{{Short description|Family of annelids}} {{Automatic taxobox | image = Syllis gracilis.jpg | image_caption = ''[[Syllis gracilis]]'' micrograph, showing the distinctive barrel-shaped proventricle | taxon = Syllidae | authority = Grube 1850<ref name=worms>{{cite WoRMS |author=Gil, J. |author2=Musco, L. |year=2015 |title=Syllidae Grube, 1850 |id= 948 |access-date=16 September 2017 |db=polychaeta}}</ref> | synonyms = Levidoridae }}
[[File:Syllid_polychaete_undergoing_epitoky.jpg|thumb|[[Schizogamy]] in syllid polychaete]] '''Syllidae,''' commonly known as the '''necklace worms''',<ref>{{Cite web |title=Necklace-worms -- KnowBC - the leading source of BC information |url=https://www.knowbc.com/limited/Books/Marine-Life-of-the-Pacific-Northwest/Invertebrates/Worms/Segmented-Worms/Polychaetes/Sensory-Palp-Polychaetes/Necklace-worms |access-date=2023-02-02 |website=www.knowbc.com}}</ref> is a [[Family (taxonomy)|family]] of small to medium-sized [[polychaete worm]]s. Syllids are distinguished from other polychaetes by the presence of a muscular region of the anterior digestive tract known as the ''proventricle''.<ref name=eol>{{cite web |title= Syllidae |first=Marcelo V. |last=Fukuda |publisher=[[Encyclopedia of Life]] |url=http://www.eol.org/pages/121/ |access-date=16 September 2017}}</ref><ref name=":0">{{Cite book |last1=Lamb |first1=Andy |title=Marine Life of the Pacific Northwest |last2=Hanby |first2=Bernard P. |publisher=[[Harbour Publishing]] |year=2005 |isbn=1-55017-361-8 |location=Canada |page=133}}</ref>
Syllid worms range in size from {{convert|2-3|mm|in|2|abbr=on}} to {{convert|14|cm|in}}. Most syllids are [[benthic]] organisms that transition to a [[pelagic]] [[epitoke]] for reproduction. They are found in all regions of the ocean, from the [[intertidal zone]] to the [[deep sea]], and are especially abundant in shallow water.<ref name=eol /><ref>{{cite journal |title=Guide and keys for the identification of Syllidae (Annelida, Phyllodocida) from the British Isles (reported and expected species) |journal=[[ZooKeys]] |year=2015 |issue=488 |pages=1–29 |first1=Guillermo |last1=San Martín |first2=Tim M. |last2=Worsfold |pmc=4389122 |doi=10.3897/zookeys.488.9061|pmid=25878521 |doi-access=free }}</ref>
They are found in a range of habitats, moving actively on rock and sandy substrates, hiding in crevices and among seaweeds, and climbing on sponges, corals, hydrozoans, seagrasses and mangroves. They are generalist feeders.<ref name=Sigvaldadottir>{{cite book|author1=Sigvaldadottir, Elin|author2=Mackie, Andrew S.Y.|author3= Helgason, Gudmundur V. |author4=Reish, Donald J. |author5=Svavarsson, Jorundur |author6=Steingrimsson, Sigmar A. |author7=Gudmundsson, Gudmundur|title=Advances in Polychaete Research|url=https://books.google.com/books?id=RsHxCAAAQBAJ&pg=PA288 |year=2013|publisher=Springer Science & Business Media |isbn=978-94-017-0655-1 |page=288}}</ref> A young Syllid was one of the first worms to be found with pollen from seagrass in its stomach, making it a possible pollinator.