''Ramisyllis kingghidorahi'' is a

species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...

polychaete Polychaeta () is a paraphyletic class (biology), class of generally marine invertebrate, marine annelid worms, common name, commonly called bristle worms or polychaetes (). Each body segment has a pair of fleshy protrusions called parapodia that ...

worm in the

family Family (from la, familia) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its ...

Syllidae Syllidae is a family of small to medium-sized polychaete worms. Syllids are distinguished from other polychaetes by the presence of a muscular region of the anterior digestive tract known as the ''proventricle''. Syllid worms range in size from ...

. The species lives in the

Sea of Japan The Sea of Japan is the marginal sea between the Japanese archipelago, Sakhalin, the Korean Peninsula, and the mainland of the Russian Far East. The Japanese archipelago separates the sea from the Pacific Ocean. Like the Mediterranean Sea, it h ...

off

Sado Island is a city located on in Niigata Prefecture, Japan. Since 2004, the city has comprised the entire island, although not all of its total area is urbanized. Sado is the sixth largest island of Japan in area following the four main islands and Ok ...

Japan Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north ...

, where the

holotype A holotype is a single physical example (or illustration) of an organism, known to have been used when the species (or lower-ranked taxon) was formally described. It is either the single such physical example (or illustration) or one of several ...

was found living within the internal canals of a sponge of the genus '' Petrosia''.

Description

''R. kingghidorahi'' is a member of the “Ribbon clade” Syllinae, possessing a segmented cylindrical body that exhibits multiaxial branching that is described as "dendritic" or "tree-like". The first branch occurs after segments 14–24. All branches are similar diameter.

Discovery

On 1 October 2019, an international team of

marine biologists Marine biology is the scientific study of the biology of marine life, organisms in the sea. Given that in biology many phyla, families and genera have some species that live in the sea and others that live on land, marine biology classifie ...

sampled Petrosia

sponges Sponges, the members of the phylum Porifera (; meaning 'pore bearer'), are a basal animal clade as a sister of the diploblasts. They are multicellular organisms that have bodies full of pores and channels allowing water to circulate through ...

in the

sea The sea, connected as the world ocean or simply the ocean, is the body of salty water that covers approximately 71% of the Earth's surface. The word sea is also used to denote second-order sections of the sea, such as the Mediterranean Sea, ...

near Shukunegi Point, at the southern tip of

Dissection Dissection (from Latin ' "to cut to pieces"; also called anatomization) is the dismembering of the body of a deceased animal or plant to study its anatomical structure. Autopsy is used in pathology and forensic medicine to determine the cause o ...

and analysis of the sponges yielded samples of the simbiont worm ''Ramisyllis kingghidorahi'', which were preserved in an ethanol solution for further study. ''R. kingghidorahi'' is the third known species of

syllid Syllidae is a Family (biology), family of small to medium-sized polychaete worms. Syllids are distinguished from other polychaetes by the presence of a muscular region of the anterior digestive tract known as the ''proventricle''. Syllid worms ...

worm to exhibit

asymmetrical Asymmetry is the absence of, or a violation of, symmetry (the property of an object being invariant to a transformation, such as reflection). Symmetry is an important property of both physical and abstract systems and it may be displayed in pre ...

branching of the body.

Etymology

The species is named after

King Ghidorah is a fictional monster, or ''kaiju'', which first appeared in Ishirō Honda's 1964 film ''Ghidorah, the Three-Headed Monster''. Although the name of the character is officially trademarked by Toho as "King Ghidorah", the character was originall ...

, the winged, three-headed, two-tailed

antagonist An antagonist is a character in a story who is presented as the chief foe of the protagonist. Etymology The English word antagonist comes from the Greek ἀνταγωνιστής – ''antagonistēs'', "opponent, competitor, villain, enemy, riv ...

Godzilla is a fictional monster, or '' kaiju'', originating from a series of Japanese films. The character first appeared in the 1954 film ''Godzilla'' and became a worldwide pop culture icon, appearing in various media, including 32 films produc ...

. The

character was created by

Tomoyuki Tanaka was a Japanese film producer. He is best known for co-creating the ''Godzilla'' franchise and its associated spin-offs. Early life Tanaka was born on April 26, 1910, in Kashiwara, Osaka. As a child, he would often walk miles to the nearest th ...

, inspired by Japanese mythology and folklore.

References

{{Taxonbar, from=Q110635857 Syllidae Animals described in 2022

Description

Discovery

Etymology

See also

References