FIGURE 4. Additional xiphosurids with genal spine indentations. Arrows indicate the structure on all taxa. A: Franconiolimulus pochankei from the Bayreuth Formation, (Early Jurassic, Hettangian) Pechgraben, Germany. SSN 8PG35, holotype. B, C: Panduralimulus babcocki from the Maybelle Limestone, Lueders Formation (Permian, Cisuralian, Kungurian), Texas, USA. B: USNM 520723, holotype. C: USNM 520724, paratype. D: Tasmaniolimulus patersoni from the Jackey Shale (Permian, Lopingian), Tasmania, Australia. UTGD 123979, holotype. E: Dubbolimulus peetae from the Ballimore Formation (Middle Triassic, Ladinian), New South Wales, Australia. MMF 27693, holotype. D coated in ammonium chloride sublimate. D and E converted to greyscale. Image credit: A: Andreas Hecker; B–D: Russell Bicknell; E: David Barnes.

Published as part of Bicknell, Russell D.C., Žalohar, Jure, Miklavc, Primož, Celarc, Bogomir, Križnar, Matija & Hitij, Tomaž, 2021, Revisiting horseshoe crab fossils from the Middle Triassic (Anisian) Strelovec Formation Konservat-Lagerstätte of Slovenia, pp. 1-15 in Palaeontologia Electronica (a36) 24 (3) on page 7, DOI: 10.26879/1168, http://zenodo.org/record/12709237