Task: Question Answering
Input (English): Context: Thysanoessa is a genus of krill , containing the following species : Thysanoessa gregaria G. O. Sars , 1885 Thysanoessa inermis ( Krøyer , 1846 ) Thysanoessa inspinata Nemoto , 1963 Thysanoessa longicaudata ( Krøyer , 1846 ) Thysanoessa longipes Brandt , 1851 Thysanoessa macrura G. O. Sars , 1885 Thysanoessa parva Hansen , 1905 Thysanoessa raschii ( M. Sars , 1864 ) Thysanoessa spinifera Holmes , 1900 Thysanoessa vicina Hansen , 1911, Euphausia is the largest genus of krill, and is placed in the family Euphausiidae. There are 31 species known in this genus, including Antarctic krill ("Euphausia superba") and ice krill ("Euphausia crystallorophias") from the Southern Ocean, and North Pacific krill ("Euphausia pacifica") in the Pacific Ocean., Krill are small crustaceans of the order Euphausiacea, and are found in all the world's oceans. The name "krill" comes from the Norwegian word "", meaning "small fry of fish", which is also often attributed to species of fish., A fish is any member of a group of organisms that consist of all gill-bearing aquatic craniate animals that lack limbs with digits. They form a sister group to the tunicates, together forming the olfactores. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish as well as various extinct related groups. Tetrapods emerged within lobe-finned fishes, so cladistically they are fish as well. However, traditionally fish are rendered obsolete or paraphyletic by excluding the tetrapods (i.e., the amphibians, reptiles, birds and mammals which all descended from within the same ancestry). Because in this manner the term "fish" is defined negatively as a paraphyletic group, it is not considered a formal taxonomic grouping in systematic biology. The traditional term pisces (also ichthyes) is considered a typological, but not a phylogenetic classification., Subject: thysanoessa, Relation: parent_taxon, Options: (A) euphausia (B) euphausiidae (C) hagfish (D) olfactores
Output (English): euphausiidae