Has bacteriolytic activity against Gram-positive bacteria. Hydrolysis of (1->4)-beta-linkages between N-acetylmuramic acid and N-acetyl-D-glucosamine residues in a peptidoglycan and between N-acetyl-D-glucosamine residues in chitodextrins. Expressed in pharyngeal gland cells and duct projections, coelomocytes and intestine. Induced by Gram-positive bacterium M.nematophilum CBX102 infection but not by Gram-negative bacterium P.aeruginosa PAO1 infection. Belongs to the glycosyl hydrolase 22 family. Type-I lysozyme subfamily.