Slide showing a table regarding species, number of families and number of genes. Slide shows a table regarding species, number of families and number of genes. The table reads as follows: Year Species No. of Families No. of Genes 1933 MEL 13 5 1933 SUB 11 3 (3) 1934 MEL 10 (1) 9 (2) 1934 SUB 16 (1) 21 (3) Late 19th to early 20th century