Symbion pandora was an important discovery for scientists in 1995. While it is not considered unusual to discover a new species, it is unusual to find a new phylum. Cycliophora, its designated phylum, was created because the digestive system and reproductive cycle are unique to the animal kingdom. There are still many unknowns concerning S. pandora. Most information on its life cycle and sexual habits are hypothetical.
Symbion pandora has a bilateral, sack-like body with no coelom. There are three basic life stages:
Asexual Feeding Stage- At this stage S. pandora is neither male nor female. It has a length of 347 um and a width of 113 um. On the posterior end of the sack-like body is a stalk with an adhesive disk, which attaches itself to the host. On the anterior end is a ciliated funnel (mouth) and an anus.
Male- S. pandora has a length of 84 um and a width of 42 um during this stage. It has no mouth or anus, which signifies the absence of a digestive system. It also has two reproductive organs.
Female- S. pandora is the same size as the male in this stage. It does, however, have a digestive system which collapses and reconstitutes itself as larva.
Other Physical Features: ectothermic ; heterothermic ; bilateral symmetry
Sexual Dimorphism: sexes alike
Symbion pandora can be found on the mouth bristles of the Norwegian lobster. It attaches to the lobster with an adhesive disk located on its posterior end. Symbion pandora shares a symbiotic relationship with its host. It recieves easy access to food with out harming or helping the Norwegian lobster. This is called commensalism.
Habitat Regions: saltwater or marine
Aquatic Biomes: coastal
Symbion pandora can be found on the lips of Norwegian lobsters, Nephrops norvegicus. They are found at depths of 20-40 meters (66-131 feet) from coastal Norway south to the coastline of the Mediterranean region.
Biogeographic Regions: atlantic ocean (Native )
Symbion pandora attaches itself on the lips of Norwegian lobsters, where it then sweeps food particles into its ciliated, disk-shaped mouth. The digestive system is closely intertwined with the reproductive cycle. A unique feature of the digestive system of S. pandora is that it collapses and becomes larva.
Foraging Behavior: filter-feeding
This species is parasitic on Norweigan lobsters.
Ecosystem Impact: parasite
Species Used as Host:
Unknown at this time
Unknown at this time
Symbion pandora is not on vulnerable, threatened, or endangered status. In fact, large populations can be found on a single lobster.
US Federal List: no special status
CITES: no special status
Symbion pandora reproduces both sexually and asexually. It reproduces asexually by young budding off from the asexual feeding stage. The sexual cycle begins only during the molting season of the Norwegian lobster, its host. The male attaches itself to a feeding stage that contains a developing female and impregnates her. She escapes from the feeding stage and attaches herself to the host. The larva develops within the female S. pandora She then dies and the larva escapes.
Key Reproductive Features: sexual ; asexual ; fertilization ; ovoviviparous
With its formal description in 1995, Symbion pandora, discovered living on the mouthparts of Norwegian Lobsters (Nephrops norvegicus) in the North Atlantic, became the first species described and placed in the new phylum Cycliophora (Funch and Kristensen 1995). Interestingly, the sessile (i.e., attached to substrate) feeding stage of S. pandora had been known since the 1960s, but was not described until 1995 (Funch and Kristensen 1997, cited in Kristensen 2002).
The cycliophoran body is divided into an anterior buccal funnel, an oval trunk, and a posterior acellular stalk and adhesive disc by which the animal attaches itself to setae (flexible hair-like projections) on the host's mouthparts. Females are about 350 µm long and 100 µm wide. They are suspension feeders, obtaining food by creating water currents with dense cilia around the open end of the buccal funnel. The U-shaped gut is ciliated along its entire length, ending with an anus located near the base of the buccal funnel. Circulation and gas exchange are presumably accomplished by simple diffusion. Obst and Funch (2003) reported S. pandora population densities ranging from fewer than 100 to more than 500 feeding stages per mouthpart.
The Cycliophora currently includes just two described species: Symbion pandora Funch and Kristensen, 1995 from the mouthparts of the Norwegian Lobster (Nephrops norvegicus) and S. americanus Obst, Funch, and Kristensen, 2006 from the mouthparts of the American Lobster (Homarus americanus) (an apparently distinct third species lives on the mouthparts of the European Lobster [Homarus gammarus]; Obst et al. 2005) . For at least S. americanus, there is evidence suggesting that this nominal species may in fact include several cryptic species (Obst et al. 2005, 2006; Baker and Giribet 2007; Baker et al. 2007), which could turn out to be true for S. pandora as well. All three known hosts of Cycliophora are members of the lobster family Nephropidae. Reports of cycliophorans on nematodes and non-nephropid crustaceans (e.g., copepods) are apparently all in error and instead are based on observations of chonotrich ciliates. Examination by transmission electron microscopy is required to see that, in contrast to a cycliophoran, the ciliate consists of just a single cell with several nuclei. (Kristensen 2002)
Cycliophorans have a very complex life cycle that alternates between sexual and asexual phases. The most prominent stage is the asexual and sessile feeding stage, which lives attached to the setae of the host lobster's mouthparts and filters small food particles from the water. For a detailed description of the complex life cycle of Symbion pandora, see General Description; for a whimsical but informative account, check out the CreatureCast podcast on this topic.
