Context: The Jurassic (from Jura Mountains) is a geologic period and system that spans 56.3 million years from the end of the Triassic Period million years ago (Mya) to the beginning of the Cretaceous Period Mya. The Jurassic constitutes the middle period of the Mesozoic Era, also known as the Age of Reptiles. The start of the period is marked by the major TriassicJurassic extinction event. Two other extinction events occurred during the period: the Pliensbachian/Toarcian event in the Early Jurassic, and the Tithonian event at the end; however, neither event ranks among the "Big Five" mass extinctions., Mitsukurinidae is a family of sharks with one living genus, "Mitsukurina", and five fossil genera: "Anomotodon", "Protoscapanorhynchus", "Pseudoscapanorhynchus" and "Scapanorhynchus", and "Woellsteinia", though some taxonomists consider "Scapanorhynchus" to be a synonym of "Mitsukurina". The only known living species is the goblin shark, "Mitsukurina owstoni"., The Paleogene (or ; also spelled Palaeogene or Palæogene; informally Lower Tertiary) is a geologic period and system that spans 43 million years from the end of the Cretaceous Period million years ago (Mya) to the beginning of the Neogene Period Mya. It is the beginning of the Cenozoic Era of the present Phanerozoic Eon. The Paleogene is most notable for being the time during which mammals diversified from relatively small, simple forms into a large group of diverse animals in the wake of the CretaceousPaleogene extinction event that ended the preceding Cretaceous Period. , The Cretaceous is a geologic period and system that spans 79 million years from the end of the Jurassic Period million years ago (Mya) to the beginning of the Paleogene Period Mya. It is the last period of the Mesozoic Era. The Cretaceous Period is usually abbreviated K, for its German translation "Kreide" (chalk)., In cryptography, SHARK is a block cipher identified as one of the predecessors of Rijndael (the Advanced Encryption Standard)., Scapanorhynchus ( `` Spade Snout '' ) is an extinct genus of shark from the Cretaceous period . Their extreme similarities to the living goblin shark , Mitsukurina owstoni , lead some experts to consider reclassifying it as Scapanorhynchus owstoni . However , most shark specialists regard the goblin shark to be distinct enough from its prehistoric relatives to merit placement in its own genus . Scapanorhynchus had an elongated , albeit flattened snout and sharp awl - shaped teeth ideal for seizing fish , or tearing chunks of flesh from its prey . It was a small shark normally measuring about 65 cm , though the largest species , S. texanus , is thought to have reached up to 3 m ( 10 ft ) in length , about the size of a modern goblin shark ., The goblin shark ("Mitsukurina owstoni") is a rare species of deep-sea shark. Sometimes called a "living fossil", it is the only extant representative of the family Mitsukurinidae, a lineage some 125 million years old. This pink-skinned animal has a distinctive profile with an elongated, flattened snout, and highly protrusible jaws containing prominent nail-like teeth. It is usually between long when mature, though it can grow considerably larger. Goblin sharks inhabit upper continental slopes, submarine canyons, and seamounts throughout the world at depths greater than , with adults found deeper than juveniles., Subject: scapanorhynchus, Relation: parent_taxon, Options: (A) mitsukurinidae (B) mya (C) neogene (D) shark
Output: mitsukurinidae