Fine Art

Crustacea sp. Fossil, Photo: Michael Lahanas

Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Ecdysozoa
Cladus: Panarthropoda
Phylum: Arthropoda
Subphylum: Crustacea
Superclasses: Allotriocarida – Multicrustacea – Oligostraca

Name

Crustacea Brünnich, 1772
References

Brünnich M. Th., 1772. Zoologiae fundamenta praelectionibus academicis accommodata. Grunde i Dyrelaeren. Hafniae et Lipsiae: Apud Frider. Christ. Pelt., 254 pp.
Ahyong, S.T., Lowry, J.K., Alonso, M., Bamber, R.N., Boxshall, G.A., Castro, P., Gerken, S., Karaman, G.S., Goy, J.W., Jones, D.S., Meland, K., Rogers, D.C. & Svavarsson, J. 2011. Subphylum Crustacea Brünnich, 1772. Pp 165–191 In Zhang, Z.-Q. (ed.) 2011. Animal biodiversity: an outline of higher-level classification and survey of taxonomic richness. Zootaxa 3148: 1–237. Open access. Reference page. ISBN 978-1-86977-849-1 (paperback). ISBN 978-1-86977-850-7 (online edition). PDF. Reference page.
Boxshall G.A., 2007. Crustacean classification: on-going controversies and unresolved problems. Pp. 313-325 In: Zhang Z.-Q. & Shear W.A., (eds) Linnaeus tercentenary: progress in invertebrate taxonomy. Zootaxa, 1668: 1–766 (Abstract & excerpt).
Brusca R.C. & Brusca, G.J., 1990. Invertebrates. Sinauer Associates, Sunderland, MA (USA). 922 pp.
Lamarck J.-B., 1801. Système des Animaux sans Vertèbres, ou Tableau général des classes, des ordres et des genres de ces animaux. Paris: Detreville, viii + 432pp. PDF
Lecointre G. & Le Guyader H., 2006. The tree of life. A phylogenetic classification. The Belknap Press of Harvard University Press, Cambridge, Massachusetts. ISBN 0-674-02183-5 ISBN 978-0-674-02183-9 (cloth : alk. paper).
Martin J.W. & Davis G.E., 2001. An updated classification of the Recent Crustacea. Natural History Museum of Los Angeles County contributions in science, 39: 1–124 (PDF).
Regier, J.C., Shultz, J.W., Zwick, A., Hussey, A., Ball, B., Wetzer, R., Martin, J.W. & Cunningham, C.W. 2010. Arthropod relationships revealed by phylogenomic analysis of nuclear protein-coding sequences. Nature 463(7284): 1079–1083. DOI: 10.1038/nature08742 Reference page.
Roskov Y., Ower G., Orrell T., Nicolson D., Bailly N., Kirk P.M., Bourgoin T., DeWalt R.E., Decock W., Nieukerken E. van, Zarucchi J., Penev L., eds. (2019). Species 2000 & ITIS Catalogue of Life, 2019 Annual Checklist. Digital resource at www.catalogueoflife.org/annual-checklist/2019. Species 2000: Naturalis, Leiden, the Netherlands. ISSN 2405-884X.

Additional references

Cortés, J. 2017. Marine biodiversity baseline for Área de Conservación Guanacaste, Costa Rica: published records. ZooKeys 652: 129–179. DOI: 10.3897/zookeys.652.10427. Reference page.
Gallão, J.E. & Bichuette, M.E. 2018. Brazilian obligatory subterranean fauna and threats to the hypogean environment. ZooKeys 746: 1–23. DOI: 10.3897/zookeys.746.15140. Reference page.
Raupach, M.J. & Redulovici, A.E. 2015. Looking back on a decade of barcoding crustaceans. Zookeys 539: 53-81. DOI: 10.3897/zookeys.539.6530 Full article Reference page.

