Figure 7. Major karyotypes of the grammicus complex. A. standard grammicus ♂; B. P1 grammicus ♀; C. F6 grammicus ♀; D. F5 grammicus ♀; E. F5+6 grammicus ♀; F. FM1 grammicus ♂; G. FM2 grammicus ♀. Locality information for this figure is unavailable; however. Hall and Selander (1973 Figs. 2 and 3a) map the distribution of each karyotype pattern shown here. Chromosomes which differ from the primitive or "standard" condition for all crevice-users are enclosed in boxes. If the condition is fixed, the border is solid; and if it is polymorphic, the border is dashed. The bar between rows 3 and 4 represents 10 µm. Note that the fission of pair 3 is present at a low frequency in the FM1 population, although I do not have adequate mitotic material from the 2 heterozygous individuals in my collection. The major sequence of karyotypic derivation goes from S (column A) to P6 (column C) to F5+6 (column E) to FM1 (column F) to FM2 (column G). The F5 population (column D) is an independent branch from S. Based on biogeography and morphology, P1 (column B) appears to be derived from F6, although it is karyotypically more similar to S (column A).