However, the number of trichobothria on that region of the patella is quite variable in the family Euscorpiidae Laurie 1896 (Soleglad & Sissom 2001), and thus the similarity between the two species currently placed in Plesiochactas could be a symplesiomorphy.
an early and explicit recognition of symplesiomorphy (shared ancestral characters).
Several authors also have noted the advantages of employing physically linked markers for distinguishing between morphological patterns resulting from hybridization and those resulting from primary intergradation, convergence, or symplesiomorphy (e.
Unfortunately, evolutionary phenomena such as symplesiomorphy, convergent evolution, and phenotypic plasticity can generate phenotypic and genetic patterns that masquerade as hybridity (Dobzhansky 1941; Barber and Jackson 1957; Heiser 1973).
The ideas of symplesiomorphy, apomorphy, and homoplasy were not features of earlier attempts at a natural system: lists of resemblances were the tool employed, and relationship was judged on the basis on numbers of similarities rather than what character states they represented.
dc 4 + c); (5) additional centralia; (6) additional postaxial distal mesopodials, including po; (7) pr; and (8) atavistic separation of amalgamated elements (a symplesiomorphy for the taxon in question; e.