<ref>{{cite journal |last1=van Tussenbroek |first1=Brigitta I. |last2=Villamil |first2=Nora |last3=Márquez-Guzmán |first3=Judith |last4=Wong |first4=Ricardo |last5=Monroy-Velázquez |first5=L. Verónica |last6=Solis-Weiss |first6=Vivianne |title=Experimental evidence of pollination in marine flowers by invertebrate fauna |journal=Nature Communications |date=29 September 2016 |volume=7 |issue=1 |article-number=12980 |doi=10.1038/ncomms12980 |pmid=27680661 |pmc=5056424 |bibcode=2016NatCo...712980V |s2cid=1903911 |language=en |issn=2041-1723|doi-access=free }}</ref>
The ''proventricle'', Syllid worm's most distinctive anatomical feature, allows the worm to feed by sucking due to its pumping action. It also plays a role in hormone production, and thus the worm's sexual development.<ref name=":0" /> The proventricle is composed of [[Striated muscle tissue|strirated muscle]] cells with the longest known [[Sarcomere|sacromeres]] among animals.<ref>{{Cite journal |last1=Weidhase |first1=Michael |last2=Beckers |first2=Patrick |last3=Bleidorn |first3=Christoph |last4=Aguado |first4=M. Teresa |date=2016-10-04 |title=On the role of the proventricle region in reproduction and regeneration in Typosyllis antoni (Annelida: Syllidae) |journal=BMC Evolutionary Biology |volume=16 |issue=1 |page=196 |doi=10.1186/s12862-016-0770-5 |issn=1471-2148 |pmc=5050598 |pmid=27716025 |doi-access=free }}</ref> The proventricle is usually visible through the body wall.<ref>{{Cite web |title=Syllidae: Brief Summary |url=https://eol.org/pages/121/articles |access-date=2023-02-02 |website=eol.org |language=en}}</ref>
''[[Syllis ramosa]]'' was the first polychaete discovered to have a branching body plan.<ref name=Marshall>{{cite news |title=Zoologger: the worm that looks like a tree |author=Marshall, Michael |url=https://www.newscientist.com/article/dn21535-zoologger-the-worm-that-looks-like-a-tree/ |newspaper=New Scientist |date=2 March 2012 |access-date=28 September 2017}}</ref> Later, two species of [[Ramisyllis]] were discovered to have a branching body plan.
== Subfamilies == * ''[[Anoplosyllinae]]'' ** ''[[Streptosyllis]]'' *** ''[[Streptosyllis bidentata]]'' <small>(Southern, 1914)</small> *** ''[[Streptosyllis websteri]]'' <small>(Southern, 1914)</small> **''[[Syllides]]'' ***''[[Syllides benedicti]]'' <small>(Banse, 1971)</small> *** ''[[Syllides longocirrata]]'' <small>(Ørsted, 1845)</small> * ''[[Eusyllinae]]'' ** ''[[Clavisyllis]]'' *** ''[[Clavisyllis alternata]]'' <small>Knox, 1957</small> *** ''[[Clavisyllis tenjini]]'' <small>Cejp, Jimi & Aguado, 2023</small> *** ''[[Clavisyllis yongei]]'' <small>Watson, 2009</small> ** ''[[Eusyllis]]'' *** ''[[Eusyllis assimilis]]'' <small>(Marenzeller, 1875)</small> *** ''[[Eusyllis blomstrandi]]'' <small>(Malmgren, 1867)</small> *** ''[[Eusyllis lamelligera]]'' <small>(Marion & Bobretzky, 1875)</small> ** ''[[Nudisyllis]]'' *** ''[[Nudisyllis divaricata]]'' <small>(Keferstein, 1862)</small> *** ''[[Nudisyllis pulligera]]'' <small>(Krohn, 1852)</small> ** ''[[Odontosyllis]]'' *** ''[[Odontosyllis