Evolution of the Ludlow (Silurian) graptolite genus Bohemograptus Pribyl 1936

The characteristic and long-ranging Ludlow graptoloid Bohemograptus Pribyl, 1967 is considered to have originated from Lobograptus progenitor cudalens is through B. urbaneki or Monograptus idoneus Koren', 1992. The Bohemograpt us stem lineage gave rise to B. b. tenuis as a temporal subspecies near the base of the Ludfordian Stage; there followed immediately a considerable di versification into a number of Bohemograptus species (B. praecornutus Urban ek. 1970. B. cornutus Urbanek, 1970, B. n. spp. A. & B. Rickards & Wright, in press); and several genera (Korenea, Rickards et al., 1995; Polonograptu s Tsegelnuk, 1976; Egregiograptus Rickards & Wright, 1997a; Neolobograptus Urbanek, 1970; and Neocucullograptus Urbanek, 1970. The bizarre gracile spe cies Monograptus proegregius Urbanek, 1970 is made the type species of a mo notypic new genus, Urbanekia, derived in the parascanicus Biozone from an u nknown lobograptid; and Lenzia lenzi gen. et sp, nov. is established for cl adia-bearing neolobograptids. Egregiogratus pribyli sp. nov. is described. Bohemograptus n. spp. A & B are interpreted as examples of heraldic evoluti on.