The ichnotaxon Chimaerotheca schernfeldensis nov. isp. is established here for holocephalian egg cases from the Plattenkalk (Altmühltal Formation, Tithonian, Late Jurassic) of the Solnhofen/Eichstätt area of southern Germany, including the first ever double case of a holocephalian described from the fossil record. The egg capsules measure up to 400 mm in length and have a short beak but a very long pedicle; the ratio of capsule length to maximum width is 5.1:1, the largest of any
chimaeroid egg case described so far. The moderately well-developed lateral webs are supported by branched and unbranched costae and are confined to the beak, trunk and upper pedicle areas of the case. The egg cases belong to the Rhinochimaera- type ichnospecies group and were probably produced by Ischyodus quenstedti, at around 1.5 m in length the largest of the Plattenkalk chimaeroids.