ctenostoma]]'' <small>(Claparède, 1868)</small> *** ''[[Odontosyllis enopla]]'' <small>([[Addison Emery Verrill|Verrill]], 1900)</small> *** ''[[Odontosyllis fulgurans]]'' <small>(Audouin & Milne-Edwards, 1833)</small> *** ''[[Odontosyllis gibba]]'' <small>(Claparède, 1863)</small> *** ''[[Odontosyllis phosphorea]]'' <small>(Moore, 1909)</small> ** ''[[Opisthodonta]]'' *** ''[[Opisthodonta longocirrata]]'' <small>(Saint-Joseph, 1886)</small> ** ''[[Pionosyllis]]'' *** ''[[Pionosyllis compacta]]'' <small>(Malmgren, 1867)</small> *** ''[[Pionosyllis serratisetosa]]'' <small>(López, San Martín & Jiménez, 1997)</small> ** ''[[Synmerosyllis]]'' *** ''[[Synmerosyllis lamelligera]]'' <small>(Saint-Joseph, 1886)</small> * ''[[Autolytinae]]'' ** ''[[Epigamia (subfamily)|Epigamia]]'' *** ''[[Epigamia alexandri]]'' <small>(Malmgren, 1867)</small> ** ''[[Myrianida]]'' *** ''[[Myrianida brachycephala]]'' <small>(Marenzeller, 1874)</small> *** ''[[Myrianida edwarsi]]'' <small>(Saint-Joseph, 1886)</small> *** ''[[Myrianida inermis]]'' <small>(Saint-Joseph, 1886)</small> *** ''[[Myrianida langerhansi]]'' <small>(Gidholm, 1967)</small> *** ''[[Myrianida pinnigera]]'' <small>(Montagu, 1808)</small> *** ''[[Myrianida prolifera]]'' <small>(O.F. Müller, 1788)</small> *** ''[[Myrianida quinquedecimdentata]]'' <small>(Langerhans, 1884)</small> *** ''[[Myrianida rubropunctata]]'' <small>(Grube, 1860)</small> ** ''[[Proceraea]]'' *** ''[[Proceraea aurantiaca]]'' <small>(Claparède, 1868)</small> *** ''[[Proceraea cornuta]]'' <small>(Agassiz, 1862)</small> *** ''[[Proceraea picta]]'' <small>(Ehlers, 1864)</small> *** ''[[Proceraea prismatica]]'' <small>(O.F. Müller, 1776)</small> *** ''[[Procerastea halleziana]]'' <small>(Malaquin, 1893)</small> *** ''[[Procerastea nematodes]]'' <small>(Langerhans, 1884)</small> * ''[[Exogoninae]]'' ** ''[[Brania]]'' *** ''[[Brania pusilla]]'' <small>(Dujardin, 1851)</small> ** ''[[Erinaceusyllis]]'' *** ''[[Erinaceusyllis cirripapillata]]'' <small>(San Martín, 2005)</small> *** ''[[Erinaceusyllis erinaceus]]'' <small>(Claparède, 1863)</small> *** ''[[Erinaceusyllis ettiennei]]'' <small>(San Martín, 2005)</small> *** ''[[Erinaceusyllis hartmannschroederae]]'' <small>(San Martín, 2005)</small> *** ''[[Erinaceusyllis kathrynae]]'' <small>(San Martín, 2005)</small> ** ''[[Exogone]]'' *** ''[[Exogone dispar]]'' <small>(Webster, 1879)</small> *** ''[[Exogone naidina]]'' <small>(Ørsted, 1845)</small> *** ''[[Exogone verugera]]'' <small>(Claparède, 1868)</small> ** ''[[Exogonita]]'' <small>Hartman & Fauchald, 1971</small> ** ''[[Parapionosyllis]]'' <small>Fauvel, 1923</small> ** ''[[Parexogone]]'' *** ''[[Parexogone longicirris]]'' <small>(Webster & Benedict, 1887)</small> *** ''[[Parexogone hebes]]'' <small>(Webster & Benedict, 1884)</small> ** ''[[Prosphaerosyllis]]'' *** ''[[Prosphaerosyllis tetralix]]'' <small>(Eliason, 1920)</small> ** ''[[Salvatoria]]'' <small>McIntosh, 1885</small> *** ''[[Salvatoria clavata]]'' <small>(Claparède, 1863)</small> *** ''[[Salvatoria limbata]]'' <small>(Claparède, 