Eunicidae

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Eunicidae
Temporal range: Ordovician–recent
Eunice aphroditois.jpg
Eunice aphroditois
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Annelida
Clade: Pleistoannelida
Subclass: Errantia
Order: Eunicida
Family: Eunicidae
Berthold, 1827
Genera

See text

Basic Eunicidae anatomy Basic Eunicidae Anatomy.png
Basic Eunicidae anatomy
A 1910 monograph of British marine annelids including Eunice fasciata and Marphysa sanguinea A monograph of the British marine annelids 1910 LIV.jpg
A 1910 monograph of British marine annelids including Eunice fasciata and Marphysa sanguinea
A portrait of Georges Cuvier, creator of the Eunice genus Georges Cuvier.png
A portrait of Georges Cuvier, creator of the Eunice genus

Eunicidae is a family of marine polychaetes (bristle worms). The family comprises marine annelids distributed in diverse benthic habitats across Oceania, Europe, South America, North America, Asia and Africa. [1] The Eunicid anatomy typically consists of a pair of appendages near the mouth (mandibles) and complex sets of muscular structures on the head (maxillae) in an eversible pharynx. [2] One of the most conspicuous of the eunicids is the giant, dark-purple, iridescent "Bobbit worm" (Eunice aphroditois), a bristle worm found at low tide under boulders on southern Australian shores. Its robust, muscular body can be as long as 2 m. [3] Eunicidae jaws are known from as far back as Ordovician sediments. [4] [5] Cultural tradition surrounds Palola worm (Palola viridis) reproductive cycles in the South Pacific Islands. [6] Eunicidae are economically valuable as bait in both recreational and commercial fishing. [7] [8] Commercial bait-farming of Eunicidae can have adverse ecological impacts. [9] Bait-farming can deplete worm and associated fauna population numbers, [10] damage local intertidal environments [11] and introduce alien species to local aquatic ecosystems. [12]

Contents

In 2020, Zanol et al. stated, "Species traditionally considered to belong to Eunice are now, also, distributed in two other genera Leodice and Nicidion recently resurrected to reconcile Eunicidae taxonomy with its phylogenetic hypothesis." [13]

History of knowledge

In 1992, Kristian Fauchald detailed a conclusive history of research and classification of the Eunicidae family. [4] Primary studies undertaken in 1767 on coral reefs in Norway, initially classified Eunicid species under the Nereis family. [4] In 1817, Georges Cuvier created a new genus, Eunice, to classify these and other original taxa. [4] Throughout the 1800s (1832-1878) worm species were added to this genera by Jean Victor Audouin and Henri Milne-Edwards, Kinberg, Edwardsia de Quatrefages, Malmgren, Ehlers and Grube. [4] Following the Challenger and Albatross expeditions, research was expanded by McIntosh and Chamberlain. [4] In 1921 and 1922, Treadwell added new species from coral reefs in the Caribbean Sea and the Pacific Ocean. [4] Species were reviewed and their classifications were refined by Fauvel, Augener and Hartman throughout the early 1900s. [4] In 1944, Hartman codified a system of separate classification for the family, informally grouping North American species using the original suggestions of Ehlers. [4] Hartman's system was expanded and specified by Fauchald in 1970 and later again by Miura in 1986. [4]

Taxonomy

Thirty-three genera have been described in the Eunicidae family. [14] [15] Only twelve are currently considered valid: [16]

The trace fossil ichnotaxon Lepidenteron lewesiensis likely corresponds to the fossilized burrow of a eunicid. These burrows are often lined with the fossilized remains of the prey of their occupant, which include a diversity of fish taxa. [17]

Anatomy

Segmented body

Members of the Eunicidae family are distinguished from other families in Eunicida by having a rear segment with 1-3 antennae and no ringed bases on their antennae. [18] The first body segment of Eunicidae is either whole or consists of two lobes. [18] The gills of live specimens are typically identifiable by their bright red colour. [19]

Head and jaws

A pair of slender and cylindrical sensory appendages are typically situated near the head of Eunicidae. [18] The lips of Eunicidae can be either reduced or well-developed. [18] In the Eunice species, worms have five appendages on two elongated segmented appendages and three antennae near their heads. [18] This feature is not part of the anatomy of all genera in the Eunicidae family. Eunicidae jaws are typically well developed and partly visible on the underside of the worm or on its surface at the front of the mouth in a complex structure. [18] [19]

Body wall

Some species of Eunicidae have extensions of the body wall that loop into the vascular system. [18] These usually consist of either comb-like or single filaments. [18]

