Our work is based on the debugging process of real ontologies that have been developed by domain experts, who are not necessarily too familiar with DL, and hence can misuse DL constructors and misunderstand the semantics of some OWL expressions, leading to unwanted unsatisfiable classes. Our patterns were first found during the debugging process of a medium-sized OWL ontology (165 classes) developed by a domain expert in the area of hydrology. We have identified a set of patterns that are commonly used by domain experts in their DL formalisations and OWL implementations, and that normally result in unsatisfiable classes or modelling errors. Thus they are antipatterns. We also have made an effort to identify common alternatives for providing solutions to them, so that they can be used by domain experts to debug their ontologies