Molluscicidal activity of monoterpenes and their effects on inhibition of acetylcholinesterase activity on Biomphalaria glabrata, an intermediate host of Schistosoma mansoni

•Camphor and 1,8-cineole did not induce the mortality of adult B. glabrata snails.•Thymol and α-pinene are toxic to B. glabrata in concentration recommended by WHO.•Thymol and α-pinene toxicity to snails is concentration dependent.•Thymol and α-pinene are inhibitors of acetylcholinesterase of B. glabrata snails.•Low toxicity of thymol and α-pinene to non-target organisms compared to niclosamide.