1868)</small> *** ''[[Salvatoria swedmarki]]'' <small>(Gidholm, 1962)</small> ** ''[[Sphaerosyllis]]'' *** ''[[Sphaerosyllis bardukaciculata]]'' <small>(San Martín, 2005)</small> *** ''[[Sphaerosyllis bulbosa]]'' <small>(Southern, 1914)</small> *** ''[[Sphaerosyllis goorabantennata]]'' <small>(San Martín, 2005)</small> *** ''[[Sphaerosyllis georgeharrisoni]]'' <small>(San Martín, 2005)</small> *** ''[[Sphaerosyllis hystrix]]'' <small>(Claparède, 1863)</small> *** ''[[Sphaerosyllis levantina]]''<small>(Faulwetter et al., 2011)</small> *** ''[[Sphaerosyllis pirifera]]'' <small>(Claparède, 1868)</small> *** ''[[Sphaerosyllis taylori]]'' <small>(Perkins, 1980)</small> *** ''[[Sphaerosyllis voluntariorum]]'' <small>(San Martín, 2005)</small> * ''[[Syllinae]]'' ** ''[[Syllis]]'' ***''[[Syllis aciculigrossa]]'' <small>(San Martín, 1990)</small> *** ''[[Syllis adamantea]]'' <small>(Treadwell, 1914)</small> *** ''[[Syllis albae]]'' <small>(Álvarez-Campos & Verdes, 2017)</small> *** ''[[Syllis albanyensis]]'' <small>(Hartmann-Schröder, 1984)</small> *** ''[[Syllis alosae]]'' <small>(San Martín, 1992)</small> *** ''[[Syllis alternata]]'' <small>(Moore, 1908)</small> *** ''[[Syllis amica]]'' <small>(Quatrefages, 1866)</small> *** ''[[Syllis amicarmillaris]]'' <small>(Simon, San Martín & Robinson, 2014)</small> *** ''[[Syllis anoculata]]'' <small>(Hartmann-Schröder, 1962)</small> *** ''[[Syllis antoniae]]'' <small>(Salcedo Oropeza, San Martín & Solís-Weiss, 2012)</small> *** ''[[Syllis armillaris]]'' <small>(O.F. Müller, 1776)</small> *** ''[[Syllis augeneri]]'' <small>(Haswell, 1920)</small> *** ''[[Syllis barbata]]'' <small>(San Martín, 1992)</small> *** ''[[Syllis bella]]'' <small>(Chamberlin, 1919)</small> *** ''[[Syllis beneliahuae]]'' <small>(Campoy & Alquézar, 1982)</small> *** ''[[Syllis benguellana]]'' <small>(Day, 1963)</small> *** ''[[Syllis boggemanni]]'' <small>(San Martín, Álvarez-Campos & Hutchings, 2017)</small> *** ''[[Syllis botosaneanui]]'' <small>(Hartmann-Schröder, 1973)</small> *** ''[[Syllis brasiliensis]]'' <small>(McIntosh, 1885)</small> *** ''[[Syllis breviarticulata]]'' <small>(Grube, 1857)</small> *** ''[[Syllis brevicirrata]]'' <small>(McIntosh, 1908)</small> *** ''[[Syllis brevicirris]]'' <small>(Hansen, 1882)</small> *** ''[[Syllis broomensis]]'' <small>(Hartmann-Schröder, 1979)</small> *** ''[[Syllis caeca]]'' <small>(Monro, 1933)</small> *** ''[[Syllis castroviejoi]]'' <small>(Capa, San Martín & López, 2001)</small> *** ''[[Syllis cerina]]'' <small>(Grube, 1878)</small> *** ''[[Syllis cirrita]]'' <small>(Lee & Rho, 1994)</small> *** ''[[Syllis columbretensis]]'' <small>(Campoy, 1982)</small> *** ''[[Syllis compacta]]'' <small>(Gravier, 1900)</small> *** ''[[Syllis corallicola]]'' <small>(Verrill, 1900)</small> *** ''[[Syllis cornuta]]'' <small>(Rathke, 1843)</small> *** ''[[Syllis crassicirrata]]'' <small>(Treadwell, 1925)</small> *** ''[[Syllis cruzi]]'' <small>(Núñez & San Martín, 1991)</small> *** ''[[Syllis curticirris]]'' <small>(Monro, 1937)</small> *** ''[[Syllis danieli]]'' <small>(San