Vernacular names
Alemannisch: Chräbstierer
azərbaycanca: Xərçəngkimilər
беларуская: Ракападобныя
čeština: Korýši
Deutsch: Krebstiere
Ελληνικά: Καρκινοειδή (Οστρακοειδή ή Οστρακόδερμα)
English: crustaceans
español: Crustáceos
suomi: Äyriäiset
Nordfriisk: Kraaben
français: Crustacés
magyar: Rákok
հայերեն: Խեցապատեանք
日本語: 甲殻亜門
한국어: 갑각아문(甲殼亞門)
македонски: Раковидни членконоги
Nederlands: Krabben
polski: Skorupiaki
português: Crustáceo
русский: Ракообразные членистоногие
slovenčina: Kôrovce
svenska: Kräftdjur
தமிழ்: ஓட்டுடலிகள்
Türkçe: Kabuklular
中文: 甲壳亚门
Links

Crustacea in the World Register of Marine Species

Crustaceans belong to the subphylum Crustacea (/krəˈsteɪʃə/), and form a large, diverse group of arthropods including decapods, seed shrimp, branchiopods, fish lice, krill, remipedes, isopods, barnacles, copepods, amphipods and mantis shrimp.[1] The crustacean group can be treated as a subphylum under the clade Mandibulata. It is now well accepted that the hexapods (such as insects) emerged deep in the Crustacean group, with the completed group referred to as Pancrustacea.[2] Some crustaceans (Remipedia, Cephalocarida, Branchiopoda) 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, sandhoppers), 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. More than 7.9 million tons of crustaceans per year are harvested by fishery or farming for human consumption,[4] consisting mostly of 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]
See also: Hemolymph

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
Abludomelita obtusata, an amphipod

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] Since the piercing of the Suez Canal, close to 100 species of crustaceans from the Red Sea and the Indo-Pacific realm have established themselves in the eastern Mediterranean sub-basin, with often significant impact on local ecosystems.[27]
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 T. californicus decide which females to mate with by dietary differences, preferring when the females are algae-fed instead of yeast-fed.[28] A small number are hermaphrodites, including barnacles, remipedes,[29] and Cephalocarida.[30] Some may even change sex during the course of their life.[30] Parthenogenesis is also widespread among crustaceans, where viable eggs are produced by a female without needing fertilisation by a male.[28] This occurs in many branchiopods, some ostracods, some isopods, and certain "higher" crustaceans, such as the Marmorkrebs crayfish.
Eggs

In many crustaceans, the fertilised eggs are 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.[28] Female Branchiura do not carry eggs in external ovisacs but attach them in rows to rocks and other objects.[31]: 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.[28]
Larvae
Main article: Crustacean 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[32]). This name was given to it when naturalists believed it to be a separate species.[33] 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.[34] 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.

To camouflage themselves against predators, the otherwise black eyes in several forms of swimming larvae are covered by a thin layer of crystalline isoxanthopterin which gives their eyes the same color as the surrounding water, while tiny holes in it allows light to reach the retina. As the larvae mature into adults, the layer migrates to a new position behind the retina where it works as a backscattering mirror that increase the intensity of light passing through the eyes, as seen in many nocturnal animals.[35]
DNA repair

In an effort to understand whether DNA repair processes can protect crustaceans against DNA damage, basic research was conducted to elucidate the repair mechanisms used by Penaeus monodon (black tiger shrimp).[36] Repair of DNA double-strand breaks was found to be predominantly carried out by accurate homologous recombinational repair. Another, less accurate process, microhomology-mediated end joining, is also used to repair such breaks. The expression pattern of DNA repair related and DNA damage response genes in the intertidal copepod Tigriopus japonicus was analyzed after ultraviolet irradiation.[37] This study revealed increased expression of proteins associated with the DNA repair processes of non-homologous end joining, homologous recombination, base excision repair and DNA mismatch repair.
Classification and phylogeny

