Table 3.
Meristic data for adult specimens of two distinct karyotypic forms belonging to the Gymnotus carapo species complex from the Eastern Amazon (EA) (G. carapo 2n = 42 and G. carapo 2n = 40).
| G. carapo 2n = 42 | G. carapo 2n = 40 | G. carapo EA | ||||
| Range | Median* Mode** |
Range | Median* Mode** |
Range | Median* Mode** |
|
| BND | 19–27 (9) |
22* | 14–21 (7) |
18.5* | 21–25 (16) |
23* |
| AFR | 170–220 (3) |
196.7* | 190–225 (2) |
202.5* | 190–235 (10) |
222* |
| P1R | 13–16 (9) |
14** | 15–17 (7) |
15** | 13–15 (16) |
14** |
| SAL | 6–8 (9) |
7** | 6–8 (7) |
7** | 6–7 (16) |
7** |
| CEP | 3–4 (3) |
3** | 3–4 (3) |
3** | 3–4 (16) |
3** |
| APS | 7–9 (9) |
9** | 8–10 (7) |
9** | 7–8 (7) |
8** |
| PCV | 33 (1) |
- | 34 (1) |
- | 32–35 (9) |
33 |
| PLR | 43–51 (9) |
47* | 40–48 (7) |
45* | 41–54 (15) |
48* |
| PLL | 87–104 (4) |
93.5* | 84–89 (3) |
84 | 68–110 (15) |
77* |
| VLR | 7–9 (9) |
9** | 8–10 (7) |
9** | 0–8 (10) |
4** |
For reference we include data for EA populations of G. carapo taken from [10].
Abbreviations: BND: vertical bands; AFR: anal-fin rays; P1R: pectoral-fin rays; SAL: scale rows above lateral line; CEP: caudal electrocyte rows; APS: scale rows over anal-fin pterygiophores; PCV: pre-caudal vertebrae; PLR: pored lateral line scales to first ventral ramus of lateral line; PLL: total pored lateral line scales; VLR: ventral rami of lateral line. N values (in parentheses) vary because measurements were excluded from specimens with damage or unusual preservation artifacts. The mode and median are used as measures of central tendency following protocol for comparative studies of Gymnotus.