Martín, 1992)</small> *** ''[[Syllis deleoni]]'' <small>(Salcedo Oropeza, San Martín & Solís-Weiss, 2012)</small> *** ''[[Syllis edensis]]'' <small>(Hartmann-Schröder, 1989)</small> *** ''[[Syllis elongata]]'' <small>(Johnson, 1901)</small> *** ''[[Syllis ergeni]]'' <small>(Çinar, 2005)</small> *** ''[[Syllis erikae]]'' <small>(Hartmann-Schröder, 1981)</small> *** ''[[Syllis fasciata]]'' <small>(Malmgren, 1867)</small> *** ''[[Syllis ferrani]]'' <small>(Alós & San Martín, 1987)</small> *** ''[[Syllis filidentata]]'' <small>(Hartmann-Schröder, 1962)</small> *** ''[[Syllis garciai]]'' <small>(Campoy, 1982)</small> *** ''[[Syllis gerlachi]]'' <small>(Hartmann-Schröder, 1960)</small> *** ''[[Syllis gerundensis]]'' <small>(Alós & Campoy, 1981)</small> *** ''[[Syllis glandulata]]'' <small>(Nogueira & San Martín, 2002)</small> *** ''[[Syllis glarearia]]'' <small>(Westheide, 1974)</small> *** ''[[Syllis golfonovensis]]'' <small>(Hartmann-Schröder, 1962)</small> *** ''[[Syllis gracilis]]'' <small>(Grube, 1840)</small> *** ''[[Syllis guidae]]'' <small>(Nogueira & Yunda-Guarin, 2008)</small> *** ''[[Syllis heterochaeta]]'' <small>(Moore, 1909)</small> *** ''[[Syllis hyalina]]'' <small>(Grube, 1863)</small> *** ''[[Syllis hyllebergi]]'' <small>(Licher, 1999)</small> *** ''[[Syllis joaoi]]'' <small>(San Martín, Álvarez-Campos & Hutchings, 2017)</small> *** ''[[Syllis jorgei]]'' <small>(San Martín & López, 2000)</small> *** ''[[Syllis kabilica]]'' <small>(Ben-Eliahu, 1977)</small> *** ''[[Syllis karlae]]'' <small>(San Martín, Álvarez-Campos & Hutchings, 2017)</small> *** ''[[Syllis kas]]'' <small>(Lucas, Sikorski & San Martín, 2018)</small> *** ''[[Syllis komodoensis]]'' <small>(Aguado, San Martín & ten Hove, 2008)</small> *** ''[[Syllis krohnii]]'' <small>(Ehlers, 1864)</small> *** ''[[Syllis lagunae]]'' <small>(Tovar-Hernández, Hernández-Alcántara & Solís-Weiss, 2008)</small> *** ''[[Syllis latifrons]]'' <small>(Grube, 1857)</small> *** ''[[Syllis licheri]]'' <small>(Ravara, San Martín & Moreira, 2004)</small> *** ''[[Syllis limbata]]'' <small>(Grube, 1880)</small> *** ''[[Syllis longesegmentata]]'' <small>(Grube, 1857)</small> *** ''[[Syllis lunaris]]'' <small>(Imajima, 1966)</small> *** ''[[Syllis lutea]]'' <small>(Hartmann-Schröder, 1960)</small> *** ''[[Syllis luteoides]]'' <small>(Hartmann-Schröder, 1962)</small> *** ''[[Syllis macroceras]]'' <small>(Grube, 1857)</small> *** ''[[Syllis macrodentata]]'' <small>(Hartmann-Schröder, 1982)</small> *** ''[[Syllis magdalena]]'' <small>(Wesenberg-Lund, 1962)</small> *** ''[[Syllis magnapalpa]]'' <small>(Hartmann-Schröder, 1965)</small> *** ''[[Syllis marceloi]]'' <small>(San Martín, Álvarez-Campos & Hutchings, 2017)</small> *** ''[[Syllis marugani]]'' <small>(Aguado, San Martín & Nishi, 2006)</small> *** ''[[Syllis maryae]]'' <small>(San Martín, 1992)</small> *** ''[[Syllis mauretanica]]'' <small>(Licher, 1999)</small> *** ''[[Syllis mayeri]]'' <small>(Musco & Giangrande, 2005)</small> *** ''[[Syllis mercedesae]]'' <small>(Lucas, San Martín & Parapar, 2012)</small> *** ''[[Syllis