp conditions. In most decapods, the females retain the eggs until they hatch into free-swimming larvae.[20]

Ecology[]

Most crustaceans are aquatic, living in either marine or freshwater environments, but a few groups have adapted to life on land, such as terrestrial crabs, terrestrial hermit crabs, and woodlice. Marine crustaceans are as ubiquitous in the oceans as insects are on land.[21][22] Most crustaceans are also motile, moving about independently, although a few taxonomic units are parasitic and live attached to their hosts (including sea lice, fish lice, whale lice, tongue worms, and Cymothoa exigua, all of which may be referred to as "crustacean lice"), and adult barnacles live a sessile life – they are attached headfirst to the substrate and cannot move independently. Some branchiurans are able to withstand rapid changes of salinity and will also switch hosts from marine to non-marine species.[23]: 672  Krill are the bottom layer and the most important part of the food chain in Antarctic animal communities.[24]: 64  Some crustaceans are significant invasive species, such as the Chinese mitten crab, Eriocheir sinensis,[25] and the Asian shore crab, Hemigrapsus sanguineus.[26]

Life cycle[]

Seven round translucent spheres: inside some of them, a pair of compound eyes can be seen.
Eggs of Potamon fluviatile, a freshwater crab
A grey-green translucent animal is seen from the side. The eye is large and shining and is in a recess of the large carapace and its long rostrum. An abdomen, similar in length to the carapace, projects from the rear, and below the carapace, there is a mass of legs, some with small claws.
Zoea larva of the European lobster, Homarus gammarus

Mating system[]

Most crustaceans have separate sexes, and reproduce sexually. In fact, a recent study explains how the male crustaceans,T. Californicus decide which females to mate with by dietary differences, preferring when the females are algae-fed instead of yeast-fed. [27] A small number are hermaphrodites, including barnacles, remipedes,[28] and Cephalocarida.[29] Some may even change sex during the course of their life.[29] Parthenogenesis is also widespread among crustaceans, where viable eggs are produced by a female without needing fertilisation by a male.[27] This occurs in many branchiopods, some ostracods, some isopods, and certain "higher" crustaceans, such as the Marmorkrebs crayfish.

Eggs[]

In many groups of crustaceans, the fertilised eggs are simply released into the water column, while others have developed a number of mechanisms for holding on to the eggs until they are ready to hatch. Most decapods carry the eggs attached to the pleopods, while peracarids, notostracans, anostracans, and many isopods form a brood pouch from the carapace and thoracic limbs.[27] Female Branchiura do not carry eggs in external ovisacs but attach them in rows to rocks and other objects.[30]: 788  Most leptostracans and krill carry the eggs between their thoracic limbs; some copepods carry their eggs in special thin-walled sacs, while others have them attached together in long, tangled strings.[27]

Larvae[]

Crustaceans exhibit a number of larval forms, of which the earliest and most characteristic is the nauplius. This has three pairs of appendages, all emerging from the young animal's head, and a single naupliar eye. In most groups, there are further larval stages, including the zoea (pl. zoeæ or zoeas[31]). This name was given to it when naturalists believed it to be a separate species.[32] It follows the nauplius stage and precedes the post-larva. Zoea larvae swim with their thoracic appendages, as opposed to nauplii, which use cephalic appendages, and megalopa, which use abdominal appendages for swimming. It often has spikes on its carapace, which may assist these small organisms in maintaining directional swimming.[33] In many decapods, due to their accelerated development, the zoea is the first larval stage. In some cases, the zoea stage is followed by the mysis stage, and in others, by the megalopa stage, depending on the crustacean group involved.

Classification[]

The name "crustacean" dates from the earliest works to describe the animals, including those of Pierre Belon and Guillaume Rondelet, but the name was not used by some later authors, including Carl Linnaeus, who included crustaceans among the "Aptera" in his Systema Naturae.[34] The earliest nomenclaturally valid work to use the name "Crustacea" was Morten Thrane Brünnich's Zoologiæ Fundamenta in 1772,[35] although he also included chelicerates in the group.[34]

The subphylum Crustacea comprises almost 67,000 described species,[36] which is thought to be just 110 to 1100 of the total number as most species remain as yet undiscovered.[37] Although most crustaceans are small, their morphology varies greatly and includes both the largest arthropod in the world – the Japanese spider crab with a leg span of 3.7 metres (12 ft)[38] – and the smallest, the 100-micrometre-long (0.004 in) Stygotantulus stocki.[39] Despite their diversity of form, crustaceans are united by the special larval form known as the nauplius.

The exact relationships of the Crustacea to other taxa are not completely settled as of April 2012. Studies based on morphology led to the Pancrustacea hypothesis,[40] in which Crustacea and Hexapoda (insects and allies) are sister groups. More recent studies using DNA sequences suggest that Crustacea is paraphyletic, with the hexapods nested within a larger Pancrustacea clade.[41][42]

Although the classification of crustaceans has been quite variable, the system used by Martin and Davis[43] largely supersedes earlier works. Mystacocarida and Branchiura, here treated as part of Maxillopoda, are sometimes treated as their own classes. Six classes are usually recognised:

