Table 3.
Parsimony analysis on the four datasets produced trees with minimal length and homoplasy values as indicated.
| data | Bremer support (no. nodes) | no. terminals | variable positions | no. steps | CI | RI | |||
|---|---|---|---|---|---|---|---|---|---|
| total | tips | sub-cluster | basal | ||||||
| water beetles | |||||||||
| cox1 | 284 | 17 (41) | 249 (14) | 18 (20) | 77 | 255 | 1155 | 35 | 85 |
| 28S | 62 | 0 (32) | 28 (14) | 34 (16) | 63 | 157 | 332 | 76 | 93 |
| Canthon (all terminals) | |||||||||
| cox1 | 296 | 13 (39) | 240 (10) | 42 (10) | 61 | 287 | 705 | 52 | 88 |
| 28S | 24 | 0 (39) | 17 (10) | 7 (10) | 62 | 34 | 66 | 68 | 94 |
| cox1+28S | 92 | 7 (48) | 68 (10) | 17 (10) | 71 | 321 | 784 | 53 | 89 |
| Canthon (core terminals) | |||||||||
| cox1 | 260 | 10 (27) | 214 (10) | 36 (11) | 50 | 284 | 695 | 52 | 85 |
| 28S | 24 | 0 (27) | 16 (10) | 8 (11) | 50 | 34 | 66 | 68 | 94 |
| cox1+28S | 277 | 12 (27) | 224 (10) | 41 (11) | 50 | 318 | 774 | 53 | 86 |
Bremer Support was calculated for three categories of nodes, corresponding to those near the tips within a cluster (tips), the nodes immediately below a cluster (sub-cluster) and the nodes defining basal relationships between the clusters (basal). The number given is the sum of the nodal Bremer Support values for this category in the entire tree, and numbers in parentheses give the number of nodes assigned to each category (many of them collapsed near the tips because sequences are identical or very similar). Total Bremer Support refers to the sum of the values for the entire tree. For Canthon, a combined analysis of cox1 and 28S datasets was conducted, either combining all terminals in a single ‘supermatrix’ (all terminals), or removing all terminals which were not complete for either one of the two gene partitions (core terminals, n=50).