Plasticity of conchological characters had led to erroneous descriptions and the accumulation of synonyms making difficult the discrimination among species. The land snail genus Megalobulimus is an example of this problem. Megalobulimus leucostoma (Sowerby. 1835) has three subspecies which are difficult to differentiate by using the original descriptions. https://www.deliandiver.com/product-category/spout-nozzle-cover/