Definition: In this task, you are given a text which is the body of a document. Your job is to classify the topic of the document into these categories: 1)Company, 2)Educational Institution, 3)Artist, 4)Athlete, 5)Office Holder, 6)Mean of transportation, 7)Building, 8)Natural place, 9)Village, 10)Animal, 11)Plant, 12)Album, 13)Film, 14)Written work. Your output should be the category number. Don't generate anything apart from numbers 1-14.
Input: Text:  Cheloniellida is an unranked taxon (usually referred to as a class or order) of extinct Paleozoic arthropods currently (Dunlop & Selden 1997; Dunlop 2002) thought to be a member of the Arachnomorpha and related to the Chelicerata and the Trilobita while not included in any of those. There are six included genera dating from Ordovician Silurian and Devonian.

10