Egg and acanthor measurements for E. gadi sp. A (North Sea), E. gadi sp. B (North Sea) and E. gadi sp. I (Baltic Sea). All measurements are in micrometres. Comma separated value (csv) file with the following columns: 1: Species (a, sp. A; b, sp. B; I, sp. I) 2: Specimen (unique identifier for acanthocephalan) 3. Egg length 4. Acanthor length 5. Egg width 6. Acanthor width Data are summarised in table 3 of the published paper (Wayland et al, 2005). 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.