Q:Information:  - 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.  - Thysanopoda is a genus of krill , containing the following species : Thysanopoda acutifrons Holt & Tattersall , 1905 Thysanopoda aequalis Hansen , 1905 Thysanopoda astylata Brinton , 1975 Thysanopoda cornuta Illig , 1905 Thysanopoda cristata G. O. Sars , 1883 Thysanopoda egregia Hansen , 1905 Thysanopoda microphthalma G. O. Sars , 1885 Thysanopoda minyops Brinton , 1987 Thysanopoda monacantha Ortmann , 1893 Thysanopoda obtusifrons G. O. Sars , 1883 Thysanopoda orientalis Hansen , 1910 Thysanopoda pectinata Ortmann , 1893 Thysanopoda spinicaudata Brinton , 1953 Thysanopoda tricuspidata Milne - Edwards , 1837  - 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.    After reading the paragraphs above, we are interested in knowing the entity with which 'thysanopoda' exhibits the relationship of 'parent taxon'. Find the answer from the choices below.  Choices: - euphausia  - euphausiidae  - hagfish  - olfactores
A:
euphausiidae