A new species of Ophionyssus Mégnin (Acari: Mesostigmata: Macronyssidae) parasitic on Lacerta schreiberi Bedriaga (Reptilia: Lacertidae) from the Iberian Peninsula, and a world key to species Author Moraza, María L. Author Irwin, Nancy R. Author Godinho, Raquel Author Baird, Stuart J. E. Author Bellocq, Joëlle Goüy De text Zootaxa 2009 2007 58 68 journal article 10.5281/zenodo.185725 b87d87a0-a70f-4b42-883d-36406816b888 1175-5326 185725 Key to males of Ophionyssus 1. Holoventral shield present with 13 pairs of setae plus post-anal seta; femur III with ventral spur; dorsal shield with 44 pairs of setae............................................................................................................................................................. 2 - Holoventral shield absent; sternogenital with 2–3 pairs of setae; femur III ventral spur present or absent............... 3 2. Genu IV, seta pl -2 present; peritremes extend to anterior half of coxae II; holoventral shield 490 long; dorsal shield 605 long, 345 wide....................................................................................................................................... O . galeotes - Genu IV, seta pl -2 absent; peritremes extend to just beyond posterior margins of coxae II; holoventral shield 490–535 long; dorsal shield 600–635 long, 385–405 wide ..................................................................... O . scincorum 3. Femur III ventral spur present ...................................................................................................................................... 4 - Femur III ventral spur absent........................................................................................................................................ 6 4. Dorsal shield with 17–19 pairs of setae; shield 689 long, 254 wide; 11–13 pairs of dorsal setae on soft cuticle; peritremes extend to anterior third of coxae III; 7–8 pairs of ventral setae; femur III ventral spur thumb-like in shape..... ........................................................................................................................................................... O . schreibericolus - Dorsal shield with 24 pairs of setae; peritremes extend to anterior margin of coxae III; 9–10 pairs of ventral setae on soft cuticle; femur III with strong curved spur ............................................................................................................. 5 5. Sternogenital shield 186 long; anal shield 78 x 45 ; dorsal shield 460 long, 255 wide; 7–8 pairs of ventral setae ........ ................................................................................................................................................................ O . galloticolus - Sternogenital shield 195 long; anal shield 84 x 50 ; dorsal shield 485 long, 290 wide.................................. O . setosus 6. Sternogenital shield with 2 pairs of setae ( st1 , st2 ) ..................................................................................................... 7 - Sternogenital shield with 3 pairs of setae ( st1-st3 ) ..................................................................................................... 10 7. Dorsal shield with 13–14 pairs of setae, 412 long, 255 wide; peritremes extend to posterior half of coxae III; 6–7 pairs of ventral setae; tarsus II–IV with ventral setae inflated basally and set on slight prominences........................... ........................................................................................................................................................ O . arnhemlandensis - Dorsal shield with more than 14 pairs of setae; tarsus II–IV without ventral setae inflated basally and set on slight prominences .................................................................................................................................................................. 8 8. Femur III and sometimes IV with spine-like or spur-like ventral setae ....................................................................... 9 - Femur III and IV without modified ventral setae; dorsal shield with 17 pairs of setae; shield 204 long, 240 wide; peritremes extend to anterior border of coxae III; at least 11 pairs of ventral setae ........................................... O . natricis