Table 3
Morphological differences between the morphometry of Creptotrema creptotrema and Creptotrema lynchi. Measurements are in micrometers.
| C. creptotrema (Travassos et al., 1928): original description | C. creptotrema (Kohn, 1984): redescription | C. creptotrema** (present study): adult in early development phase | C. creptotrema** (present study): completely developed adult | C. lynchi (Brooks, 1976): original description | C. lynchi (Kohn et al., 1985): reported in Brazilian fishes | |
|---|---|---|---|---|---|---|
| Body length | 470–540 | 466–622 | 435–824 | 1120–1405 | 850–1490 | 980–1590 |
| Body width | 240–280 | 240–390 | 283–379 | 513–663 | 390-670 | 570–680 |
| Oral sucker | 110–130* | 100–132 × 126–172 | 83–132 × 96–172 | 141–206 × 175–194 | 156–276 × 192–336 | 150–180 × 180–210 |
| Pharynx | 40* | 36–60 × 38–72 | 26–60 × 33–59 | 67–82 × 68–93 | 60-84 × 120 | 60–90* |
| Esophagus | Short | Short | Short | Long | Long | Long |
| Ventral sucker | 160* | 156–198 × 156–210 | 120–249 × 124–235 | 232–278 × 223–305 | 264–396 × 276–372 | 210–270 × 240–270 |
| Cirrus-sac | Large; on acetabular region | 132–204 × 36–42 | 148–156 × 29–73 | 258–420 × 49–79 | 444–660 × 80–108 | 240–270 × 40–60 |
| Ovary | Round; pre-testicular; post-acetabular | 48–84 × 36–66 | 87–114 × 82–90 | 151–181 × 119–182 | 204–264 × 216–288 | 130–190 × 130–210 |
| Uterus | Pre-testicular, intercecal/Eggs between testis and genital pore | Pre-testicular, mainly intercecal/Eggs may occur in testicular region | Pre-testicular, mainly intercecal/Eggs may occur in testicular region | Mainly intercecal/Eggs may extend beyond the testis region | Pre-testicular/testicular, intercecal (may extend extracecally) | Mainly intercecal/Eggs may extend beyond the testis region |
| Left testis | 56–96* | 72–120 × 48–105 | 106–121 × 73–91 | 125–184 × 89–143 | 300–480 × 192–252 | 200–270 × 100–170 |
| Right testis | – | 72–132 × 48–92 | 94–121 × 89–90 | 153–182 × 89–111 | 325–540 × 180–265 | 210–350 × 100–150 |
| Eggs | 72–78 × 44–50 | 60–72 × 38–50 | 62–75 × 31–45 | 55–80 × 31–43 | 55–67 × 35–38 | 64–79 × 34–45 |
| Number of eggs | 4–5 | 2–5 | Less than 10 eggs | More than 10 eggs | More than 10 eggs | More than 10 eggs |
Measurements of the diameter. The adult in the early development phase and completely developed adult forms of Creptotrema creptotrema from this study were recovered from a single host, and specimens showing both morphologies were sequenced and used in the 28S rDNA and COI mtDNA analyses; there was no intraspecific genetic divergence between these morphotypes.
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