A growing body of evidence suggests that the sister group to the Cycliophora is the Entoprocta (=Kamptozoa) (Fuchs et al. 2010 and references therein), consistent with the suggestion made by Funch and Kristensen (1995) in their original description, although cycliophorans share many similarities with the Rotifera and some molecular analyses have indicated a close relationship between these two groups (e.g., Winnepenninckx et al. 1998).
The phylum name Cycliophora is derived from Greek roots meaning "wheel bearing", referring to the circular mouth ring. The genus name Symbion is derived from Greek roots meaning "living together", referring to this animal's intimate association with its lobster host. The specific epithet pandora is a reference to the feeding stage, which contains both an inner bud and a Pandora larva with a miniature feeding stage inside, reminding the authors of Pandora's Box of Greek mythology. (Funch and Kristensen 1995)
Symbion pandora va ser el primer membre descobert del gènere Symbion i per tant, també, de l'embrancament dels cicliòfors, el 1995 per Reinhardt Kristensen i Peter Funch en la boca d'un Nephrops norvegicus. Es va crear un fílum expressament per a aquesta espècie, però no se sap molt bé on col·locar-lo. Morfològicament té retirada amb un briozou o un entoprocte, però s'han descobert similituds anatòmiques amb els gnatífers.
Symbion pandora va ser el primer membre descobert del gènere Symbion i per tant, també, de l'embrancament dels cicliòfors, el 1995 per Reinhardt Kristensen i Peter Funch en la boca d'un Nephrops norvegicus. Es va crear un fílum expressament per a aquesta espècie, però no se sap molt bé on col·locar-lo. Morfològicament té retirada amb un briozou o un entoprocte, però s'han descobert similituds anatòmiques amb els gnatífers.
De Noarske symbion (Latynske namme: Symbion pandora) is in mikroskopysk lyts, wringeleas, rjusellich organisme út 'e stamme fan 'e (platwjirmeftige) krânsdieren (Cycliophora) en it skaai fan 'e symbions (Symbion). Dit bistke waard pas yn 1995 wittenskiplik beskreaun. De Noarske symbion libbet op 'e hierkes by de bek fan 'e Noarske kreeft (Nephrops norvegicus).
De Noarske symbion wie al yn 'e sechtiger jierren ûntdutsen troch Tom Fenchel, mar earst in de njoggentiger jierren waard der ûndersyk nei dien. Troch de dêrút fuortkommende beskriuwing, út 1995, opsteld troch de biologen Reinhardt Kristensen en Peter Funch, die bliken dat it bistke yn 'e besteande stammen net yn te passen wie. Sadwaande waard der spesjaal foar de Noarske symbion in nije taksonomyske stamme oprjochte, dy fan 'e krânsdieren (Cycliophora). Binnen it skaai fan 'e symbions (Symbion) krige de Noarske symbion de wittenskiplike namme fan Symbion pandora, dy't ferwiist nei de myte fan 'e Doaze fan Pandoara, om't de fuortplantingssyklus fan it bistke Kristensen en Funch dat ferhaal tebinnenbrocht. Letter waarden ek symbions ûntdutsen by de Amerikaanske kreeft (Homarus americanus) en de Jeropeeske kreeft (Homarus gammarus). It die bliken dat it om trije ferskillende soarten gie, mar de soarte dy't foarkomt op 'e Jeropeeske kreeft hat noch gjin wittenskiplike namme krigen.
De Noarske symbion is in sekfoarmich bistke dat likernôch 0,35 mm grut wurde kin. Oan 'e efterein fan it liif sit in soarte fan sûchnap dêr't er him mei fêstset op 'e mûlehierren fan 'e Noarske kreeft. Oan 'e foarkant sit in bûtenproporsjoneel grutte mûle-iepening dy't foarsjoen is fan in rûnte of "krâns" (dêrfandinne de namme "krânsdieren") fan behurde "toskjes". Noarske symbions libje fan 'e lytsere, yn it wetter omdriuwkeljende itensdieltsjes dy't frijkomme as de kreeft syn proai lytsman makket. Om't se de kreeft gjin inkele lêst besoargje, wurde se net sjoen as parasiten, mar as kommensalisten.
