Fig. 2

Two specimens of Cycleryon elongatus (Münster 1839) from the Solnhofen Lithographic Limestones (Late Jurassic, Southern Germany), part of the private collection of Matthias Wulf, Rödelsee (Germany). Scale bars 2 mm. a Composite orange-green-fluorescence image of a specimen of a “Knebelia schuberti” stage, i.e., earlier developmental stage. It exhibits an almost circular cephalothoracic shield and, compared to the older instar depicted in b, relatively long first pereiopods. Specimen found near Eichstätt. b Composite image under normal light, inverted for better comparability, of a specimen of a later developmental stage. It has relatively shorter first pereiopods than the earlier ontogenetic stage shown in a. The cephalothoracic shield is more hexagonal and the pleon a bit larger than on the younger specimen. Specimen found near Zandt, collection number 9915. cs cephalothoracic shield, pl pleon, prp pereiopods