Ecology

Distribution and habitat

Eunicidae are distributed in diverse benthic habitats across Oceania, Europe, South America, North America, Asia and Africa. Eunicids play an ecological role in benthic communities, exhibiting a preference for subtidal hard substrates in shallow temperate waters, tropical waters and mangrove swamps. [1] [4] Most species of Eunicidae inhabit cracks and crevices in assorted rubble, rock, and sand environments. [4] In limestone or coral reefs, Eunicids burrow into hard parchment-like tube corals or remain in crevices of calcareous algae. [20]

Diet

Eunicid diets vary across genera. For example, the Eunice aphroditois crawl on the seafloor where they scavenge in a carnivorous feeding pattern on marine worms, small crustaceans, molluscs, algae and detritus. [2] [14] [21] [22] [23] Other species, for example Euniphysa tubifex and large Eunice, hunt the surrounds of their coral habitats and feed on the decaying flesh of dead sea-life. [2] [24] Burrowing species of Eunicidae (Lysidice and Palola) are primarily herbivores. These species feed on matured corals and contained organisms or on types of algae. [25] The diet of Marphysa species of Eunicidae is variable, some worms are herbivores, [23] some are carnivores [26] and others omnivores. [2] [24]

Threats

The practice of harvesting polychaetes (including species in the Eunicidae family) as bait may have negative ecological impacts on intertidal habitats and on worm population numbers. [9] [11] In 2019, Cabral et al. found that Marphysa sanguinea are placed at risk by overfishing and unlicensed harvesting in Portugal. [9] The ecological impacts of bait harvesting activity can also affect associated fauna populations [10] as well as sediment quality [27] and bioavailability of heavy metals. [28] [9] Research indicates that mudworm survival and growth may also be affected by changes in salinity rates. [29]

Ecological impact

Importing Eunicidae species is an established alternative to exploiting local populations for bait. [12] This process may lead to accidental species introductions or invasions. [30] [31] Alien species can threaten the foundation of local ecosystems by altering food webs, habitat structures and gene pools. [30] Alien species can also introduce diseases and parasites. [31] [32] Six species of Eunice, one species of Euniphysa, three species of Lysidice and one species of Marphysa sp. were identified as alien in local aquatic ecosystems across the Mediterranean, the Red Sea, the USA Pacific and the North Sea. [30] Live bait worms are often emptied into the water body by anglers at the end of a fishing session, this is another practice that can introduce alien species to aquatic ecosystems. [12] [30] [31]

Life cycle

Sexual reproduction

Most of the class Polychaeta are benthic sexual reproductive animals and lack external reproductive organs. [33] When mating, female polychaetes produce a pheromone that induces a mutual release of male sperm and female eggs. This process of synchronous reproduction in the form of a swarm is known as epitoky. During this process, there is no actual male to female contact. The reproductive swarm is ejected into open water. Cells that fuse during fertilisation (gametes) are spawned through an excretory gland (metanephridia) or by the main worm body-wall rupturing. [34] Post-fertilisation, most eggs become planktonic; although some remain inside the worm tubes or burrow in external jelly masses attached to the tubes. [34] Epitokes can draw an increased number of pelagic predators. [6] In the Florida Keys for example, the swarming of Eunice fucata is a highly publicised in local fishing communities, attracting a large gathering of tarpon. [6] These mass swarming events, or ‘risings’, are a spectacle that is the foundation of local tradition in Samoa, Fiji, Tonga, Papua New Guinea, Vanuatu, Kiribati and Indonesia. [1]

A close up of Eunice sp. Eunice rubra.jpg
A close up of Eunicesp.

Human relations

A close up of a bloodworm, popular fishing bait Nerr0328.jpg
A close up of a bloodworm, popular fishing bait

As bait in commercial and recreational fishing

Palola worm epitoky cycle in Samoa Paloloworm cycle.jpg
Palola worm epitoky cycle in Samoa

