Tales of the crown: An integrative approach to the testate amoeba Galeripora dentata (Ehrenberg, 1830) Siemensma, 2021 (Amoebozoa, Arcellinida, Arcellidae)

Species delimitation in unicellular organisms remains a significant challenge, primarily due to the limited number of taxonomically informative traits and their often adaptive nature. Moreover, most original descriptions of testate amoebae, dating from the late 19th to mid-20th century, relied solely on light microscopy, were often accompanied by inadequate diagnoses, and lacked illustrative drawings. To address the limitations of the historic phenetic classification, modern approaches are needed to resolve fundamental questions concerning true biodiversity and phylogenetic relationships. In this study, I employed an integrative framework that combines ecological data, morphological data (light and scanning electron microscopy), and biometric measurements to investigate the testate amoeba Galeripora dentata (Ehrenberg, 1830) Siemensma, 2021 from Bulgaria. I provide an improved diagnosis of the species, along with a synthesis of its global geographical distribution and ecological preferences.