Task: Text Categorization
Input (English): 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.
Output (English): 10