“…In this sense, it is possible that the evaluation of the internal morphological differences of the different lineages or physiological varieties of S. scabiei is a key tool for their separation. For example, several studies have evaluated the morphological differences of the reproductive systems and germ cells in adult ticks as an effective tool for the separation of species complexes ( Sampieri et al, 2014 , 2016 ; Rivera-Páez et al, 2017 ; Ospina-Pérez et al, 2020 ), but there are very few studies about the internal morphology of S. scabiei , so it is difficult to carry out comparative analyzes that allow separating the different existing lineages ( Desch 2001 ; Kristjansson et al, 2007 ; Witaliński 2014 ; Teodoro et al, 2018 ). In this sense, the present study contributes with descriptions and histological micrographs of the different stages of the biological cycle of S. scabiei within the skin of C. quichua ( Fig.…”