Marphysa sanguinea, or known locally in Italy as “Murrido”, “Murone”, “Bacone” and “Verme sanguigno” is the most valuable bait of all Polychaete species collected in Italy. [7] This species is also cultivated in USA and South Korea and is typically commercially harvested once at its optimal length of 20–30 cm. [7] Marphysa sanguinea can reach up to 50 cm long and is collected by excavating in deep sediment. [8] For example, in the Venice lagoon, fisherman dig below the sediment layers colonised by the nereidids and sieve organic material through coarse screens. [35] This process is also common in Italian coastal areas with intertidal and shallow littoral muddy bottoms. [7] Eunice aphroditois, another sizeable (up to 1 metre in length) species of Eunicidae, is harvested by scuba divers along the Italian Apulia coasts. [7] This species is collected at soft bottom ocean floors at a depth of 10 metres using specialised harvesting instruments that fit into U-shaped parchment tubes where the worm lives. [8] This species of Eunicidae is suitable bait for fish of the Sparidae family and is used in commercial hook and line practice. [7] Species within the Eunicidae family are also caught by recreational and commercial fisherman in estuaries along the West coast of Portugal and in Arcahon Bay in France. [7] [36] Marphysa are propagated and harvested in Australian estuary communities located along the coast of New South Wales and Queensland. [36] Collecting of Marphysa moribidii as bait occurs along the West coast of Peninsular Malaysia, Marphysa elityeni are caught in subsistence fisheries in Africa and Eunice sebastiani have been reported as being harvested for bait in Brazil. [36] Eunicids are also used as supplementary feed for aquaculture. [8] [37] [38] [39] For example, mudworms are a part of the black tiger prawn diet in some Thailand hatcheries. [37] [40]

In legend and culture

In the Indo-Pacific, during 1-2 nights each year, the epitokes of the Palola viridis species are automatised. [1] [6] The sizeable epitokes (up to 30 cm in length) swim autonomously upwards and rupture, releasing gametes across the surface of the ocean. [1] The epitokes are composed of hundreds of segments, with females emerald in colour and males transitioning from orange to brown during maturation. [6] On ‘rising’ night it is tradition for some local communities to attract epitokes with artificial light sources or using other traditional methods. [36] In Samoa for example, locals wear necklaces made of mosoʻoi flowers and use the fragrant floral scent to attract Palola worms. [36] The epitokes are scooped from the shallows into nets and containers to be consumed raw, or cooked, baked, dried or frozen for later consumption. [36]

See also

Related Research Articles

<span class="mw-page-title-main">Polychaete</span> Class of annelid worms

Polychaeta is a paraphyletic class of generally marine annelid worms, commonly called bristle worms or polychaetes. Each body segment has a pair of fleshy protrusions called parapodia that bear many bristles, called chaetae, which are made of chitin. More than 10,000 species are described in this class. Common representatives include the lugworm and the sandworm or clam worm Alitta.

<span class="mw-page-title-main">Epitoky</span> Sexual maturation process in marine worms

Epitoky is a process that occurs in many species of polychaete marine worms wherein a sexually immature worm is modified or transformed into a sexually mature worm. Epitokes are pelagic morphs capable of sexual reproduction. Unlike the immature form, which is typically benthic, epitokes are specialized for swimming as well as reproducing. The primary benefit to epitoky is increased chances of finding other members of the same species for reproduction.

<i>Spirobranchus giganteus</i> Species of marine tube worm

Spirobranchus giganteus, commonly known as the Christmas tree worm, is a tube-building polychaete worm belonging to the family Serpulidae. The S. giganteus lives in coral reefs in the Indo-Pacific region to the Caribbean.

<span class="mw-page-title-main">Serpulidae</span> Family of annelids

The Serpulidae are a family of sessile, tube-building annelid worms in the class Polychaeta. The members of this family differ from other sabellid tube worms in that they have a specialized operculum that blocks the entrance of their tubes when they withdraw into the tubes. In addition, serpulids secrete tubes of calcium carbonate. Serpulids are the most important biomineralizers among annelids. About 300 species in the family Serpulidae are known, all but one of which live in saline waters. The earliest serpulids are known from the Permian, and possibly the upper Permian south China

<i>Palola viridis</i> Species of invertebrate in the family Eunicidae

Palola viridis, commonly known as the palolo worm, Samoan palolo worm, balolo, wawo, or nyale, is a Polychaeta species from the waters of some of the Pacific islands, including Samoa, Tonga, Fiji, Vanuatu, and the islands of the maritime Southeast Asia.

<i>Eunice</i> (annelid) Genus of worms

Eunice is a genus in the polychaete family Eunicidae. Individuals grow to a length of between 0.5 and 300 cm. Their bodies have multiple segments. They have two eyes and five tentacles. They have well-developed sense organs and relatively large brains. Their color is dark purple-brown to red-brown with a white ring at the fourth segment. They are found in oceans and seas around the world. They have an evertible proboscis with distinctive mouthparts, some of which comprise two rows of maxilliary plates in a radula-like fashion.

