Hook measurements from Echinorhynchus gadi spp. A, B and I Data are summarised in table 3 of the published paper (Wayland et al 2005). Comma separated value file with the following columns: 1: species 2: sex 3: specimen (unique identifier for individual acanthocephalan 4: hook_number (hook number counted from apical end of proboscis) 5: hk_position (standardised hook position expressed as percentage) 6: st_length (hook blade length) 7: c_length (length of curvature of hook blade) 8: base_width ( width of base of hook blade) 9: area (cross-sectional area of a hook viewed in profile) All measurements in micrometres, except area which is in square micrometres. N.B. Specimen C014B is a variant form of E. gadi sp. A. Reference: Wayland MT, Gibson DI, Sommerville C. Morphometric discrimination of two allozymically diagnosed sibling species of the Echinorhynchus gadi Zoega in Muller complex (Acanthocephala) in the North Sea. Syst Parasitol. 2005 Feb;60(2):139-49. PubMed PMID: 15841350.