Slugs are an important pest due to the wide range of crops that they are able to attack. Lately, they have been registe red as an important pest in alstroemeria crop, where they leed with the tender buds arthe plant base, avoiding new productive stems development and causing yield decreases. Due to the lack of knowledge about those molluscs and the high soil moisture and low light conditions into alstroemeria crop that enhance slugs development as a pest, this research was done. This work that was carried out in Jardines de Colombia Ltda (Madrid-Cundinamarca) under laboratory and comercial greeenhouse conditions includes taxonomic determination and lile cycle study of the predominant slug group. Also, lour other groups that are present in the same crop were taxonomically determined. Results show that egg has an incubation time 01 17.17 days under laboratory and 21.7 days under greenhouse conditions. Slug lile cycle has a 124.5 and 123.9 days duration, respectively. Samples of each slug group sended to specialists, be long to Limacidae and Arionidae lamilies, and Deroceras and Limax genera were present in Limacidae lamily. Genera in Arionidae lamily weren't determined.