mexicana]]'' <small>(Rioja, 1960)</small> *** ''[[Syllis microoculata]]'' <small>(Hartmann-Schröder, 1965)</small> *** ''[[Syllis monilaris]]'' <small>(Savigny in Lamarck, 1818)</small> *** ''[[Syllis mytilorum]]'' <small>(Studer, 1889)</small> *** ''[[Syllis nigra]]'' <small>(Augener, 1925)</small> *** ''[[Syllis nigrescens]]'' <small>(Grube, 1878)</small> *** ''[[Syllis nigricirris]]'' <small>(Grube, 1863)</small> *** ''[[Syllis nigriscens]]'' <small>(Grube, 1878)</small> *** ''[[Syllis nigropunctata]]'' <small>(Haswell, 1886)</small> *** ''[[Syllis notocera]]'' <small>(Ehlers, 1905)</small> *** ''[[Syllis nuchalis]]'' <small>(Hartmann-Schröder, 1960)</small> *** ''[[Syllis obscura]]'' <small>(Grube, 1857)</small> *** ''[[Syllis onkylochaeta]]'' <small>(Hartmann-Schröder, 1991)</small> *** ''[[Syllis ortizi]]'' <small>(San Martín, 1992)</small> *** ''[[Syllis parapari]]'' <small>(San Martín & López, 2000)</small> *** ''[[Syllis parturiens]]'' <small>(Haswell, 1920)</small> *** ''[[Syllis pectinans]]'' <small>(Haswell, 1920)</small> *** ''[[Syllis picta]]'' <small>(Kinberg, 1866)</small> *** ''[[Syllis pigmentata]]'' <small>(Chamberlin, 1919)</small> *** ''[[Syllis pilosa]]'' <small>(Aguado, San Martín & Nishi, 2008)</small> *** ''[[Syllis pontxioi]]'' <small>(San Martín & López, 2000)</small> *** ''[[Syllis profunda]]'' <small>(Cognetti, 1955)</small> *** ''[[Syllis prolifera]]'' <small>(Krohn, 1852)</small> *** ''[[Syllis prolixa]]'' <small>(Ehlers, 1901)</small> *** ''[[Syllis pseudoarmillaris]]'' <small>(Nogueira & San Martín, 2002)</small> *** ''[[Syllis pulvinata]]'' <small>(Langerhans, 1881)</small> *** ''[[Syllis quadrifasciata]]'' <small>(Fischli, 1900)</small> *** ''[[Syllis quaternaria]]'' <small>(Moore, 1906)</small> *** ''[[Syllis ramosa]]'' <small>(McIntosh, 1879)</small> *** ''[[Syllis riojai]]'' <small>(San Martín, 1990)</small> *** ''[[Syllis robertianae]]'' <small>(McIntosh, 1885)</small> *** ''[[Syllis rosea]]'' <small>(Langerhans, 1879)</small> *** ''[[Syllis rubicunda]]'' <small>(Aguado, San Martín & Nishi, 2008)</small> *** ''[[Syllis rudolphi]]'' <small>(Delle Chiaje, 1841)</small> *** ''[[Syllis schulzi]]'' <small>(Hartmann-Schröder, 1960)</small> *** ''[[Syllis sclerolaema]]'' <small>(Ehlers, 1901)</small> *** ''[[Syllis setoensis]]'' <small>(Imajima, 1966)</small> *** ''[[Syllis sol]]'' <small>(San Martín, 2004)</small> *** ''[[Syllis stenura]]'' <small>(Blanchard in Gay, 1849)</small> *** ''[[Syllis tamarae]]'' <small>(Álvarez-Campos & Verdes, 2017)</small> *** ''[[Syllis tiedemanni]]'' <small>(Delle Chiaje, 1841)</small> *** ''[[Syllis torquata]]'' <small>(Marion & Bobretzky, 1875)</small> *** ''[[Syllis tripantu]]'' <small>(Álvarez-Campos & Verdes, 2017)</small> *** ''[[Syllis truncata]]'' <small>(Haswell, 1920)</small> *** ''[[Syllis tyrrhena]]'' <small>(Licher & Kuper, 1998)</small> *** ''[[Syllis umbricolor]]'' <small>(Grube, 1878)</small> *** ''[[Syllis unzima]]'' <small>(Simon, San Martín & Robinson, 2014)</small> *** ''[[Syllis valida]]'' <small>(Grube, 