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Table 1 Morphological measurements (mean ± 1 standard deviation followed by the range in parentheses) of Gyrodactylus salinae n. sp. from Aphanius fasciatus (Valenciennes) collected from Cervia Saline, Italy, compared with those of Gyrodactylus rugiensoides Huyse et Volckaert, 2002 from Pomatoschistus minutus (Pallas) collected from Texel, The Netherlands (paratypes acc. nos. BMNH 2002.2.14.2-3)

From: Gyrodactylus salinae n. sp. (Platyhelminthes: Monogenea) infecting the south European toothcarp Aphanius fasciatus (Valenciennes) (Teleostei, Cyprinodontidae) from a hypersaline environment in Italy

Variable Gyrodactylus salinae n. sp.
(n = 15)
Gyrodactylus rugiensoides Huyse et Volckaert, 2002
(n = 2)
Total body length 447 ± 63.3 (375-575) 787.5 (700-875)
Total body width 116 ± 26.7 (88-163) 159 (155-162.5)
Opisthaptor length × width 75 ± 8.9 (60-88) × 80 ± 5.7 (70-88) 112.5 (110-115) × 147.5 (145-150)
Anterior pharynx bulb length × width 18.8 ± 3.1 (15.0-24.5) × 22.1 ± 2.4 (19.5-27.2) 32.9 (30.1-35.7) × 48.3 (46.8-49.7)
Posterior pharynx bulb length × width 8.1 ± 0.7 (6.6-8.8) × 24.6 ± 2.4 (21.8-29.0) 34.1 (27.7-40.5) × 78.4 (76.5-80.4)
MCO length × width 14.4 ± 2.1 (11.9-18.5) × 12.7 ± 2.7 (10.1-17.6)1 14.8 (13.6-15.9) × 15.1 (14.0-16.1)
Hamulus (H)   
H aperture 17.9 ± 0.8 (17.0-19.6) 18.0 (17.5-18.5)
H proximal shaft width 7.0 ± 0.6 (6.3-8.1) 8.1 (7.6-8.6)
H point length 24.8 ± 0.5 (23.9-25.9) 29.9 (29.3-30.5)
H distal shaft width 4.1 ± 0.4 (3.2-4.6) 5.4 (5.3-5.4)
H shaft length 31.9 ± 2.9 (28.2-37.3) 33.8 (33.5-34.2)
H inner curve length 3.8 ± 0.6 (2.3-4.6) 3.9 (3.5-4.3)
H aperture angle (°) 36.6 ± 1.2 (33.8-37.9) 32.5 (30.7-34.4)
H point curve angle (°) 12.2 ± 2.3 (7.4-15.4) 10.1 (9.4-10.7)
Inner H aperture angle (°) 41.4 ± 1.3 (39.2-43.5) 38.5 (36.4-40.7)
H root length 16.8 ± 0.9 (14.7-18.3) 19.4 (19.2-19.7)
H total length 51.7 ± 1.6 (48.7-54.6) 58.1 (57.9-58.2)
Dorsal bar (DB)   
DB total length 20.9 ± 1.7 (18.1-22.9) 25.6 (23.8-27.4)
DB width 1.9 ± 0.2 (1.6-2.2) 1.8 (1.7-1.9)
DB attachment point length 9.4 ± 0.4 (8.8-9.9) 8.7 (8.6-8.7)
Ventral bar (VB)   
VB total width 25.0 ± 1.1 (23.5-26.7) 26.2 (25.3-27.1)
VB total length 22.5 ± 1.6 (19.2-25.5) 20.4 (20.4-20.5)
VB process-to-mid length 3.0 ± 0.5 (2.1-4.0) 2.0 (1.8-2.3)
VB median length 6.2 ± 0.4 (5.6-6.8) 6.2 (5.9-6.6)
VB process length 2.9 ± 0.4 (2.1-3.5) 1.2 (1.1-1.3)
VB membrane length 13.2 ± 1.1 (10.7-15.2) 11.9 (11.8-11.9)
Marginal hook (MH)   
MH total length 26.8 ± 0.6 (25.9-27.6) 30.7 (30.7-30.8)
MH shaft length 20.8 ± 0.3 (20.2-21.5) 24.3 (24.1-24.5)
MH sickle length 6.3 ± 0.2 (6.1-6.6) 6.6 (6.3-6.9)
MH sickle proximal width 4.0 ± 0.2 (3.6-4.4) 4.3 (4.2-4.3)
MH toe length 1.8 ± 0.1 (1.6-2.0) 1.7 (1.6-1.7)
MH sickle distal width 3.6 ± 0.2 (3.3-4.0) 3.7 (3.5-3.9)
MH aperture 5.6 ± 0.2 (5.4-6.0) 5.7 (5.6-5.7)
MH instep/arch height 0.6 ± 0.1 (0.5-0.7) 0.5 (0.5-0.6)
  1. Measurements are provided in micrometres and follow those detailed in Shinn et al. [12], plus three additional measurements of the dorsal bar. Due to the limited number of G. rugiensoides specimens available for study, only the mean and range is presented.
  2. 1Based on the measurement of 5 specimens.