<i>Serpula</i> Genus of annelid worms

Serpula is a genus of sessile, marine annelid tube worms that belongs to the family Serpulidae. Serpulid worms are very similar to tube worms of the closely related sabellid family, except that the former possess a cartilaginous operculum that occludes the entrance to their protective tube after the animal has withdrawn into it. The most distinctive feature of worms of the genus Serpula is their colorful fan-shaped "crown". The crown, used by these animals for respiration and alimentation, is the structure that is most commonly seen by scuba divers and other casual observers.

<i>Alitta succinea</i> Common clam worm

Alitta succinea is a species of marine annelid in the family Nereididae. It has been recorded throughout the North West Atlantic, as well as in the Gulf of Maine and South Africa.

<span class="mw-page-title-main">Errantia</span> Subclass of annelid worms

Errantia is a diverse group of marine polychaete worms in the phylum Annelida. Traditionally a subclass of the paraphyletic class Polychaeta, it is currently regarded as a monophyletic group within the larger Pleistoannelida, composed of Errantia and Sedentaria. These worms are found worldwide in marine environments and brackish water.

<i>Terebellides</i> Genus of annelids

Terebellides is a genus of polychaete worms in the family Trichobranchidae.

<i>Eulagisca gigantea</i> Species of annelid worm

Eulagisca gigantea is a species of scale worm. This species is specifically found in the deep-sea in cold waters like the Antarctic Ocean. The scale worms are named for the elytra on their surface that look like scales.

<i>Palola</i> Genus of polychaetes

Palola is a genus of polychaetes belonging to the family Eunicidae.

<i>Eunice aphroditois</i> Species of worm

Eunice aphroditois is a benthic bristle worm of warm marine waters. It lives mainly in the Atlantic Ocean, but can also be found in the Indo-Pacific. It ranges in length from less than 10 cm (4 in) to 3 m (10 ft). Its exoskeleton displays a wide range of colors, from black to purple and more. This species is an ambush predator; it hunts by burrowing its whole body in soft sediment on the ocean floor and waiting until its antennae detect prey. It then strikes with its sharp mandibles. It may also be found among coral reefs.

Admetella hastigerens is a scale worm known from the east Pacific Ocean at depths of about 1000–1200m.

Benhamipolynoe is a genus of marine annelids in the family Polynoidae. The genus is known from the Pacific and Atlantic Oceans and includes 2 species.

Polyeunoa laevis is a scale worm which is widely distributed in the Southern Ocean and occurs over a wide depth range, from 35m to 2450m.

Benhamipolynoe antipathicola is a deep-sea scale worm that has been reported from the Pacific and Atlantic Oceans from depths of 128 to almost 500m.

Yodanoe is a genus of marine polychaete worms belonging to the family Polynoidae, the scaleworms. Yodanoe contains a single species, Yodanoe desbruyeresi which is known from the Clarion-Clipperton Fracture Zone in the equatorial East Pacific Ocean at a depth of almost 5000 m.

Ysideria is a genus of marine polychaete worms belonging to the family Polynoidae, the scale worms. Ysideria contains a single species, Ysideria hastata which is known from the North Pacific Ocean off the coast of California at depths of about 50–60 m.

Diopatra claparedii is a species of tube-building polychaete worm of the family Onuphidae. It is found dispersed along intertidal and subtidal benthic environments of South Asian waters, especially along the coasts of Malaysia, Singapore, Thailand, and the Philippines. This species is exploited by humans for fishing bait, indication of marine pollution, and as gold and silver nanoparticle biosynthesis agents.

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  38. ↑ Alava, V. R., Biñas, J. B., & Mandario, M. A. E. (2017). Breeding and culture of the polychaete, Marphysa mossambica, as feed for the mud crab. In E. T. Quinitio, F. D. Parado-Estepa, & R. M. Coloso (Eds.), Philippines : In the forefront of the mud crab industry development : proceedings of the 1st National Mud Crab Congress, 16–18 November 2015, Iloilo City, Philippines (pp. 39–45). Tigbauan, Iloilo, Philippines: Aquaculture Department, Southeast Asian Fisheries Development Center. https://repository.seafdec.org.ph/handle/10862/3197
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  40. ↑ Meunpol, Oraporn; Meejing, Panadda; Piyatiratitivorakul, Somkiat (2005). "Maturation diet based on fatty acid content for male Penaeus monodon (Fabricius) broodstock". Aquaculture Research. 36 (12): 1216–1225. doi: 10.1111/j.1365-2109.2005.01342.x . ISSN   1355-557X.
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