“…The high degree of body size disparity in extant sturgeons (Rabosky et al, 2013) contrasts with their status as a living fossil lineage, i.e., a long-lived, species-poor clade that shows little phenotypic change from ancient fossil relatives (Gardiner, 1984; Grande and Bemis, 1991; Bemis et al, 1997; Hilton et al, 2011). A similar pattern of proportionally high variation in body size relative to species diversity has also been documented in latimeroid coelacanths, which include the freshwater-brackish clade †Mawsoniidae (Cavin et al, 2021).…”