Table 2
Measurements of Hexostoma thynni (μm), designated under the name Hexostoma thynni or Plagiopeltis duplicata. We consider that specimens described by Parona & Perugia (1892) and Palombi (1943) correspond to H. thynni, such as our own specimens, but that the specimens measured by Lopez-Roman & De Armas Hernandez (1989), which are much larger, probably correspond to another species.
| Name used | Hexostoma thynni | Plagiopeltis duplicata | Hexostoma thynni | Hexostoma thynni |
|---|---|---|---|---|
| Hosts | Thunnus thynnus | Thunnus thynnus | Thunnus thynnus, Sarda sarda | Thunnus obesus, Thunnus thynnus |
| Source | Present study | Parona & Perugia (1892) [50] | Palombi (1943) [47] | Lopez-Roman & De Armas Hernandez (1989) [40] |
| Localities | Off Algeria, Mediterranean | Off Italy, Mediterranean | Off Italy, Mediterranean | Off Canary Islands, Atlantic Ocean |
| Number of specimens | 10 | ? | ? | 35 |
| Body length | 14080 (12000–15000) | 14000–16000 | 14000–16000 | 19120–31530 |
| Body width | 2750 (2000–4000) | 4240–7520 | ||
| Haptor length | 4300 (3000–6000) | 3100–6700 | ||
| Haptor width | 3300 (2000–5000) | 6000 | ||
| Clamps, length × width | 1st pair: 532 (456–626) × 430 (340–522) | External clamps: 500–700 | Anterior clamps: 700 × 500 | Large clamps: 500–1000 × 360–660 |
| 2nd pair: 572 (488–674) × 428 (392–455) | ||||
| 3rd pair: 534 (453–591) × 467 (414–565) | ||||
| 4th pair: 211 (164–266) × 149 (111–173) | Small clamps: 320 × 190 | Posterior clamps: 320 × 190 | Small clamps: 218–473 × 146–318 | |
| Marginal and × sclerite of 1st clamp | 120 (93–149), 238 (217–275) | |||
| Marginal and × sclerite of 2nd clamp | 141 (112–164), 248 (232–284) | |||
| Marginal and × sclerite of 3nd clamp | 138 (107–161), 234 (215–249) | |||
| Marginal and × sclerite of 4th clamp | 65 (59–77), 96 (77–111) | |||
| Posterior anchor | 24 (23–25) | 23 | 25 | 18–29 |
| Anterior anchor | 88 (59–103) | 91 | 100 | 70–122 |
| Buccal organ, length × width | 41 (34–47) × 28 (25–31) | 90 × 45 | ||
| Pharynx, length × width | 73 (69–76) × 51 (46–54) | |||
| Genital atrium to anterior extremity | 1466 (1040–1671) | |||
| Genital atrium length | 249 (196–308) | |||
| Genital atrium width | 147 (119–175) | |||
| Number of testes | 71 (64–75) | 86–112 | ||
| Vagina to anterior extremity distance | 2040 (1584–2426) | |||
| Vaginal sclerite, length × width | 197 (172–281) × 137 (127–150) | Length 160–230 | 200 (length) | 130–300 × 109–273 |
| Egg, length × width | 269 (228-390) × 147 (100–265) | 229 × 120 | 230 × 120 | |
| Egg filament length | 239 (179–297) | 15 |
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