Copepods, from Ernst Haeckel's 1904 work Kunstformen der Natur
Decapods, from Ernst Haeckel's 1904 work Kunstformen der Natur
Class Members Orders Photo
Ostracoda Seed Shrimp Myodocopida
Halocyprida
Platycopida
Podocopida
A translucent, sculptured shell conceals a small animal. Some of its appendages extend beyond the shell.
Cylindroleberididae (Myodocopida)
Mystacocarida Mystococaridans
Pentastomida Tongue Worms Cephalobaenida
Porocephalida

A translucent, sculptured shell conceals a small animal. Some of its appendages extend beyond the shell.
Armillifer armillatus (Porocephalida)
Branchiura Fish Lice Arguloida

Dipteropeltis
Dolops
A translucent, sculptured shell conceals a small animal. Some of its appendages extend beyond the shell.
Argulus ambystoma (Arguloida)
Thecostraca facetotecta
ascothoracida
barnacles
Facetotecta
Ascothoracida
Cirripedia
A translucent, sculptured shell conceals a small animal. Some of its appendages extend beyond the shell.
(Cirripedia)
Copepoda Copepods Calanoida
Canuelloida
Cyclopoida
Gelyelloida
Harpacticoida
Misophrioida
etc.
A translucent, sculptured shell conceals a small animal. Some of its appendages extend beyond the shell.
Cylindroleberididae (Calanoida)
Malacostraca Mantis Shrimp
Decapods
Krill
Isopods
Hooded Shrimp
Amphipods
etc.
Stomatopoda
Decapoda
Euphausiacea
Isopoda
Cumacea
Amphipoda
etc.
A small, curled-up animal has feathery appendages which it is holding at diverse angles.
Ocypode ceratophthalma (Decapoda)
Cephalocarida Horseshoe Shrimp Brachypoda
Hutchinsoniella macracantha
Branchiopoda Fairy Shrimp
Water Fleas
Tadpole Shrimp
Clam Shrimp
Anostraca
Notostraca
Laevicaudata
Spinicaudata
A microscopic, transparent, oval animal against a black background. The head has a large eye, antennae, and comes to a pointed beak. The rest of the animal is smooth round and fat, culminating in a pointed tail. The internal anatomy is apparent.
Lepidurus arcticus (Notostraca)
Remipedia Remipedes Nectiopoda
Hexapoda Springtails
Dragonflies
Crickets
Beetles
Lacewings
Wasps
etc.
Collembola
Odonata
Orthoptera
Coleoptera
Neuroptera
Hymenoptera
etc.
A translucent, sculptured shell conceals a small animal. Some of its appendages extend beyond the shell.
Mantispa styriaca (Neuroptera)

Fossil record[]

In a smooth grey block of stone, there is a brown fossil similar to a crayfish. Two long legs, each with a large claw extend forwards from the animal; one of the claws is held open.
Eryma mandelslohi, a fossil decapod from the Jurassic of Bissingen an der Teck, Germany

Crustaceans have a rich and extensive fossil record, which begins with animals such as Canadaspis and Perspicaris from the Middle Cambrian age Burgess Shale.[44][45] Most of the major groups of crustaceans appear in the fossil record before the end of the Cambrian, namely the Branchiopoda, Maxillopoda (including barnacles and tongue worms) and Malacostraca; there is some debate as to whether or not Cambrian animals assigned to Ostracoda are truly ostracods, which would otherwise start in the Ordovician.[46] The only classes to appear later are the Cephalocarida,[47] which have no fossil record, and the Remipedia, which were first described from the fossil Tesnusocaris goldichi, but do not appear until the Carboniferous.[48] Most of the early crustaceans are rare, but fossil crustaceans become abundant from the Carboniferous period onwards.[44]

A heap of small pink lobsters on their sides, with their claws extended forwards towards the camera.
Norway lobsters on sale at a Spanish market

Within the Malacostraca, no fossils are known for krill,[49] while both Hoplocarida and Phyllopoda contain important groups that are now extinct as well as extant members (Hoplocarida: mantis shrimp are extant, while Aeschronectida are extinct;[50] Phyllopoda: Canadaspidida are extinct, while Leptostraca are extant[45]). Cumacea and Isopoda are both known from the Carboniferous,[51][52] as are the first true mantis shrimp.[53] In the Decapoda, prawns and polychelids appear in the Triassic,[54][55] and shrimp and crabs appear in the Jurassic;.[56][57] The fossil burrow Ophiomorpha is attributed to ghost shrimps, whereas the fossil burrow Camborygma is attributed to crayfishes. The Permian–Triassic deposits of Nurra preserve the oldest (Permian: Roadian) fluvial burrows ascribed to ghost shrimps (Decapoda: Axiidea, Gebiidea) and crayfishes (Decapoda: Astacidea, Parastacidea), respectively.[58]

However, the great radiation of crustaceans occurred in the Cretaceous, particularly in crabs, and may have been driven by the adaptive radiation of their main predators, bony fish.[57] The first true lobsters also appear in the Cretaceous.[59]

Consumption by humans[]

Many crustaceans are consumed by humans, and nearly 10,700,000 tons were produced in 2007; the vast majority of this output is of decapod crustaceans: crabs, lobsters, shrimp, crawfish, and prawns.[60] Over 60% by weight of all crustaceans caught for consumption are shrimp and prawns, and nearly 80% is produced in Asia, with China alone producing nearly half the world's total.[60] Non-decapod crustaceans are not widely consumed, with only 118,000 tons of krill being caught,[60] despite krill having one of the greatest biomasses on the planet.[61]

See also[]

References[]

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