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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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