The objective of this study was to identify the presence of morphotypes L. bulla strains from Quintana Roo, México and their life history traits. Our results indicated that L. bulla has two morphotypes: large morphotype and small morphotype. The large presented short life expectancy, intrinsic positive growth, short generational time and low number of descendants, that reach sexual maturation in an accelerated manner, while in the small the opposite occurred. In conclusion, this study indicates the possible coexistence in the same geographical bioregion of two different morphotypes of L. bulla, one is a small-sized distributed in the northwest of Quintana Roo and another large-sized in the southwest.