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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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