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.[38] The earliest nomenclaturally valid work to use the name "Crustacea" was Morten Thrane Brünnich's Zoologiæ Fundamenta in 1772,[39] although he also included chelicerates in the group.[38]

The subphylum Crustacea comprises almost 67,000 described species,[40] which is thought to be just 1⁄10 to 1⁄100 of the total number as most species remain as yet undiscovered.[41] 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)[42] – and the smallest, the 100-micrometre-long (0.004 in) Stygotantulus stocki.[43] 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,[44] 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.[45][46]

Although the classification of crustaceans has been quite variable, the system used by Martin and Davis[47] largely supersedes earlier works. Mystacocarida and Branchiura, here treated as part of Maxillopoda, are sometimes treated as their own classes. Eleven classes are recognised[by whom?]:

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 Mystococarida A line drawing of a dorsal view of a small animal with many segments and appendages.
Ctenocheilocaris galvarini
Ichthyostraca Tongue worms and fish lice Cephalobaenida
Porocephalida
Raillietiellida
Reighardiida
Arguloida
A translucent, sculptured shell conceals a small animal. Some of its appendages extend beyond the shell.
Armillifer armillatus
(Porocephalida)
Thecostraca Facetotecta
Ascothoracida
Barnacles
Facetotecta
Dendrogastrida
Laurida
Cryptophialida
Lithoglyptida
etc.
A translucent, sculptured shell conceals a small animal. Some of its appendages extend beyond the shell.
Perforatus perforatus
(Cirripedia)
Copepoda Copepods Calanoida
Polyarthra
Cyclopoida
Gelyelloida
Harpacticoida
Misophrioida
etc.
A translucent, sculptured shell conceals a small animal. Some of its appendages extend beyond the shell.
Cylindroleberididae
(Calanoida)
Tantulocarida Tantulocaridians Tantulus larva (Microdajus sp.)
Microdajus sp.
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
etc.
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
†Enantiopoda

Speleonectes tanumekes
Hexapoda Springtails
Proturans
Diplurans
Insects
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)

The following cladogram shows the updated relationships between the different extant groups of the paraphyletic Crustacea in relation to the class Hexapoda.[48]

Pancrustacea
Oligostraca

Ostracoda

Mystacocarida

Ichthyostraca

Branchiura

Pentastomida

Altocrustacea
Multicrustacea

Copepoda

Tantulocarida

Thecostraca

Malacostraca

Allotriocarida

Cephalocarida

Athalassocarida

Branchiopoda 

Labiocarida

Remipedia

Hexapoda

Crustacea

According to this diagram, the Hexapoda are deep in the Crustacea tree, and any of the Hexapoda is distinctly closer to e.g. a Multicrustacean than an Oligostracan is.
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.[49][50] 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.[51] The only classes to appear later are the Cephalocarida,[52] which have no fossil record, and the Remipedia, which were first described from the fossil Tesnusocaris goldichi, but do not appear until the Carboniferous.[53] Most of the early crustaceans are rare, but fossil crustaceans become abundant from the Carboniferous period onwards.[49]
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,[54] 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;[55] Phyllopoda: Canadaspidida are extinct, while Leptostraca are extant[50]). Cumacea and Isopoda are both known from the Carboniferous,[56][57] as are the first true mantis shrimp.[58] In the Decapoda, prawns and polychelids appear in the Triassic,[59][60] and shrimp and crabs appear in the Jurassic.[61][62] 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.[63]

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.[62] The first true lobsters also appear in the Cretaceous.[64]
Consumption by humans

Many crustaceans are consumed by humans, and nearly 10,700,000 tons were harvested in 2007; the vast majority of this output is of decapod crustaceans: crabs, lobsters, shrimp, crawfish, and prawns.[65] 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.[65] Non-decapod crustaceans are not widely consumed, with only 118,000 tons of krill being caught,[65] despite krill having one of the greatest biomasses on the planet.[66]
See also

iconCrustaceans portal

Pain in crustaceans

References

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