Noarske symbions hawwe fjouwer libbensstadia: aseksueel, manlik, froulik en larve. Yn it aseksuële itensstadium hat it bistke gjin geslacht en is it 0,35 mm lang mei in breedte fan 0,11 mm. Yn dit stadium hâldt er him benammentlik dwaande mei iten. Yn it geslachtlike stadium binne sawol it mantsje as it wyfke 0,08 by 0,04 mm grut. It wyfke hat in spiisfertarringsstelsel, mar by it mantsje, dat inkeld tsjinnet om it wyfke te befruchtsjen, ûntbrekt dat.
De fuortplanting kin sawol geslachtlik as ûngeslachtlik plakfine. By ûngeslachtlike fuortplanting wurdt it spiisfertarringsstelsel fan it aseksuële eksimplaar of fan in wyfke út himsels omfoarme ta in larve. By geslachtlike fuortplanting set it mantsje him fêst oan in aseksueel eksimplaar dat op it punt stiet om troch ûngeslachtlike fuortplanting in wyfke fuort te bringen, en befruchtet er dat wyfke. Neitiid makket it wyfke har los fan it aseksuële eksimplaar en set se har op in oar plak fêst, dêr't de larve him yn har ûntjout. As it wyfke deagiet, ûntsnapt de larve, dy't him dan ûntwikkelet ta nij aseksueel eksimplaar. De fuortplantingssyklus fan Noarske symbions wurdt yn wurking steld as de kreeft dêr't se op libje, begjint te ferfeljen om groeie te kinnen.
De Noarske symbion (Latynske namme: Symbion pandora) is in mikroskopysk lyts, wringeleas, rjusellich organisme út 'e stamme fan 'e (platwjirmeftige) krânsdieren (Cycliophora) en it skaai fan 'e symbions (Symbion). Dit bistke waard pas yn 1995 wittenskiplik beskreaun. De Noarske symbion libbet op 'e hierkes by de bek fan 'e Noarske kreeft (Nephrops norvegicus).
Symbion pandora is a jug-shaped microscopic aquatic animal that dwells on the mouth-parts of Norway lobsters. The animals are less than ½ mm wide, with sac-like bodies, and three distinctly different forms in different parts of their three-stage life cycle.
They are so unlike any known animal that its discovery by Danish scientists in 1995[1] led to the creation of a new phylum. The phylum Cycliophora, from the Greek for 'carrying a small wheel', was named after the creature's circular mouth.[2] Two other members of that phylum have since been discovered.
Symbion refers to the animal's symbiotic relationship with its lobster host while the specific epithet pandora refers to the part of the organism's life cycle that reminded Funch and Christensen of the mythical Pandora's box.
Symbion pandora has a bilateral, sac-like body with no coelom. There are three basic life stages:
Symbion pandora can reproduce both asexually by budding and sexually. The sexual reproductive cycle is triggered when the host crustacean molts its skin in order to grow: a feeding stage buds a male, which attaches to another feeding stage and triggers it to bud a female, which it impregnates. The female is able to swim, and finds another host crustacean, where the larva in her develops. The female dies, and the larva escapes, spawning another feeding stage on the new host.[3]
Symbion pandora is a jug-shaped microscopic aquatic animal that dwells on the mouth-parts of Norway lobsters. The animals are less than ½ mm wide, with sac-like bodies, and three distinctly different forms in different parts of their three-stage life cycle.
Symbion pandora est une espèce de cycliophores.
Ce sont des animaux microscopiques (0,4 mm sur 0,1 mm pour la femelle et 0,1 mm sur 0,05 mm pour le mâle nain). Ils vivent sur les pièces buccales de la langoustine commune (Nephrops norvegicus) et se rencontrent en mer du Nord, en mer Méditerranée et dans l'océan Atlantique près de l'Europe.
Symbion pandora est une espèce de cycliophores.
Ce sont des animaux microscopiques (0,4 mm sur 0,1 mm pour la femelle et 0,1 mm sur 0,05 mm pour le mâle nain). Ils vivent sur les pièces buccales de la langoustine commune (Nephrops norvegicus) et se rencontrent en mer du Nord, en mer Méditerranée et dans l'océan Atlantique près de l'Europe.
Symbion pandora is een soort kransdiertje uit het geslacht Symbion. Het diertje behoort tot de familie Symbiidae. Symbion pandora werd in 1995 beschreven door Reinhardt Kristensen & Peter Funch.[1]
Symbion pandora is een soort kransdiertje uit het geslacht Symbion. Het diertje behoort tot de familie Symbiidae. Symbion pandora werd in 1995 beschreven door Reinhardt Kristensen & Peter Funch.