1857)</small> *** ''[[Syllis variegata]]'' <small>(Grube, 1860)</small> *** ''[[Syllis villenai]]'' <small>(Aguado, San Martín & ten Hove, 2008)</small> *** ''[[Syllis violacea]]'' <small>(Grube, 1870)</small> *** ''[[Syllis vittata]]'' <small>(Grube, 1840)</small> *** ''[[Syllis vivipara]]'' <small>(Krohn, 1869)</small> *** ''[[Syllis warrnamboolensis]]'' <small>(Hartmann-Schröder, 1987)</small> *** ''[[Syllis westheidei]]'' <small>(San Martín, 1984)</small> *** ''[[Syllis yallingupensis]]'' <small>(Hartmann-Schröder, 1982)</small> *** ''[[Syllis ypsiloides]]'' <small>(Aguado, San Martín & ten Hove, 2008)</small> ** ''[[Ramisyllis]]'' *** ''[[Ramisyllis multicaudata]]'' <small>(Glasby, Schroeder & Aguado, 2012)</small> *** ''[[Ramisyllis kingghidorahi]]'' <small>(M. Teresa Aguado, et al. 2022)</small>
==In Thailand== Syllid worms are commonly referred to in [[Thai language|Thai]] as ''tua roi khā'' ({{langx|th|ตัวร้อยขา}}, {{lit|hundred-legged creatures}}) or ''tua Songkran'' (ตัวสงกรานต์, Songkra creatures), as they are often reported in tap water supplies around the [[Songkran]] festival period (13–15 April), which coincides with [[Geography of Thailand#Climate|Thailand's hot]] season. They are also sometimes called "rainbow creatures" due to their brightly colored, iridescent bodies resembling a rainbow. The [[Metropolitan Waterworks Authority]] has explained that their presence may be associated with leaks or defects in sections of water distribution pipelines, allowing small aquatic organisms to enter the system.
Thai zoologist [[Boonsong Lekagul]], a prominent figure in the country's zoological history, recorded an observation of a Songkran creature at a house near the Uruphong Bridge (now [[Uruphong Intersection]]) on [[Phetchaburi Road]] on 13 April 1945 at 08:00, during high tide conditions. The specimen was described as exhibiting iridescent coloration when submerged in water, measuring approximately {{convert|4.2|cm|in}} in length, with numerous ventral parapodia resembling centipede-like legs. While swimming, its body appeared to twist in a helical motion, and upon handling, it readily fragmented into multiple segments.
Syllid worms found in Bangkok's water supply systems are generally classified within the family Syllidae, whereas specimens reported in [[Chachoengsao Province|Chachoengsao]] are often associated with the family [[Nereidae]].<ref>หน้า 8 ต่อข่าวหน้า 1, ''ตัว 100 ขาไร้ซึ่งอันตราย''. "เคียงข่าว". '''[[Daily News (Thailand)|เดลินิวส์]]'''ฉบับที่ 23,768: วันอาทิตย์ที่ 9 พฤศจิกายน พ.ศ. 2557: แรม 3 ค่ำ เดือน 12 ปีมะเมีย {{in lang|th}}</ref><ref>{{cite web|url=https://www.scimath.org/article-science/item/4777-2015-09-30-04-14-45|title=ตัวร้อยขาปนมากับน้ำได้อย่างไร อันตรายหรือไม่|language=thai|first=Jiraporn|last= Pakorn|date=2015-09-30|accessdate=2026-04-23|work=SciMath}}</ref>
==References== {{Commons category}} {{Reflist}}
{{Taxonbar|from=Q2373923}} {{Authority control}}
[[Category:Syllidae| ]] [[Category:Annelid families]] [[Category:Long stubs with short prose]]
{{Annelid-stub}}