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This enzyme belongs to the family of hydrolases, specifically those glycosidases that hydrolyse O- and S-glycosyl compounds. The systematic name of this enzyme class is 1,6-alpha-mannosyl alpha-D-mannohydrolase.
References
Athanasopoulos VI, Niranjan K, Rastall RA (2005). "The production, purification and characterisation of two novel alpha-D-mannosidases from Aspergillus phoenicis". Carbohydr. Res. 340 (4): 609–17. doi:10.1016/j.carres.2005.01.005. PMID15721331.