Cyclotosaurus buechneri sp. nov.

Figures 2, 3

LSID urn:lsid:zoobank.org:act: BEA3C090-24EC-4E39- BE5D-74898812C1A0. Date of registration: 20 March 2016 .

2000 Cyclotosaurus robustus . – Schoch and Milner, p. 154.

2008a Cyclotosaurus robustus . – Büchner, p. 134, fig.

2008b Cyclotosaurus robustus . – Büchner, fig. 8.

2013 Amphibienschädel (amphibian skull). – Büchner, fig. 3.03–6.

Derivation of name: In honor of Dr. Martin Büchner, former director of the Museum of Natural History in Bielefeld. Martin Büchner discovered the holotype and only known specimen in 1975, and has a life-long record of outstanding contributions to the museum’s geological collection and the popularization of geosciences in the region .

Holotype and only specimen: Namu ES/k 36053, an almost complete cranium in dorsal view, embedded in sandstone with the palate and occiput obscured.

Type locality and horizon: Bielefeld, district Sieker, North Rhine-Westphalia, northwestern Germany; Stuttgart Formation, middle Carnian, Late Triassic.

Diagnosis: A species within Cyclotosaurus with the following unique combination of characters: (1) orbitae medially placed with short interorbital distance (shared with C. robustus); (2) region lateral to orbitae only slightly wider than width of orbitae (shared with C. posthumus, C. ebrachensis, C. intermedius, and C. mordax); (3) postorbital skull region slender (shared with C. ebrachensis); (4) preorbital projection of jugal shorter than half the length of snout (shared with C. mordax, C. ebrachensis, C. intermedius, C. posthumus, and C. hemprichi, but dissimilar to C. robustus).